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nuttx/fs/procfs/fs_procfsproc.c
Xiang Xiao 6a3c2aded6 Fix wait loop and void cast (#24) 
* Simplify EINTR/ECANCEL error handling

1. Add semaphore uninterruptible wait function
2 .Replace semaphore wait loop with a single uninterruptible wait
3. Replace all sem_xxx to nxsem_xxx

* Unify the void cast usage

1. Remove void cast for function because many place ignore the returned value witout cast
2. Replace void cast for variable with UNUSED macro
2020-01-02 10:54:43 -06:00

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/****************************************************************************
* fs/procfs/fs_procfsproc.c
*
* Copyright (C) 2013-2019 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/statfs.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#ifdef CONFIG_SCHED_CRITMONITOR
# include <time.h>
#endif
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include <nuttx/kmalloc.h>
#include <nuttx/environ.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/procfs.h>
#include <nuttx/fs/dirent.h>
#if defined(CONFIG_SCHED_CPULOAD) || defined(CONFIG_SCHED_CRITMONITOR)
# include <nuttx/clock.h>
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS)
#ifndef CONFIG_FS_PROCFS_EXCLUDE_PROCESS
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* See include/nuttx/sched.h: */
#undef HAVE_GROUPID
#if defined(CONFIG_SCHED_HAVE_PARENT) && defined(CONFIG_SCHED_CHILD_STATUS)
# define HAVE_GROUPID 1
#endif
#ifdef CONFIG_DISABLE_PTHREAD
# undef HAVE_GROUPID
#endif
/* Determines the size of an intermediate buffer that must be large enough
* to handle the longest line generated by this logic.
*/
#define STATUS_LINELEN 32
/****************************************************************************
* Private Type Definitions
****************************************************************************/
/* This enumeration identifies all of the task/thread nodes that can be
* accessed via the procfs file system.
*/
enum proc_node_e
{
PROC_LEVEL0 = 0, /* The top-level directory */
PROC_STATUS, /* Task/thread status */
PROC_CMDLINE, /* Task command line */
#ifdef CONFIG_SCHED_CPULOAD
PROC_LOADAVG, /* Average CPU utilization */
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
PROC_CRITMON, /* Critical section monitor */
#endif
PROC_STACK, /* Task stack info */
PROC_GROUP, /* Group directory */
PROC_GROUP_STATUS, /* Task group status */
PROC_GROUP_FD /* Group file descriptors */
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
, PROC_GROUP_ENV /* Group environment variables */
#endif
};
/* This structure associates a relative path name with an node in the task
* procfs
*/
struct proc_node_s
{
FAR const char *relpath; /* Relative path to the node */
FAR const char *name; /* Terminal node segment name */
uint8_t node; /* Type of node (see enum proc_node_e) */
uint8_t dtype; /* dirent type (see include/dirent.h) */
};
/* This structure describes one open "file" */
struct proc_file_s
{
struct procfs_file_s base; /* Base open file structure */
FAR const struct proc_node_s *node; /* Describes the file node */
pid_t pid; /* Task/thread ID */
char line[STATUS_LINELEN]; /* Pre-allocated buffer for formatted lines */
};
/* This structure describes one open "directory" */
struct proc_dir_s
{
struct procfs_dir_priv_s base; /* Base directory private data */
FAR const struct proc_node_s *node; /* Directory node description */
pid_t pid; /* ID of task/thread for attributes */
};
/* This structure used with the env_foreach() callback */
struct proc_envinfo_s
{
FAR struct proc_file_s *procfile;
FAR char *buffer;
FAR off_t offset;
size_t buflen;
size_t remaining;
size_t totalsize;
};
/****************************************************************************
* Private Data
****************************************************************************/
static FAR const char *g_policy[4] =
{
"SCHED_FIFO", "SCHED_RR", "SCHED_SPORADIC", "SCHED_OTHER"
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Helpers */
static FAR const struct proc_node_s *
proc_findnode(FAR const char *relpath);
static ssize_t proc_status(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
static ssize_t proc_cmdline(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
#ifdef CONFIG_SCHED_CPULOAD
static ssize_t proc_loadavg(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
static ssize_t proc_critmon(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
#endif
static ssize_t proc_stack(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
static ssize_t proc_groupstatus(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
static ssize_t proc_groupfd(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
static int proc_groupenv_callback(FAR void *arg, FAR const char *pair);
static ssize_t proc_groupenv(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset);
#endif
/* File system methods */
static int proc_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode);
static int proc_close(FAR struct file *filep);
static ssize_t proc_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static int proc_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int proc_opendir(const char *relpath, FAR struct fs_dirent_s *dir);
static int proc_closedir(FAR struct fs_dirent_s *dir);
static int proc_readdir(FAR struct fs_dirent_s *dir);
static int proc_rewinddir(FAR struct fs_dirent_s *dir);
static int proc_stat(FAR const char *relpath, FAR struct stat *buf);
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/* See fs_mount.c -- this structure is explicitly externed there.
* We use the old-fashioned kind of initializers so that this will compile
* with any compiler.
*/
const struct procfs_operations proc_operations =
{
proc_open, /* open */
proc_close, /* close */
proc_read, /* read */
NULL, /* write */
proc_dup, /* dup */
proc_opendir, /* opendir */
proc_closedir, /* closedir */
proc_readdir, /* readdir */
proc_rewinddir, /* rewinddir */
proc_stat /* stat */
};
/* These structures provide information about every node */
static const struct proc_node_s g_level0node =
{
"", "", (uint8_t)PROC_LEVEL0, DTYPE_DIRECTORY /* Top-level directory */
};
static const struct proc_node_s g_status =
{
"status", "status", (uint8_t)PROC_STATUS, DTYPE_FILE /* Task/thread status */
};
static const struct proc_node_s g_cmdline =
{
"cmdline", "cmdline", (uint8_t)PROC_CMDLINE, DTYPE_FILE /* Task command line */
};
#ifdef CONFIG_SCHED_CPULOAD
static const struct proc_node_s g_loadavg =
{
"loadavg", "loadavg", (uint8_t)PROC_LOADAVG, DTYPE_FILE /* Average CPU utilization */
};
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
static const struct proc_node_s g_critmon =
{
"critmon", "critmon", (uint8_t)PROC_CRITMON, DTYPE_FILE /* Critical Section Monitor */
};
#endif
static const struct proc_node_s g_stack =
{
"stack", "stack", (uint8_t)PROC_STACK, DTYPE_FILE /* Task stack info */
};
static const struct proc_node_s g_group =
{
"group", "group", (uint8_t)PROC_GROUP, DTYPE_DIRECTORY /* Group directory */
};
static const struct proc_node_s g_groupstatus =
{
"group/status", "status", (uint8_t)PROC_GROUP_STATUS, DTYPE_FILE /* Task group status */
};
static const struct proc_node_s g_groupfd =
{
"group/fd", "fd", (uint8_t)PROC_GROUP_FD, DTYPE_FILE /* Group file descriptors */
};
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
static const struct proc_node_s g_groupenv =
{
"group/env", "env", (uint8_t)PROC_GROUP_ENV, DTYPE_FILE /* Group environment variables */
};
#endif
/* This is the list of all nodes */
static FAR const struct proc_node_s * const g_nodeinfo[] =
{
&g_status, /* Task/thread status */
&g_cmdline, /* Task command line */
#ifdef CONFIG_SCHED_CPULOAD
&g_loadavg, /* Average CPU utilization */
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
&g_critmon, /* Critical section Monitor */
#endif
&g_stack, /* Task stack info */
&g_group, /* Group directory */
&g_groupstatus, /* Task group status */
&g_groupfd /* Group file descriptors */
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
, &g_groupenv /* Group environment variables */
#endif
};
#define PROC_NNODES (sizeof(g_nodeinfo)/sizeof(FAR const struct proc_node_s * const))
/* This is the list of all level0 nodes */
static const struct proc_node_s * const g_level0info[] =
{
&g_status, /* Task/thread status */
&g_cmdline, /* Task command line */
#ifdef CONFIG_SCHED_CPULOAD
&g_loadavg, /* Average CPU utilization */
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
&g_critmon, /* Critical section monitor */
#endif
&g_stack, /* Task stack info */
&g_group, /* Group directory */
};
#define PROC_NLEVEL0NODES (sizeof(g_level0info)/sizeof(FAR const struct proc_node_s * const))
/* This is the list of all group sub-directory nodes */
static FAR const struct proc_node_s * const g_groupinfo[] =
{
&g_groupstatus, /* Task group status */
&g_groupfd /* Group file descriptors */
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
, &g_groupenv /* Group environment variables */
#endif
};
#define PROC_NGROUPNODES (sizeof(g_groupinfo)/sizeof(FAR const struct proc_node_s * const))
/* Names of task/thread states */
static FAR const char *g_statenames[] =
{
"Invalid",
"Waiting,Unlock",
"Ready",
#ifdef CONFIG_SMP
"Assigned",
#endif
"Running",
"Inactive",
"Waiting,Semaphore",
"Waiting,Signal"
#ifndef CONFIG_DISABLE_MQUEUE
, "Waiting,MQ empty"
, "Waiting,MQ full"
#endif
#ifdef CONFIG_SIG_SIGSTOP_ACTION
, "Stopped"
#endif
};
static FAR const char *g_ttypenames[4] =
{
"Task",
"pthread",
"Kthread",
"Invalid"
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: proc_findnode
****************************************************************************/
static FAR const struct proc_node_s *proc_findnode(FAR const char *relpath)
{
int i;
/* Search every string in g_nodeinfo or until a match is found */
for (i = 0; i < PROC_NNODES; i++)
{
if (strcmp(g_nodeinfo[i]->relpath, relpath) == 0)
{
return g_nodeinfo[i];
}
}
/* Not found */
return NULL;
}
/****************************************************************************
* Name: proc_status
*
* Description:
* Format:
*
* 111111111122222222223
* 123456789012345678901234567890
* Name: xxxx... Task/thread name (See
* CONFIG_TASK_NAME_SIZE)
* Type: xxxxxxx {Task, pthread, Kthread, Invalid}
* PPID: xxxxx Parent thread ID
* Group: xxxxx Group ID
* CPU: xxx CPU (CONFIG_SMP only)
* State: xxxxxxxx,xxxxxxxxx {Invalid, Waiting, Ready, Running,
* Inactive},
* {Unlock, Semaphore, Signal, MQ empty,
* MQ full}
* Flags: xxx N,P,X
* Priority: nnn Decimal, 0-255
* Scheduler: xxxxxxxxxxxxxx {SCHED_FIFO, SCHED_RR, SCHED_SPORADIC,
* SCHED_OTHER}
* Sigmask: nnnnnnnn Hexadecimal, 32-bit
*
****************************************************************************/
static ssize_t proc_status(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
#ifdef CONFIG_SCHED_HAVE_PARENT
FAR struct task_group_s *group;
#endif
FAR const char *policy;
FAR const char *name;
size_t remaining;
size_t linesize;
size_t copysize;
size_t totalsize;
remaining = buflen;
totalsize = 0;
/* Show the task name */
#if CONFIG_TASK_NAME_SIZE > 0
name = tcb->name;
#else
name = "<noname>";
#endif
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%s\n",
"Name:", name);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Show the thread type */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%s\n", "Type:",
g_ttypenames[(tcb->flags & TCB_FLAG_TTYPE_MASK) >>
TCB_FLAG_TTYPE_SHIFT]);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
#ifdef CONFIG_SCHED_HAVE_PARENT
group = tcb->group;
DEBUGASSERT(group != NULL);
#ifdef HAVE_GROUPID
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n", "Group:",
group->tg_pgrpid);
#else
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n", "PPID:",
group->tg_ppid);
#endif
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
#endif
#ifdef CONFIG_SMP
if (tcb->task_state >= FIRST_ASSIGNED_STATE &&
tcb->task_state <= LAST_ASSIGNED_STATE)
{
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n", "CPU:",
tcb->cpu);
}
else
{
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s---\n", "CPU:");
}
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
#endif
/* Show the thread state */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%s\n", "State:",
g_statenames[tcb->task_state]);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Show task flags */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%c%c%c\n", "Flags:",
tcb->flags & TCB_FLAG_NONCANCELABLE ? 'N' : '-',
tcb->flags & TCB_FLAG_CANCEL_PENDING ? 'P' : '-',
tcb->flags & TCB_FLAG_EXIT_PROCESSING ? 'P' : '-');
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Show the thread priority */
#ifdef CONFIG_PRIORITY_INHERITANCE
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d (%d)\n", "Priority:",
tcb->sched_priority, tcb->base_priority);
#else
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n", "Priority:",
tcb->sched_priority);
#endif
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Show the scheduler policy */
policy = g_policy[(tcb->flags & TCB_FLAG_POLICY_MASK) >> TCB_FLAG_POLICY_SHIFT];
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%s\n", "Scheduler:",
policy);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Show the signal mask */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%08x\n", "SigMask:",
tcb->sigprocmask);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
return totalsize;
}
/****************************************************************************
* Name: proc_cmdline
****************************************************************************/
static ssize_t proc_cmdline(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
FAR struct task_tcb_s *ttcb;
FAR const char *name;
FAR char **argv;
size_t remaining;
size_t linesize;
size_t copysize;
size_t totalsize;
remaining = buflen;
totalsize = 0;
/* Show the task name */
#if CONFIG_TASK_NAME_SIZE > 0
name = tcb->name;
#else
name = "<noname>";
#endif
linesize = strlen(name);
memcpy(procfile->line, name, linesize);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
#ifndef CONFIG_DISABLE_PTHREAD
/* Show the pthread argument */
if ((tcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD)
{
FAR struct pthread_tcb_s *ptcb = (FAR struct pthread_tcb_s *)tcb;
linesize = snprintf(procfile->line, STATUS_LINELEN, " 0x%p\n",
ptcb->arg);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
return totalsize;
}
#endif
/* Show the task argument list (skipping over the name) */
ttcb = (FAR struct task_tcb_s *)tcb;
for (argv = ttcb->argv + 1; *argv; argv++)
{
linesize = snprintf(procfile->line, STATUS_LINELEN, " %s", *argv);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
}
linesize = snprintf(procfile->line, STATUS_LINELEN, "\n");
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
return totalsize;
}
/****************************************************************************
* Name: proc_loadavg
****************************************************************************/
#ifdef CONFIG_SCHED_CPULOAD
static ssize_t proc_loadavg(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
struct cpuload_s cpuload;
uint32_t intpart;
uint32_t fracpart;
size_t linesize;
size_t copysize;
/* Sample the counts for the thread. clock_cpuload should only fail if
* the PID is not valid. This could happen if the thread exited sometime
* after the procfs entry was opened.
*/
clock_cpuload(procfile->pid, &cpuload);
/* On the simulator, you may hit cpuload.total == 0, but probably never on
* real hardware.
*/
if (cpuload.total > 0)
{
uint32_t tmp;
tmp = (1000 * cpuload.active) / cpuload.total;
intpart = tmp / 10;
fracpart = tmp - 10 * intpart;
}
else
{
intpart = 0;
fracpart = 0;
}
linesize = snprintf(procfile->line, STATUS_LINELEN, "%3d.%01d%%",
intpart, fracpart);
copysize = procfs_memcpy(procfile->line, linesize, buffer, buflen, &offset);
return copysize;
}
#endif
/****************************************************************************
* Name: proc_critmon
****************************************************************************/
#ifdef CONFIG_SCHED_CRITMONITOR
static ssize_t proc_critmon(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
struct timespec maxtime;
size_t remaining;
size_t linesize;
size_t copysize;
size_t totalsize;
remaining = buflen;
totalsize = 0;
/* Convert the for maximum time pre-emption disabled */
if (tcb->premp_max > 0)
{
up_critmon_convert(tcb->premp_max, &maxtime);
}
else
{
maxtime.tv_sec = 0;
maxtime.tv_nsec = 0;
}
/* Reset the maximum */
tcb->premp_max = 0;
/* Generate output for maximum time pre-emption disabled */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%lu.%09lu,",
(unsigned long)maxtime.tv_sec,
(unsigned long)maxtime.tv_nsec);
copysize = procfs_memcpy(procfile->line, linesize, buffer, buflen, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Convert and generate output for maximum time in a critical section */
if (tcb->crit_max > 0)
{
up_critmon_convert(tcb->crit_max, &maxtime);
}
else
{
maxtime.tv_sec = 0;
maxtime.tv_nsec = 0;
}
/* Reset the maximum */
tcb->crit_max = 0;
/* Generate output for maximum time in a critical section */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%lu.%09lu\n",
(unsigned long)maxtime.tv_sec,
(unsigned long)maxtime.tv_nsec);
copysize = procfs_memcpy(procfile->line, linesize, buffer, buflen, &offset);
totalsize += copysize;
return totalsize;
}
#endif
/****************************************************************************
* Name: proc_stack
****************************************************************************/
static ssize_t proc_stack(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
size_t remaining;
size_t linesize;
size_t copysize;
size_t totalsize;
remaining = buflen;
totalsize = 0;
/* Show the stack base address */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s0x%p\n",
"StackBase:", tcb->adj_stack_ptr);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Show the stack size */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%ld\n",
"StackSize:", (long)tcb->adj_stack_size);
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
#ifdef CONFIG_STACK_COLORATION
if (totalsize >= buflen)
{
return totalsize;
}
/* Show the stack size */
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%ld\n",
"StackUsed:", (long)up_check_tcbstack(tcb));
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
#endif
return totalsize;
}
/****************************************************************************
* Name: proc_groupstatus
****************************************************************************/
static ssize_t proc_groupstatus(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
FAR struct task_group_s *group = tcb->group;
size_t remaining;
size_t linesize;
size_t copysize;
size_t totalsize;
#ifdef HAVE_GROUP_MEMBERS
int i;
#endif
DEBUGASSERT(group != NULL);
remaining = buflen;
totalsize = 0;
/* Show the group IDs */
#ifdef HAVE_GROUP_MEMBERS
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n",
"Group ID:", group->tg_grpid);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n",
"Parent ID:", group->tg_pgrpid);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
#endif
#if !defined(CONFIG_DISABLE_PTHREAD) && defined(CONFIG_SCHED_HAVE_PARENT)
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n",
"Main task:", group->tg_task);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
#endif
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s0x%02x\n",
"Flags:", group->tg_flags);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
linesize = snprintf(procfile->line, STATUS_LINELEN, "%-12s%d\n",
"Members:", group->tg_nmembers);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
#ifdef HAVE_GROUP_MEMBERS
if (totalsize >= buflen)
{
return totalsize;
}
linesize = snprintf(procfile->line, STATUS_LINELEN, "Member IDs:");
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
for (i = 0; i < group->tg_nmembers; i++)
{
linesize = snprintf(procfile->line, STATUS_LINELEN, " %d",
group->tg_members[i]);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
}
linesize = snprintf(procfile->line, STATUS_LINELEN, "\n");
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
#endif
return totalsize;
}
/****************************************************************************
* Name: proc_groupfd
****************************************************************************/
static ssize_t proc_groupfd(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer,
size_t buflen, off_t offset)
{
FAR struct task_group_s *group = tcb->group;
FAR struct file *file;
#ifdef CONFIG_NET
FAR struct socket *socket;
#endif
size_t remaining;
size_t linesize;
size_t copysize;
size_t totalsize;
int i;
DEBUGASSERT(group != NULL);
remaining = buflen;
totalsize = 0;
linesize = snprintf(procfile->line, STATUS_LINELEN, "\n%-3s %-8s %s\n",
"FD", "POS", "OFLAGS");
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Examine each open file descriptor */
for (i = 0, file = group->tg_filelist.fl_files;
i < CONFIG_NFILE_DESCRIPTORS;
i++, file++)
{
/* Is there an inode associated with the file descriptor? */
if (file->f_inode)
{
linesize = snprintf(procfile->line, STATUS_LINELEN,
"%3d %8ld %04x\n", i, (long)file->f_pos,
file->f_oflags);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
}
}
#ifdef CONFIG_NET
linesize = snprintf(procfile->line, STATUS_LINELEN, "\n%-3s %-2s %-3s %s\n",
"SD", "RF", "TYP", "FLAGS");
copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
/* Examine each open socket descriptor */
for (i = 0, socket = group->tg_socketlist.sl_sockets;
i < CONFIG_NSOCKET_DESCRIPTORS;
i++, socket++)
{
/* Is there an connection associated with the socket descriptor? */
if (socket->s_conn)
{
linesize = snprintf(procfile->line, STATUS_LINELEN,
"%3d %2d %3d %02x",
i + CONFIG_NFILE_DESCRIPTORS,
socket->s_crefs, socket->s_type,
socket->s_flags);
copysize = procfs_memcpy(procfile->line, linesize, buffer,
remaining, &offset);
totalsize += copysize;
buffer += copysize;
remaining -= copysize;
if (totalsize >= buflen)
{
return totalsize;
}
}
}
#endif
return totalsize;
}
/****************************************************************************
* Name: proc_groupenv_callback
****************************************************************************/
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
static int proc_groupenv_callback(FAR void *arg, FAR const char *pair)
{
FAR struct proc_envinfo_s *info = (FAR struct proc_envinfo_s *)arg;
FAR const char *src;
FAR const char *value;
FAR char *dest;
char name[16 + 1];
size_t linesize;
size_t copysize;
int namelen;
DEBUGASSERT(arg != NULL && pair != NULL);
/* Parse the name from the name/value pair */
value = NULL;
namelen = 0;
for (src = pair, dest = name; *src != '=' && *src != '\0'; src++)
{
if (namelen < 16)
{
*dest++ = *src;
namelen++;
}
}
/* NUL terminate the name string */
*dest = '\0';
/* Skip over the '=' to get the value */
if (*src == '=')
{
value = src + 1;
}
else
{
value = "";
}
/* Output the header */
linesize = snprintf(info->procfile->line, STATUS_LINELEN, "%s=%s\n",
name, value);
copysize = procfs_memcpy(info->procfile->line, linesize, info->buffer,
info->remaining, &info->offset);
info->totalsize += copysize;
info->buffer += copysize;
info->remaining -= copysize;
if (info->totalsize >= info->buflen)
{
return 1;
}
return 0;
}
#endif
/****************************************************************************
* Name: proc_groupenv
****************************************************************************/
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
static ssize_t proc_groupenv(FAR struct proc_file_s *procfile,
FAR struct tcb_s *tcb, FAR char *buffer, size_t buflen,
off_t offset)
{
FAR struct task_group_s *group = tcb->group;
struct proc_envinfo_s info;
DEBUGASSERT(group != NULL);
/* Initialize the info structure */
info.procfile = procfile;
info.buffer = buffer;
info.offset = offset;
info.buflen = buflen;
info.remaining = buflen;
info.totalsize = 0;
/* Generate output for each environment variable */
env_foreach(group, proc_groupenv_callback, &info);
return info.totalsize;
}
#endif
/****************************************************************************
* Name: proc_open
****************************************************************************/
static int proc_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct proc_file_s *procfile;
FAR const struct proc_node_s *node;
FAR struct tcb_s *tcb;
FAR char *ptr;
unsigned long tmp;
pid_t pid;
finfo("Open '%s'\n", relpath);
/* PROCFS is read-only. Any attempt to open with any kind of write
* access is not permitted.
*
* REVISIT: Write-able proc files could be quite useful.
*/
if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
{
ferr("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* The first segment of the relative path should be a task/thread ID or
* the string "self".
*/
ptr = NULL;
if (strncmp(relpath, "self", 4) == 0)
{
tmp = (unsigned long)getpid(); /* Get the PID of the calling task */
ptr = (FAR char *)relpath + 4; /* Discard const */
}
else
{
tmp = strtoul(relpath, &ptr, 10); /* Extract the PID from path */
}
if (ptr == NULL || *ptr != '/')
{
ferr("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* Skip over the slash */
ptr++;
/* A valid PID would be in the range of 0-32767 (0 is reserved for the
* IDLE thread).
*/
if (tmp >= 32768)
{
ferr("ERROR: Invalid PID %ld\n", tmp);
return -ENOENT;
}
/* Now verify that a task with this task/thread ID exists */
pid = (pid_t)tmp;
tcb = sched_gettcb(pid);
if (tcb == NULL)
{
ferr("ERROR: PID %d is no longer valid\n", (int)pid);
return -ENOENT;
}
/* The remaining segments of the relpath should be a well known node in
* the task/thread tree.
*/
node = proc_findnode(ptr);
if (node == NULL)
{
ferr("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* The node must be a file, not a directory */
if (!DIRENT_ISFILE(node->dtype))
{
ferr("ERROR: Path \"%s\" is not a regular file\n", relpath);
return -EISDIR;
}
/* Allocate a container to hold the task and node selection */
procfile = (FAR struct proc_file_s *)kmm_zalloc(sizeof(struct proc_file_s));
if (procfile == NULL)
{
ferr("ERROR: Failed to allocate file container\n");
return -ENOMEM;
}
/* Initialize the file container */
procfile->pid = pid;
procfile->node = node;
/* Save the index as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)procfile;
return OK;
}
/****************************************************************************
* Name: proc_close
****************************************************************************/
static int proc_close(FAR struct file *filep)
{
FAR struct proc_file_s *procfile;
/* Recover our private data from the struct file instance */
procfile = (FAR struct proc_file_s *)filep->f_priv;
DEBUGASSERT(procfile != NULL);
/* Release the file container structure */
kmm_free(procfile);
filep->f_priv = NULL;
return OK;
}
/****************************************************************************
* Name: proc_read
****************************************************************************/
static ssize_t proc_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct proc_file_s *procfile;
FAR struct tcb_s *tcb;
ssize_t ret;
finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
procfile = (FAR struct proc_file_s *)filep->f_priv;
DEBUGASSERT(procfile != NULL);
/* Verify that the thread is still valid */
tcb = sched_gettcb(procfile->pid);
if (tcb == NULL)
{
ferr("ERROR: PID %d is not valid\n", (int)procfile->pid);
return -ENODEV;
}
/* Provide the requested data */
switch (procfile->node->node)
{
case PROC_STATUS: /* Task/thread status */
ret = proc_status(procfile, tcb, buffer, buflen, filep->f_pos);
break;
case PROC_CMDLINE: /* Task command line */
ret = proc_cmdline(procfile, tcb, buffer, buflen, filep->f_pos);
break;
#ifdef CONFIG_SCHED_CPULOAD
case PROC_LOADAVG: /* Average CPU utilization */
ret = proc_loadavg(procfile, tcb, buffer, buflen, filep->f_pos);
break;
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
case PROC_CRITMON: /* Critical section monitor */
ret = proc_critmon(procfile, tcb, buffer, buflen, filep->f_pos);
break;
#endif
case PROC_STACK: /* Task stack info */
ret = proc_stack(procfile, tcb, buffer, buflen, filep->f_pos);
break;
case PROC_GROUP_STATUS: /* Task group status */
ret = proc_groupstatus(procfile, tcb, buffer, buflen, filep->f_pos);
break;
case PROC_GROUP_FD: /* Group file descriptors */
ret = proc_groupfd(procfile, tcb, buffer, buflen, filep->f_pos);
break;
#if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_FS_PROCFS_EXCLUDE_ENVIRON)
case PROC_GROUP_ENV: /* Group environment variables */
ret = proc_groupenv(procfile, tcb, buffer, buflen, filep->f_pos);
break;
#endif
default:
ret = -EINVAL;
break;
}
/* Update the file offset */
if (ret > 0)
{
filep->f_pos += ret;
}
return ret;
}
/****************************************************************************
* Name: proc_dup
*
* Description:
* Duplicate open file data in the new file structure.
*
****************************************************************************/
static int proc_dup(FAR const struct file *oldp, FAR struct file *newp)
{
FAR struct proc_file_s *oldfile;
FAR struct proc_file_s *newfile;
finfo("Dup %p->%p\n", oldp, newp);
/* Recover our private data from the old struct file instance */
oldfile = (FAR struct proc_file_s *)oldp->f_priv;
DEBUGASSERT(oldfile != NULL);
/* Allocate a new container to hold the task and node selection */
newfile = (FAR struct proc_file_s *)kmm_malloc(sizeof(struct proc_file_s));
if (newfile == NULL)
{
ferr("ERROR: Failed to allocate file container\n");
return -ENOMEM;
}
/* The copy the file information from the old container to the new */
memcpy(newfile, oldfile, sizeof(struct proc_file_s));
/* Save the new container in the new file structure */
newp->f_priv = (FAR void *)newfile;
return OK;
}
/****************************************************************************
* Name: proc_opendir
*
* Description:
* Open a directory for read access
*
****************************************************************************/
static int proc_opendir(FAR const char *relpath, FAR struct fs_dirent_s *dir)
{
FAR struct proc_dir_s *procdir;
FAR const struct proc_node_s *node;
FAR struct tcb_s *tcb;
unsigned long tmp;
FAR char *ptr;
pid_t pid;
finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
DEBUGASSERT(relpath != NULL && dir != NULL && dir->u.procfs == NULL);
/* The relative must be either:
*
* (1) "<pid>" - The sub-directory of task/thread attributes,
* (2) "self" - Which refers to the PID of the calling task, or
* (3) The name of a directory node under either of those
*/
/* Otherwise, the relative path should be a valid task/thread ID */
ptr = NULL;
if (strncmp(relpath, "self", 4) == 0)
{
tmp = (unsigned long)getpid(); /* Get the PID of the calling task */
ptr = (FAR char *)relpath + 4; /* Discard const */
}
else
{
tmp = strtoul(relpath, &ptr, 10); /* Extract the PID from path */
}
if (ptr == NULL || (*ptr != '\0' && *ptr != '/'))
{
/* strtoul failed or there is something in the path after the pid */
ferr("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* A valid PID would be in the range of 0-32767 (0 is reserved for the
* IDLE thread).
*/
if (tmp >= 32768)
{
ferr("ERROR: Invalid PID %ld\n", tmp);
return -ENOENT;
}
/* Now verify that a task with this task/thread ID exists */
pid = (pid_t)tmp;
tcb = sched_gettcb(pid);
if (tcb == NULL)
{
ferr("ERROR: PID %d is not valid\n", (int)pid);
return -ENOENT;
}
/* Allocate the directory structure. Note that the index and procentry
* pointer are implicitly nullified by kmm_zalloc(). Only the remaining,
* non-zero entries will need be initialized.
*/
procdir = (FAR struct proc_dir_s *)kmm_zalloc(sizeof(struct proc_dir_s));
if (procdir == NULL)
{
ferr("ERROR: Failed to allocate the directory structure\n");
return -ENOMEM;
}
/* Was the <pid> the final element of the path? */
if (*ptr != '\0' && strcmp(ptr, "/") != 0)
{
/* There is something in the path after the pid. Skip over the path
* segment delimiter and see if we can identify the node of interest.
*/
ptr++;
node = proc_findnode(ptr);
if (node == NULL)
{
ferr("ERROR: Invalid path \"%s\"\n", relpath);
kmm_free(procdir);
return -ENOENT;
}
/* The node must be a directory, not a file */
if (!DIRENT_ISDIRECTORY(node->dtype))
{
ferr("ERROR: Path \"%s\" is not a directory\n", relpath);
kmm_free(procdir);
return -ENOTDIR;
}
/* This is a second level directory */
procdir->base.level = 2;
procdir->base.nentries = PROC_NGROUPNODES;
procdir->node = node;
}
else
{
/* Use the special level0 node */
procdir->base.level = 1;
procdir->base.nentries = PROC_NLEVEL0NODES;
procdir->node = &g_level0node;
}
procdir->pid = pid;
dir->u.procfs = (FAR void *)procdir;
return OK;
}
/****************************************************************************
* Name: proc_closedir
*
* Description: Close the directory listing
*
****************************************************************************/
static int proc_closedir(FAR struct fs_dirent_s *dir)
{
FAR struct proc_dir_s *priv;
DEBUGASSERT(dir != NULL && dir->u.procfs != NULL);
priv = dir->u.procfs;
if (priv)
{
kmm_free(priv);
}
dir->u.procfs = NULL;
return OK;
}
/****************************************************************************
* Name: proc_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int proc_readdir(struct fs_dirent_s *dir)
{
FAR struct proc_dir_s *procdir;
FAR const struct proc_node_s *node = NULL;
FAR struct tcb_s *tcb;
unsigned int index;
pid_t pid;
int ret;
DEBUGASSERT(dir != NULL && dir->u.procfs != NULL);
procdir = dir->u.procfs;
/* Have we reached the end of the directory */
index = procdir->base.index;
if (index >= procdir->base.nentries)
{
/* We signal the end of the directory by returning the special
* error -ENOENT
*/
finfo("Entry %d: End of directory\n", index);
ret = -ENOENT;
}
/* No, we are not at the end of the directory */
else
{
/* Verify that the pid still refers to an active task/thread */
pid = procdir->pid;
tcb = sched_gettcb(pid);
if (tcb == NULL)
{
ferr("ERROR: PID %d is no longer valid\n", (int)pid);
return -ENOENT;
}
/* The TCB is still valid (or at least was when we entered this
* function)
*
* Handle the directory listing by the node type.
*/
switch (procdir->node->node)
{
case PROC_LEVEL0: /* Top level directory */
DEBUGASSERT(procdir->base.level == 1);
node = g_level0info[index];
break;
case PROC_GROUP: /* Group sub-directory */
DEBUGASSERT(procdir->base.level == 2);
node = g_groupinfo[index];
break;
default:
return -ENOENT;
}
/* Save the filename and file type */
dir->fd_dir.d_type = node->dtype;
strncpy(dir->fd_dir.d_name, node->name, NAME_MAX + 1);
/* Set up the next directory entry offset. NOTE that we could use the
* standard f_pos instead of our own private index.
*/
procdir->base.index = index + 1;
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: proc_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int proc_rewinddir(struct fs_dirent_s *dir)
{
FAR struct proc_dir_s *priv;
DEBUGASSERT(dir != NULL && dir->u.procfs != NULL);
priv = dir->u.procfs;
priv->base.index = 0;
return OK;
}
/****************************************************************************
* Name: proc_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int proc_stat(const char *relpath, struct stat *buf)
{
FAR const struct proc_node_s *node;
FAR struct tcb_s *tcb;
unsigned long tmp;
FAR char *ptr;
pid_t pid;
/* Two path forms are accepted:
*
* "<pid>" - If <pid> refers to a currently active task/thread, then it
* is a directory
* "<pid>/<node>" - If <node> is a recognized node then, then it
* is a file or directory.
*/
ptr = NULL;
if (strncmp(relpath, "self", 4) == 0)
{
tmp = (unsigned long)getpid(); /* Get the PID of the calling task */
ptr = (FAR char *)relpath + 4; /* Discard const */
}
else
{
tmp = strtoul(relpath, &ptr, 10); /* Extract the PID from path */
}
if (ptr == NULL)
{
ferr("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* A valid PID would be in the range of 0-32767 (0 is reserved for the
* IDLE thread).
*/
if (tmp >= 32768)
{
ferr("ERROR: Invalid PID %ld\n", tmp);
return -ENOENT;
}
/* Now verify that a task with this task/thread ID exists */
pid = (pid_t)tmp;
tcb = sched_gettcb(pid);
if (tcb == NULL)
{
ferr("ERROR: PID %d is no longer valid\n", (int)pid);
return -ENOENT;
}
/* Was the <pid> the final element of the path? */
memset(buf, 0, sizeof(struct stat));
if (*ptr == '\0' || strcmp(ptr, "/") == 0)
{
/* Yes ... It's a read-only directory */
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
}
/* Verify that the process ID is followed by valid path segment delimiter */
else if (*ptr != '/')
{
/* We are required to return -ENOENT all all invalid paths */
ferr("ERROR: Bad delimiter '%c' in relpath '%s'\n", *ptr, relpath);
return -ENOENT;
}
else
{
/* Otherwise, the second segment of the relpath should be a well
* known node of the task/thread directory structure.
*/
/* Skip over the path segment delimiter */
ptr++;
/* Lookup the well-known node associated with the relative path. */
node = proc_findnode(ptr);
if (node == NULL)
{
ferr("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* If the node exists, it is the name for a read-only file or
* directory.
*/
if (node->dtype == DTYPE_FILE)
{
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
}
else
{
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
}
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* CONFIG_FS_PROCFS_EXCLUDE_PROCESS */
#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS */
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