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nuttx-apps/nshlib/nsh_proccmds.c

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/****************************************************************************
* apps/nshlib/nsh_proccmds.c
*
* Copyright (C) 2007-2009, 2011-2012, 2014 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sched.h>
#include <errno.h>
#include "nsh.h"
#include "nsh_console.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_NSH_PROC_MOUNTPOINT
# define CONFIG_NSH_PROC_MOUNTPOINT "/proc"
#endif
#undef HAVE_CPULOAD
#if defined(CONFIG_SCHED_CPULOAD) && defined(CONFIG_FS_PROCFS) && \
!defined(CONFIG_FS_PROCFS_EXCLUDE_CPULOAD)
# define HAVE_CPULOAD 1
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* The returned value should be zero for success or TRUE or non zero for
* failure or FALSE.
*/
typedef int (*exec_t)(void);
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_PS
static const char *g_statenames[] =
{
"INVALID ",
"PENDING ",
"READY ",
"RUNNING ",
"INACTIVE",
"WAITSEM ",
#ifndef CONFIG_DISABLE_SIGNALS
"WAITSIG ",
#endif
#ifndef CONFIG_DISABLE_MQUEUE
"MQNEMPTY",
"MQNFULL "
#endif
};
static const char *g_ttypenames[4] =
{
"TASK ",
"PTHREAD",
"KTHREAD",
"--?-- "
};
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: readfile
****************************************************************************/
#ifdef HAVE_CPULOAD
static int readfile(FAR const char *filename, FAR char *buffer, size_t buflen)
{
FAR char *bufptr;
size_t remaining;
ssize_t nread;
ssize_t ntotal;
int fd;
int ret;
/* Open the file */
fd = open(filename, O_RDONLY);
if (fd < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
return -errcode;
}
/* Read until we hit the end of the file, until we have exhausted the
* buffer space, or until some irrecoverable error occurs
*/
ntotal = 0; /* No bytes read yet */
*buffer = '\0'; /* NUL terminate the empty buffer */
bufptr = buffer; /* Working pointer */
remaining = buflen - 1; /* Reserve one byte for a NUL terminator */
ret = -E2BIG; /* Assume result will not fit in the buffer */
do
{
nread = read(fd, bufptr, remaining);
if (nread < 0)
{
/* Read error */
int errcode = errno;
DEBUGASSERT(errcode > 0);
/* EINTR is not a read error. It simply means that a signal was
* received while waiting for the read to complete.
*/
if (errcode != EINTR)
{
/* Fatal error */
ret = -errcode;
break;
}
}
else if (nread == 0)
{
/* End of file */
ret = OK;
break;
}
else
{
/* Successful read. Make sure that the buffer is null terminated */
DEBUGASSERT(nread <= remaining);
ntotal += nread;
buffer[ntotal] = '\0';
/* Bump up the read count and continuing reading to the end of
* file.
*/
bufptr += nread;
remaining -= nread;
}
}
while (buflen > 0);
/* Close the file and return. */
close(fd);
return ret;
}
#endif
/****************************************************************************
* Name: loadavg
****************************************************************************/
#ifdef HAVE_CPULOAD
static int loadavg(pid_t pid, FAR char *buffer, size_t buflen)
{
char path[24];
/* Form the full path to the 'loadavg' pseudo-file */
snprintf(path, sizeof(path), CONFIG_NSH_PROC_MOUNTPOINT "/%d/loadavg",
(int)pid);
/* Read the 'loadavg' pseudo-file into the user buffer */
return readfile(path, buffer, buflen);
}
#endif
/****************************************************************************
* Name: ps_task
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_PS
static void ps_task(FAR struct tcb_s *tcb, FAR void *arg)
{
struct nsh_vtbl_s *vtbl = (struct nsh_vtbl_s*)arg;
#ifdef HAVE_CPULOAD
char buffer[8];
int ret;
#endif
int i;
/* Show task status */
nsh_output(vtbl, "%5d %3d %4s %7s%c%c %8s ",
tcb->pid, tcb->sched_priority,
tcb->flags & TCB_FLAG_ROUND_ROBIN ? "RR " : "FIFO",
g_ttypenames[(tcb->flags & TCB_FLAG_TTYPE_MASK) >> TCB_FLAG_TTYPE_SHIFT],
tcb->flags & TCB_FLAG_NONCANCELABLE ? 'N' : ' ',
tcb->flags & TCB_FLAG_CANCEL_PENDING ? 'P' : ' ',
g_statenames[tcb->task_state]);
#ifdef HAVE_CPULOAD
/* Get the CPU load */
ret = loadavg(tcb->pid, buffer, sizeof(buffer));
if (ret < 0)
{
/* Make the buffer into an empty string */
buffer[0] = '\0';
}
nsh_output(vtbl, "%-6s ", buffer);
#endif
/* Show task name and arguments */
#if CONFIG_TASK_NAME_SIZE > 0
nsh_output(vtbl, "%s(", tcb->name);
#else
nsh_output(vtbl, "<noname>(");
#endif
/* Is this a task or a pthread? */
#ifndef CONFIG_DISABLE_PTHREAD
if ((tcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD)
{
FAR struct pthread_tcb_s *ptcb = (FAR struct pthread_tcb_s *)tcb;
nsh_output(vtbl, "%p", ptcb->arg);
}
else
#endif
{
FAR struct task_tcb_s *ttcb = (FAR struct task_tcb_s *)tcb;
/* Special case 1st argument (no comma) */
if (ttcb->argv[1])
{
nsh_output(vtbl, "%p", ttcb->argv[1]);
/* Then any additional arguments */
for (i = 2; ttcb->argv[i]; i++)
{
nsh_output(vtbl, ", %p", ttcb->argv[i]);
}
}
}
nsh_output(vtbl, ")\n");
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: cmd_exec
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_EXEC
int cmd_exec(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
char *endptr;
uintptr_t addr;
addr = (uintptr_t)strtol(argv[1], &endptr, 0);
if (!addr || endptr == argv[1] || *endptr != '\0')
{
nsh_output(vtbl, g_fmtarginvalid, argv[0]);
return ERROR;
}
nsh_output(vtbl, "Calling %p\n", (exec_t)addr);
return ((exec_t)addr)();
}
#endif
/****************************************************************************
* Name: cmd_ps
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_PS
int cmd_ps(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
#ifdef HAVE_CPULOAD
nsh_output(vtbl, "PID PRI SCHD TYPE NP STATE CPU NAME\n");
#else
nsh_output(vtbl, "PID PRI SCHD TYPE NP STATE NAME\n");
#endif
sched_foreach(ps_task, vtbl);
return OK;
}
#endif
/****************************************************************************
* Name: cmd_kill
****************************************************************************/
#ifndef CONFIG_DISABLE_SIGNALS
#ifndef CONFIG_NSH_DISABLE_KILL
int cmd_kill(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
char *ptr;
char *endptr;
long signal;
long pid;
/* Check incoming parameters. The first parameter should be "-<signal>" */
ptr = argv[1];
if (*ptr != '-' || ptr[1] < '0' || ptr[1] > '9')
{
goto invalid_arg;
}
/* Extract the signal number */
signal = strtol(&ptr[1], &endptr, 0);
/* The second parameter should be <pid> */
ptr = argv[2];
if (*ptr < '0' || *ptr > '9')
{
goto invalid_arg;
}
/* Extract athe pid */
pid = strtol(ptr, &endptr, 0);
/* Send the signal. Kill return values:
*
* EINVAL An invalid signal was specified.
* EPERM The process does not have permission to send the signal to any
* of the target processes.
* ESRCH The pid or process group does not exist.
* ENOSYS Do not support sending signals to process groups.
*/
if (kill((pid_t)pid, (int)signal) == 0)
{
return OK;
}
switch (errno)
{
case EINVAL:
goto invalid_arg;
case ESRCH:
nsh_output(vtbl, g_fmtnosuch, argv[0], "task", argv[2]);
return ERROR;
case EPERM:
case ENOSYS:
default:
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "kill", NSH_ERRNO);
return ERROR;
}
invalid_arg:
nsh_output(vtbl, g_fmtarginvalid, argv[0]);
return ERROR;
}
#endif
#endif
/****************************************************************************
* Name: cmd_sleep
****************************************************************************/
#ifndef CONFIG_DISABLE_SIGNALS
#ifndef CONFIG_NSH_DISABLE_SLEEP
int cmd_sleep(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
char *endptr;
long secs;
secs = strtol(argv[1], &endptr, 0);
if (!secs || endptr == argv[1] || *endptr != '\0')
{
nsh_output(vtbl, g_fmtarginvalid, argv[0]);
return ERROR;
}
sleep(secs);
return OK;
}
#endif
#endif
/****************************************************************************
* Name: cmd_usleep
****************************************************************************/
#ifndef CONFIG_DISABLE_SIGNALS
#ifndef CONFIG_NSH_DISABLE_USLEEP
int cmd_usleep(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
char *endptr;
long usecs;
usecs = strtol(argv[1], &endptr, 0);
if (!usecs || endptr == argv[1] || *endptr != '\0')
{
nsh_output(vtbl, g_fmtarginvalid, argv[0]);
return ERROR;
}
usleep(usecs);
return OK;
}
#endif
#endif
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