e4652bd3dc
fs: Add truncate() support for userfs
fs/unionfs: Add truncate() support to the unionfs
fs/tmpfs: Add ftruncate() support to tmpfs
syscall/: Add system call support for ftruncate()
net/route: Adding ftruncate() support eliminates an issue in file-based routing table management.
fs: Add basic framework to support truncate() and ftruncate(). The infrastructure is complete. Now, however, the actual implementation of ftruncate() will have to be done for each file system.
236 lines
7.1 KiB
C
236 lines
7.1 KiB
C
/****************************************************************************
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* include/unistd.h
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*
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* Copyright (C) 2007-2009, 2013-2014, 2016-2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_UNISTD_H
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#define __INCLUDE_UNISTD_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <nuttx/compiler.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The number of functions that may be registered to be called
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* at program exit.
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*/
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#define ATEXIT_MAX 1
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/* Values for seeking */
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#define SEEK_SET 0 /* From the start of the file */
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#define SEEK_CUR 1 /* From the current file offset */
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#define SEEK_END 2 /* From the end of the file */
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/* Bit values for the second argument to access */
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#define F_OK 0 /* Test existence */
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#define R_OK 1 /* Test read permission */
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#define W_OK 2 /* Test write permission */
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#define X_OK 4 /* Test execute permission */
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/* POSIX feature set macros */
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#define POSIX_VERSION
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#undef _POSIX_SAVED_IDS
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#undef _POSIX_JOB_CONTROL
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#define _POSIX_REALTIME_SIGNALS 1
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#define _POSIX_MESSAGE_PASSING 1
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#undef _POSIX_MAPPED_FILES
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#undef _POSIX_SHARED_MEMORY_OBJECTS
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#define _POSIX_PRIORITY_SCHEDULING 1
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#define _POSIX_TIMERS 1
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#undef _POSIX_MEMLOCK
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#undef _POSIX_MEMLOCK_RANGE
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#undef _POSIX_FSYNC
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#define _POSIX_SYNCHRONIZED_IO 1
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#ifdef CONFIG_FS_AIO
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# define _POSIX_ASYNCHRONOUS_IO 1
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#else
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# undef _POSIX_ASYNCHRONOUS_IO
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#endif
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#undef _POSIX_PRIORITIZED_IO
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#ifdef CONFIG_SCHED_SPORADIC
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# define _POSIX_SPORADIC_SERVER 1
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# define _POSIX_THREAD_SPORADIC_SERVER 1
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#else
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# undef _POSIX_SPORADIC_SERVER
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# undef _POSIX_THREAD_SPORADIC_SERVER
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#endif
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/* Execution time constants (not supported) */
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#undef _POSIX_CHOWN_RESTRICTED
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#undef _POSIX_NO_TRUNC
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#undef _POSIX_VDISABLE
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#define _POSIX_SYNC_IO 1
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#undef _POSIX_ASYNC_IO
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#undef _POSIX_PRIO_IO
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#define fdatasync(f) fsync(f)
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#define HOST_NAME_MAX 32
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/* Used by getopt (obviously NOT thread safe!). These variables cannot be
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* accessed directly by an external NXFLAT module. In that case, accessor
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* functions must be used.
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*/
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#ifndef __NXFLAT__
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EXTERN FAR char *optarg; /* Optional argument following option */
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EXTERN int optind; /* Index into argv */
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EXTERN int optopt; /* Unrecognized option character */
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#else
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# define optarg (*(getoptargp()))
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# define optind (*(getoptindp()))
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# define optopt (*(getoptoptp()))
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* Task Control Interfaces */
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pid_t vfork(void);
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pid_t getpid(void);
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void _exit(int status) noreturn_function;
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unsigned int sleep(unsigned int seconds);
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int usleep(useconds_t usec);
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int pause(void);
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/* File descriptor operations */
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int close(int fd);
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int dup(int fd);
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int dup2(int fd1, int fd2);
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int fsync(int fd);
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off_t lseek(int fd, off_t offset, int whence);
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ssize_t read(int fd, FAR void *buf, size_t nbytes);
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ssize_t write(int fd, FAR const void *buf, size_t nbytes);
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ssize_t pread(int fd, FAR void *buf, size_t nbytes, off_t offset);
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ssize_t pwrite(int fd, FAR const void *buf, size_t nbytes, off_t offset);
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int ftruncate(int fd, off_t length);
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/* Check if a file descriptor corresponds to a terminal I/O file */
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int isatty(int fd);
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/* Memory management */
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#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_MM_PGALLOC) && \
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defined(CONFIG_ARCH_USE_MMU)
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FAR void *sbrk(intptr_t incr);
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#endif
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/* Special devices */
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int pipe(int fd[2]);
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/* Working directory operations */
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int chdir(FAR const char *path);
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FAR char *getcwd(FAR char *buf, size_t size);
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/* File path operations */
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int access(FAR const char *path, int amode);
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int rmdir(FAR const char *pathname);
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int unlink(FAR const char *pathname);
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int truncate(FAR const char *path, off_t length);
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#ifdef CONFIG_PSEUDOFS_SOFTLINKS
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int link(FAR const char *path1, FAR const char *path2);
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ssize_t readlink(FAR const char *path, FAR char *buf, size_t bufsize);
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#endif
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/* Execution of programs from files */
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#ifdef CONFIG_LIBC_EXECFUNCS
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int execl(FAR const char *path, ...);
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int execv(FAR const char *path, FAR char *const argv[]);
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#endif
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/* Byte operations */
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void swab(FAR const void *src, FAR void *dest, ssize_t nbytes);
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/* getopt and friends */
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int getopt(int argc, FAR char *const argv[], FAR const char *optstring);
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/* Accessor functions intended for use only by external NXFLAT
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* modules. The global variables optarg, optind, and optopt cannot
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* be referenced directly from external modules.
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*/
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FAR char **getoptargp(void); /* Optional argument following option */
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int *getoptindp(void); /* Index into argv */
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int *getoptoptp(void); /* Unrecognized option character */
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#ifdef CONFIG_NET
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int gethostname(FAR char *name, size_t size);
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int sethostname(FAR const char *name, size_t size);
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#endif
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_UNISTD_H */
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