mcu_hi3321_watch/open_source/musl/include/unistd.h
2025-05-26 20:15:20 +08:00

1107 lines
38 KiB
C

/**
* @defgroup unistd Unistd
* @ingroup libc
*/
#ifndef _UNISTD_H
#define _UNISTD_H
#ifdef __cplusplus
extern "C" {
#endif
#include <features.h>
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#ifdef __XLT_OS__
#undef NULL
#endif
#ifdef __cplusplus
#define NULL 0L
#else
#define NULL ((void*)0)
#endif
#define __NEED_size_t
#define __NEED_ssize_t
#define __NEED_uid_t
#define __NEED_gid_t
#define __NEED_off_t
#define __NEED_pid_t
#define __NEED_intptr_t
#define __NEED_useconds_t
#ifdef __XLT_OS__
#define __NEED_int64_t
#endif
#include <bits/alltypes.h>
int pipe(int [2]);
int pipe2(int [2], int);
/**
* @ingroup unistd
*
* @par Description:
* The close() function shall close a file descriptor, so that it no longer refers to any file and may be reused.
* Any record locks held on the file it was associated with, and owned by the process, are removed.
* If fd is the last copy of a particular file descriptor the resources associated with it are freed;
* if the descriptor was the last reference to a file which has been removed using unlink() the file is deleted.
*
* @param __fd [IN] file descriptor to close.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #0 close file successful.
* @retval #-1 An error is encountered and close file failed.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: The __fd argument is not a open file descriptor, or value is not within valid range.</li>
* <li><b>ENOENT</b>: Can't find volume in fat or can't find internal node in jffs.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* <li><b>ENODEV</b>: The partition of disk can't find.</li>
* <li><b>EPERM</b>: Other errors.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see dup | fclose | fopen | ioctl | open | unlink
* @since Huawei LiteOS V100R001C00
*/
int close(int);
int posix_close(int, int);
/**
* @ingroup unistd
*
* @par Description:
* The dup() function shall duplicate an open file descriptor. It provides an alternative interface
* to the service provided by fcntl() using the F_DUPFD command. The call dup(fildes) shall be equivalent to:
* fcntl(fildes, F_DUPFD, 0);
*
* @param __oldfd [IN] file descriptor to duplicate.
*
* @attention
* <ul>
* <li>The dup() function doesn't support to duplicate a socket descriptor.</li>
* </ul>
*
* @retval #int A non-negative integer namely the file descriptor shall be returned upon successful completion.
* @retval #-1 An error is encountered and duplicate file descriptor failed.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: __oldfd is not a valid open file descriptor, or it is a socket descriptor.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EMFILE</b>: Too many open files and allocate a file descriptor failed.</li>
* <li><b>ENOENT</b>: Can't find the inode by the pathname associated with __oldfd.</li>
* <li><b>ENOSYS</b>: The current file system doesn't support the dup() function.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see close | fcntl | open
* @since Huawei LiteOS V100R001C00
*/
int dup(int);
/**
* @ingroup unistd
*
* @par Description:
* The dup2() function shall cause the file descriptor __newfd to refer to the same open file description
* as the file descriptor __oldfd and to share any locks, and shall return __newfd.
* If __newfd is already a valid open file descriptor, it shall be closed first, unless __oldfd is equal to __newfd
* in which case dup2() shall return __newfd without closing it.
*
* @attention
* <ul>
* <li>The dup2() function doesn't support to clone a socket descriptor.</li>
* <li>If __newfd is already a valid opend descriptor, it shall be closed first, even if the file system doesn't
* support dup2().</li>
* </ul>
*
* @retval #int A non-negative integer namely the file descriptor shall be returned upon successful completion.
* @retval #-1 An error is encountered and duplicate file descriptor failed.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: __oldfd is not a valid open file descriptor, or it is a socket descriptor.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>ENOENT</b>: Can't find the inode by the pathname associated with __oldfd.</li>
* <li><b>EINTR</b>: The dup2() function was interrupted by a signal.</li>
* <li><b>ENOSYS</b>: The current file system doesn't support the dup() function.</li>
* <li><b>ENODEV</b>: The mount is not healthy or no such device.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see close | fcntl | open
* @since Huawei LiteOS V100R001C00
*/
int dup2(int, int);
int dup3(int, int, int);
off_t lseek(int, off_t, int);
/**
* @ingroup unistd
*
* @par Description:
* The fsync() function shall request that all data for the open file descriptor named by fildes is to
* be transferred to the storage device associated with the file described by fildes.
* The nature of the transfer is implementation-defined. The fsync() function shall not return until
* the system has completed that action or until an error is detected.
*
* @param __fd [IN] An open file descriptor that refers to a device.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #int The fsync() function shall return 0 upon successful completion.
* Otherwise, the function shall return -1 and set errno.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: The __fd argument is not a valid open file descriptor.</li>
* <li><b>ENOSYS</b>: The function is not supported.</li>
* <li><b>EINVAL</b>: The __fd argument is not valid for this device.</li>
* <li><b>ENOENT</b>: The file can't found.</li>
* <li><b>ENODEV</b>: The device is not existed.</li>
* <li><b>EACCES</b>: The file permission is denied.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see sync
* @since Huawei LiteOS V100R001C00
*/
int fsync(int);
int fdatasync(int);
/**
* @ingroup unistd
*
* @par Description:
* The read() function shall attempt to read __count bytes from the file associated with the open file descriptor,
* __fd, into the buffer pointed to by __buf.
*
* @param __fd [IN] file descriptor (or socket descriptor) to read from
* @param __buf [IN/OUT] user-provided to save the data
* @param __count [IN] The maximum size of the user-provided buffer
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #ssize_t A positive non-zero number of bytes read on success.
* @retval #0 End-of-file.
* @retval #-1 On failure with errno set appropriately.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: __fd is not a valid open file descriptor, or the file system doesn't support read().</li>
* <li><b>EFAULT</b>: __buf is outside your accessible address space.</li>
* <li><b>EACCES</b>: The file is a write-only file.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EINVAL</b>: __count is greater than {YAFFS_MAX_FILE_SIZE} in yaffs filesystem.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see fcntl | ioctl | lseek | open | readv
* @since Huawei LiteOS V100R001C00
*/
ssize_t read(int, void *, size_t);
/**
* @ingroup unistd
*
* @par Description:
* The write() function shall attempt to write __count bytes from the buffer pointed to by __buf to the file
* associated with the open file descriptor, __fd.
*
* @param __fd [IN] file descriptor (or socket descriptor) to write to
* @param __buf [IN] Data to write
* @param __count [IN] Length of data to write
*
* @attention
* <ul>
* <li>On a regular file or other file capable of seeking, the actual writing of data shall proceed from the position
* in the file indicated by the file offset associated with fildes. Before successful return from write(), the file
* offset shall be incremented by the number of bytes actually written. On a regular file, if the position
* of the last byte written is greater than or equal to the length of the file, the length of the file shall be
* set to this position plus one.</li>
* <li>If the O_APPEND flag of the file status flags is set, the file offset shall be set to the end of the file
* prior to each write and no intervening file modification operation shall occur between changing the file offset
* and the write operation.</li>
* </ul>
*
* @retval #ssize_t On success, the number of bytes written are returned (zero indicates nothing was written).
* @retval #-1 On error, -1 is returned, and errno is set appropriately.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: __fd is not a valid open file descriptor, or the file system doesn't support write().</li>
* <li><b>EFAULT</b>: __buf is outside your accessible address space.</li>
* <li><b>EACCES/EROFS</b>: The file is a read-only file or the file system is read-only.</li>
* <li><b>EIO</b>: A physical I/O error has occurred.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EINTR</b>: The write operation was terminated due to the receipt of a signal, no data was transferred.</li>
* <li><b>ENOSPC</b>: There was no free space remaining on the device containing the file.</li>
* <li><b>EAGAIN</b>: Non-blocking I/O has been selected using O_NONBLOCK and the write would block.</li>
* <li><b>EFBIG</b>: An attempt was made to write a file that exceeds the implementation defined maximum file
* size or the process' file size limit, or to write at a position past the maximum allowed offset.</li>
* <li><b>EINVAL</b>: The current position of file is less than zero.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see fcntl | ioctl | lseek | open | readv
* @since Huawei LiteOS V100R001C00
*/
ssize_t write(int, const void *, size_t);
/**
* @ingroup unistd
*
* @par Description:
* The pread() function shall be equivalent to read(), except that it shall read from a given position in the file
* without changing the file offset. The first three arguments to pread() are the same as read() with the addition
* of a fourth argument __offset for the desired position inside the file. An attempt to perform a pread() on a file
* that is incapable of seeking shall result in an error.
*
* @param __fd [IN] file descriptor (or socket descriptor) to read from
* @param __buf [IN/OUT] user-provided to save the data
* @param __count [IN] The maximum size of the user-provided buffer
* @param __offset [IN] The file offset
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #ssize_t A positive non-zero number of bytes read on success.
* @retval #0 End-of-file.
* @retval #-1 On failure with errno set appropriately.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: __fd is not a valid open file descriptor, or the file system doesn't support read().</li>
* <li><b>EFAULT</b>: __buf is outside your accessible address space.</li>
* <li><b>EACCES</b>: The file is a write-only file.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EINVAL</b>: __count is greater than {YAFFS_MAX_FILE_SIZE} in yaffs filesystem.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see fcntl | ioctl | lseek | open | readv
* @since Huawei LiteOS V100R001C00
*/
ssize_t pread(int, void *, size_t, off_t);
/**
* @ingroup unistd
*
* @par Description:
* The pwrite() function shall be equivalent to write(), except that it writes into a given position
* and does not change the file offset (regardless of whether O_APPEND is set). The first three arguments to pwrite()
* are the same as write() with the addition of a fourth argument __offset for the desired position inside the file.
* An attempt to perform a pwrite() on a file that is incapable of seeking shall result in an error.
*
* @param __fd [IN] file descriptor (or socket descriptor) to write to
* @param __buf [IN] Data to write
* @param __count [IN] Length of data to write
* @param __offset [IN] The file offset to write from
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #ssize_t On success, the number of bytes written are returned (zero indicates nothing was written).
* @retval #-1 On error, -1 is returned, and errno is set appropriately.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: __fd is not a valid open file descriptor, or the file system doesn't support write().</li>
* <li><b>EFAULT</b>: __buf is outside your accessible address space.</li>
* <li><b>EACCES/EROFS</b>: The file is a read-only file or the file system is read-only.</li>
* <li><b>EIO</b>: A physical I/O error has occurred.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EINTR</b>: The write operation was terminated due to the receipt of a signal, no data was transferred.</li>
* <li><b>ENOSPC</b>: There was no free space remaining on the device containing the file.</li>
* <li><b>EAGAIN</b>: Non-blocking I/O has been selected using O_NONBLOCK and the write would block.</li>
* <li><b>EFBIG</b>: An attempt was made to write a file that exceeds the implementation defined maximum file
* size or the process' file size limit, or to write at a position past the maximum allowed offset.</li>
* <li><b>EINVAL</b>: The current position of file is less than zero.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see fcntl | ioctl | lseek | open | readv
* @since Huawei LiteOS V100R001C00
*/
ssize_t pwrite(int, const void *, size_t, off_t);
int chown(const char *, uid_t, gid_t);
int fchown(int, uid_t, gid_t);
int lchown(const char *, uid_t, gid_t);
int fchownat(int, const char *, uid_t, gid_t, int);
int link(const char *, const char *);
int linkat(int, const char *, int, const char *, int);
int symlink(const char *, const char *);
int symlinkat(const char *, int, const char *);
ssize_t readlink(const char *__restrict, char *__restrict, size_t);
ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t);
/**
* @ingroup unistd
*
* @par Description:
* The unlink() function shall remove a link to file. When the file's link count becomes 0 and no process
* has the file open, the space occupied by the file shall be freed and the file shall no longer be accessible.
* If one or more processes have the file open when the last link is removed, the link shall be removed before unlink() returns,
* but the removal of the file contents shall be postponed until all references to the file are closed.
*
* @param __path [IN] path of the file which need to be removed, shall not name a directory.
*
* @attention
* <ul>
* <li>If the unlink() function is called to remove a file in /dev, it shall just call the registered unlink hook function
* the file will still alive and won't be removed.</li>
* </ul>
*
* @retval #int Upon successful completion, these functions shall return 0.
* Otherwise, these functions shall return -1 and set errno to indicate the error.
* If -1 is returned, the named file shall not be changed.
*
*
* @par Errors
* <ul>
* <li><b>EACCES</b>: Search permission is denied for a component of the path prefix,
* or write permission is denied on the directory containing the directory entry to be removed,
* or remove a file in /dev which doesn't register the unlink function.</li>
* <li><b>ENAMETOOLONG</b>: The length of a component of a pathname is longer than {NAME_MAX}.</li>
* <li><b>ENOTEMPTY</b>: unlink a pseudo-file which is functioning as a directory and the directory is not empty.</li>
* <li><b>ENOENT</b>: A component of path does not name an existing file.</li>
* <li><b>EINVAL</b>: The path is not valid.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EISDIR</b>: The path is a directory.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see close | remove | rename | rmdir
* @since Huawei LiteOS V100R001C00
*/
int unlink(const char *);
int unlinkat(int, const char *, int);
/**
* @ingroup unistd
*
* @par Description:
* The rmdir() function shall remove a directory whose name is given by __path.
* The directory shall be removed only if it is an empty directory.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #0 Remove directory successful.
* @retval #-1 An error is encountered and remove the directory failed.
*
* @par Errors
* <ul>
* <li><b>EINVAL</b>: The path is a null pointer or an empty string.</li>
* <li><b>ENAMETOOLONG</b>: The length of a component of a pathname is longer than {NAME_MAX}.</li>
* <li><b>ENOENT</b>: A component of the path does not exist.</li>
* <li><b>EPERM</b>: The path represent a mount point, or the path is neither a directory nor a file.</li>
* <li><b>ENOTEMPTY</b>: The path argument names a directory that is not an empty directory.</li>
* <li><b>ENOTDIR</b>: A component of path names an existing file instead of a directory.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* <li><b>EROFS</b>: The physical drive is write protected with fat filesystem.</li>
* <li><b>EACCES</b>: The directory entry to be removed resides on a read-only file system, or remove a directory
* in proc.</li>
* <li><b>EBUSY</b>: Remove a root of file system, or the directory is not empty of ramfs.</li>
* <li><b>ENOSYS
</b>: The file system doesn't support to rmdir.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see mkdir | remove | rename | unlink
* @since Huawei LiteOS V100R001C00
*/
int rmdir(const char *);
int truncate(const char *, off_t);
/**
* @ingroup unistd
*
* @par Description:
* The ftruncate() function truncates the file size to the length bytes.
* If the file previously was larger than this size, the extra data is lost.
* If the file previously was shorter, it is extended, and the extended part reads as disk data.
* @attention
* <ul>
* <li>Now only FAT32 support this function.</li>
* </ul>
*
* @retval #int The ftruncate() function shall return 0 upon successful completion.
* Otherwise, the function shall return -1 and set errno.
*
* @par Errors
* <ul>
* <li><b>EBADF</b>: The __fd argument is not a valid open file descriptor.</li>
* <li><b>ENOSYS</b>: The function is not supported.</li>
* <li><b>EINVAL</b>: The length argument was less than 0 or
* The length argument was greater than the maximum file size.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* <li><b>EACCES</b>: The file permission is denied.</li>
* <li><b>ENODEV</b>: The device is not existed.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see fallocate
* @since Huawei LiteOS V100R001C00
*/
int ftruncate(int, off_t);
#define F_OK 0
#define R_OK 4
#define W_OK 2
#define X_OK 1
/**
* @ingroup unistd
*
* @par Description:
* The access() function shall check the file named by the pathname pointed to by the __path argument
* for accessibility according to the bit pattern contained in __mode.
*
* @param __path [IN] path of the file which need to be checked.
* @param __mode [IN] The value of __mode is either the bitwise-inclusive OR of the access permissions to be checked
* (R_OK, W_OK, X_OK) or the existence test (F_OK).
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #int The access() function shall return 0 upon successful completion.
* Otherwise, the function shall return -1 and set errno.
*
* @par Errors
* <ul>
* <li><b>EACCES</b>: Permission bits of the file mode do not permit the requested access,
* or search permission is denied on a component of the path prefix.</li>
* <li><b>ENAMETOOLONG</b>: The length of a component of a pathname is longer than {NAME_MAX}.</li>
* <li><b>EFAULT</b>: Bad address.</li>
* <li><b>ENOENT</b>: A component of the path does not exist, or the path is an empty string.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>ENOTDIR</b>: A component of the path is not a directory.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see None
* @since Huawei LiteOS V100R001C00
*/
int access(const char *, int);
int faccessat(int, const char *, int, int);
/**
* @ingroup unistd
*
* @par Description:
* The chdir() function shall cause the directory named by the pathname pointed to by the __path argument to become
* the current working directory; that is, the starting point for path searches for pathnames not beginning with '/'.
*
* @param __path [IN] path of the file which need to be set as the current working directory.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #int Upon successful completion, 0 shall be returned.
* Otherwise, -1 shall be returned, the current working directory shall remain unchanged,
* and errno shall be set to indicate the error.
*
* @par Errors
* <ul>
* <li><b>EINVAL</b>: The path is an empty string.</li>
* <li><b>ENAMETOOLONG</b>: The length of a component of a pathname is longer than {NAME_MAX}.</li>
* <li><b>ENOENT</b>: A component of the path does not exist,
* or length of __path is longer than {PATH_MAX}.</li>
* <li><b>ENOMEM</b>: Out of memory.</li>
* <li><b>ENOSPC</b>: Out of memory in ramfs filesystem.</li>
* <li><b>ENOTDIR</b>: A component of the path is not a directory.</li>
* <li><b>EMFILE</b>: Too many open file.</li>
* <li><b>EROFS</b>: The physical drive is write protected with fat filesystem.</li>
* <li><b>EIO</b>: A hard error occurred in the low level disk I/O layer or the physical drive cannot work.</li>
* <li><b>ENODEV</b>: The mount is not healthy.</li>
* <li><b>EPERM</b>: Other errors.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see getcwd
* @since Huawei LiteOS V100R001C00
*/
int chdir(const char *);
int fchdir(int);
/**
* @ingroup unistd
*
* @par Description:
* The getcwd() function shall place an absolute pathname of the current working directory
* in the array pointed to by __buf, and return __buf.
*
* @param __buf [IN/OUT] Point to an array which place an absolute pathname of the current working directory and return.
* @param __size [IN] The size in bytes of the character array pointed to by the __buf argument.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #char* Return the __buf argument if upon successful completion.
* @retval #NULL An error is encountered and the contents of the array pointed to by __buf are undefined.
*
* @par Errors
* <ul>
* <li><b>EINVAL</b>: The __buf is a NULL pointer.</li>
* <li><b>ERANGE</b>: The size argument is smaller than the length of the current working directory name + 1.</li>
* <li><b>ENAMETOOLONG</b>: Use memcpy_s to copy the current working directory name to __buf failed.</li>
* </ul>
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see malloc
* @since Huawei LiteOS V100R001C00
*/
char *getcwd(char *, size_t);
unsigned alarm(unsigned);
/**
* @ingroup unistd
*
* @par Description:
* The sleep() function shall cause the calling thread to be suspended from execution until either the number of
* realtime seconds specified by the argument __seconds has elapsed or a signal is delivered to the calling thread
* and its action is to invoke a signal-catching function or to terminate the process.
* The suspension time may be longer than requested due to the scheduling of other activity by the system.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #0 The requested time has elapsed.
* @retval #unsigned int An error is encountered in LOS_TaskDelay() and the __seconds shall be returned.
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see nanosleep
* @since Huawei LiteOS V100R001C00
*/
unsigned sleep(unsigned);
int pause(void);
pid_t fork(void);
int execve(const char *, char *const [], char *const []);
int execv(const char *, char *const []);
int execle(const char *, const char *, ...);
int execl(const char *, const char *, ...);
int execvp(const char *, char *const []);
int execlp(const char *, const char *, ...);
int fexecve(int, char *const [], char *const []);
_Noreturn void _exit(int);
/**
* @ingroup unistd
*
* @par Description:
* The getpid() function get the process ID of the calling process.
*
* @attention
* <ul>
* <li>None.</li>
* </ul>
*
* @retval #int The getpid() function shall return the process ID of the calling process.
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see None
* @since Huawei LiteOS V100R001C00
*/
pid_t getpid(void);
pid_t getppid(void);
pid_t getpgrp(void);
pid_t getpgid(pid_t);
int setpgid(pid_t, pid_t);
pid_t setsid(void);
pid_t getsid(pid_t);
char *ttyname(int);
int ttyname_r(int, char *, size_t);
int isatty(int);
pid_t tcgetpgrp(int);
int tcsetpgrp(int, pid_t);
uid_t getuid(void);
uid_t geteuid(void);
gid_t getgid(void);
gid_t getegid(void);
int getgroups(int, gid_t []);
int setuid(uid_t);
int seteuid(uid_t);
int setgid(gid_t);
int setegid(gid_t);
char *getlogin(void);
int getlogin_r(char *, size_t);
int gethostname(char *, size_t);
char *ctermid(char *);
int getopt(int, char * const [], const char *);
extern char *optarg;
extern int optind, opterr, optopt;
long pathconf(const char *, int);
long fpathconf(int, int);
long sysconf(int);
size_t confstr(int, char *, size_t);
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define F_ULOCK 0
#define F_LOCK 1
#define F_TLOCK 2
#define F_TEST 3
int setreuid(uid_t, uid_t);
int setregid(gid_t, gid_t);
int lockf(int, int, off_t);
long gethostid(void);
int nice(int);
/**
* @ingroup unistd
*
* @par Description:
* The sync() function shall request that all data in bcache to be transferred to the storage device for disk 0 and 1.
*
* @attention
* <ul>
* <li>The sync() function in liteos can only flush all data in bcache into storage device, but can't flush
* the data in memory, and it shall not return until the system completed that action or until an error is detected.
* But in POSIX, The sync() function shall cause all information in memory that updates file systems to be scheduled
* for writing out to all file systems, and the writing, although scheduled, is not necessarily complete
* upon return from sync().</li>
* <li>The sync() function is only useful for fat filesystem and the bcache shall be enabled,
* other filesystems don't need to sync.</li>
* <li>The sync() function
* </ul>
*
* @retval #void None.
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see fsync
* @since Huawei LiteOS V100R001C00
*/
void sync(void);
pid_t setpgrp(void);
char *crypt(const char *, const char *);
void encrypt(char *, int);
void swab(const void *__restrict, void *__restrict, ssize_t);
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) \
|| (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE+0 < 700)
/**
* @ingroup unistd
*
* @par Description:
* The usleep() function shall cause the calling thread to be suspended from execution until either the number of
* microsecond specified by the argument __usec has elapsed or a signal is delivered to the calling thread
* and its action is to invoke a signal-catching function or to terminate the process.
* The suspension time may be longer than requested due to the scheduling of other activity by the system.
*
* @attention
* <ul>
* <li>If __usec is less than per Millisecond and is not equal to zero,
* the suspended time shall be set to 1 millisecond.</li>
* <li>The realtime to sleep is __usec/1000 millisecond.</li>
* </ul>
*
* @retval #0 The requested time has elapsed.
* @retval #-1 An error is encountered in LOS_TaskDelay().
*
* @par Dependency:
* <ul><li>unistd.h</li></ul>
* @see sleep
* @since Huawei LiteOS V100R001C00
*/
int usleep(unsigned);
unsigned ualarm(unsigned, unsigned);
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define L_SET 0
#define L_INCR 1
#define L_XTND 2
int brk(void *);
void *sbrk(intptr_t);
pid_t vfork(void);
int vhangup(void);
int chroot(const char *);
int getpagesize(void);
int getdtablesize(void);
int sethostname(const char *, size_t);
int getdomainname(char *, size_t);
int setdomainname(const char *, size_t);
int setgroups(size_t, const gid_t *);
char *getpass(const char *);
int daemon(int, int);
void setusershell(void);
void endusershell(void);
char *getusershell(void);
int acct(const char *);
long syscall(long, ...);
int execvpe(const char *, char *const [], char *const []);
int issetugid(void);
int getentropy(void *, size_t);
extern int optreset;
#endif
#ifdef _GNU_SOURCE
extern char **environ;
int setresuid(uid_t, uid_t, uid_t);
int setresgid(gid_t, gid_t, gid_t);
int getresuid(uid_t *, uid_t *, uid_t *);
int getresgid(gid_t *, gid_t *, gid_t *);
char *get_current_dir_name(void);
int syncfs(int);
int euidaccess(const char *, int);
int eaccess(const char *, int);
ssize_t copy_file_range(int, off_t *, int, off_t *, size_t, unsigned);
#endif
#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
#ifdef __XLT_OS__
#define off64_t int64_t
off64_t lseek64(int, off64_t, int);
ssize_t pread64(int, void *, size_t, off64_t);
ssize_t pwrite64(int, const void *, size_t, off64_t);
int truncate64(const char *, off64_t);
int ftruncate64(int, off64_t);
int lockf64(int, int, off64_t);
#else
#define lseek64 lseek
#define pread64 pread
#define pwrite64 pwrite
#define truncate64 truncate
#define ftruncate64 ftruncate
#define lockf64 lockf
#define off64_t off_t
#endif
#endif
#define POSIX_CLOSE_RESTART 0
#define _XOPEN_VERSION 700
#define _XOPEN_UNIX 1
#define _XOPEN_ENH_I18N 1
#define _POSIX_VERSION 200809L
#define _POSIX2_VERSION _POSIX_VERSION
#define _POSIX_ADVISORY_INFO _POSIX_VERSION
#define _POSIX_CHOWN_RESTRICTED 1
#define _POSIX_IPV6 _POSIX_VERSION
#define _POSIX_JOB_CONTROL 1
#define _POSIX_MAPPED_FILES _POSIX_VERSION
#define _POSIX_MEMLOCK _POSIX_VERSION
#define _POSIX_MEMLOCK_RANGE _POSIX_VERSION
#define _POSIX_MEMORY_PROTECTION _POSIX_VERSION
#define _POSIX_MESSAGE_PASSING _POSIX_VERSION
#define _POSIX_FSYNC _POSIX_VERSION
#define _POSIX_NO_TRUNC 1
#define _POSIX_RAW_SOCKETS _POSIX_VERSION
#define _POSIX_REALTIME_SIGNALS _POSIX_VERSION
#define _POSIX_REGEXP 1
#define _POSIX_SAVED_IDS 1
#define _POSIX_SHELL 1
#define _POSIX_SPAWN _POSIX_VERSION
#define _POSIX_VDISABLE 0
#define _POSIX_THREADS _POSIX_VERSION
#define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
#define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
#define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
#define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
#define _POSIX_THREAD_CPUTIME _POSIX_VERSION
#define _POSIX_TIMERS _POSIX_VERSION
#define _POSIX_TIMEOUTS _POSIX_VERSION
#define _POSIX_MONOTONIC_CLOCK _POSIX_VERSION
#define _POSIX_CPUTIME _POSIX_VERSION
#define _POSIX_CLOCK_SELECTION _POSIX_VERSION
#define _POSIX_BARRIERS _POSIX_VERSION
#define _POSIX_SPIN_LOCKS _POSIX_VERSION
#define _POSIX_READER_WRITER_LOCKS _POSIX_VERSION
#define _POSIX_ASYNCHRONOUS_IO _POSIX_VERSION
#define _POSIX_SEMAPHORES _POSIX_VERSION
#define _POSIX_SHARED_MEMORY_OBJECTS _POSIX_VERSION
#define _POSIX2_C_BIND _POSIX_VERSION
#include <bits/posix.h>
#define _PC_LINK_MAX 0
#define _PC_MAX_CANON 1
#define _PC_MAX_INPUT 2
#define _PC_NAME_MAX 3
#define _PC_PATH_MAX 4
#define _PC_PIPE_BUF 5
#define _PC_CHOWN_RESTRICTED 6
#define _PC_NO_TRUNC 7
#define _PC_VDISABLE 8
#define _PC_SYNC_IO 9
#define _PC_ASYNC_IO 10
#define _PC_PRIO_IO 11
#define _PC_SOCK_MAXBUF 12
#define _PC_FILESIZEBITS 13
#define _PC_REC_INCR_XFER_SIZE 14
#define _PC_REC_MAX_XFER_SIZE 15
#define _PC_REC_MIN_XFER_SIZE 16
#define _PC_REC_XFER_ALIGN 17
#define _PC_ALLOC_SIZE_MIN 18
#define _PC_SYMLINK_MAX 19
#define _PC_2_SYMLINKS 20
#define _SC_ARG_MAX 0
#define _SC_CHILD_MAX 1
#define _SC_CLK_TCK 2
#define _SC_NGROUPS_MAX 3
#define _SC_OPEN_MAX 4
#define _SC_STREAM_MAX 5
#define _SC_TZNAME_MAX 6
#define _SC_JOB_CONTROL 7
#define _SC_SAVED_IDS 8
#define _SC_REALTIME_SIGNALS 9
#define _SC_PRIORITY_SCHEDULING 10
#define _SC_TIMERS 11
#define _SC_ASYNCHRONOUS_IO 12
#define _SC_PRIORITIZED_IO 13
#define _SC_SYNCHRONIZED_IO 14
#define _SC_FSYNC 15
#define _SC_MAPPED_FILES 16
#define _SC_MEMLOCK 17
#define _SC_MEMLOCK_RANGE 18
#define _SC_MEMORY_PROTECTION 19
#define _SC_MESSAGE_PASSING 20
#define _SC_SEMAPHORES 21
#define _SC_SHARED_MEMORY_OBJECTS 22
#define _SC_AIO_LISTIO_MAX 23
#define _SC_AIO_MAX 24
#define _SC_AIO_PRIO_DELTA_MAX 25
#define _SC_DELAYTIMER_MAX 26
#define _SC_MQ_OPEN_MAX 27
#define _SC_MQ_PRIO_MAX 28
#define _SC_VERSION 29
#define _SC_PAGE_SIZE 30
#define _SC_PAGESIZE 30 /* !! */
#define _SC_RTSIG_MAX 31
#define _SC_SEM_NSEMS_MAX 32
#define _SC_SEM_VALUE_MAX 33
#define _SC_SIGQUEUE_MAX 34
#define _SC_TIMER_MAX 35
#define _SC_BC_BASE_MAX 36
#define _SC_BC_DIM_MAX 37
#define _SC_BC_SCALE_MAX 38
#define _SC_BC_STRING_MAX 39
#define _SC_COLL_WEIGHTS_MAX 40
#define _SC_EXPR_NEST_MAX 42
#define _SC_LINE_MAX 43
#define _SC_RE_DUP_MAX 44
#define _SC_2_VERSION 46
#define _SC_2_C_BIND 47
#define _SC_2_C_DEV 48
#define _SC_2_FORT_DEV 49
#define _SC_2_FORT_RUN 50
#define _SC_2_SW_DEV 51
#define _SC_2_LOCALEDEF 52
#define _SC_UIO_MAXIOV 60 /* !! */
#define _SC_IOV_MAX 60
#define _SC_THREADS 67
#define _SC_THREAD_SAFE_FUNCTIONS 68
#define _SC_GETGR_R_SIZE_MAX 69
#define _SC_GETPW_R_SIZE_MAX 70
#define _SC_LOGIN_NAME_MAX 71
#define _SC_TTY_NAME_MAX 72
#define _SC_THREAD_DESTRUCTOR_ITERATIONS 73
#define _SC_THREAD_KEYS_MAX 74
#define _SC_THREAD_STACK_MIN 75
#define _SC_THREAD_THREADS_MAX 76
#define _SC_THREAD_ATTR_STACKADDR 77
#define _SC_THREAD_ATTR_STACKSIZE 78
#define _SC_THREAD_PRIORITY_SCHEDULING 79
#define _SC_THREAD_PRIO_INHERIT 80
#define _SC_THREAD_PRIO_PROTECT 81
#define _SC_THREAD_PROCESS_SHARED 82
#define _SC_NPROCESSORS_CONF 83
#define _SC_NPROCESSORS_ONLN 84
#define _SC_PHYS_PAGES 85
#define _SC_AVPHYS_PAGES 86
#define _SC_ATEXIT_MAX 87
#define _SC_PASS_MAX 88
#define _SC_XOPEN_VERSION 89
#define _SC_XOPEN_XCU_VERSION 90
#define _SC_XOPEN_UNIX 91
#define _SC_XOPEN_CRYPT 92
#define _SC_XOPEN_ENH_I18N 93
#define _SC_XOPEN_SHM 94
#define _SC_2_CHAR_TERM 95
#define _SC_2_UPE 97
#define _SC_XOPEN_XPG2 98
#define _SC_XOPEN_XPG3 99
#define _SC_XOPEN_XPG4 100
#define _SC_NZERO 109
#define _SC_XBS5_ILP32_OFF32 125
#define _SC_XBS5_ILP32_OFFBIG 126
#define _SC_XBS5_LP64_OFF64 127
#define _SC_XBS5_LPBIG_OFFBIG 128
#define _SC_XOPEN_LEGACY 129
#define _SC_XOPEN_REALTIME 130
#define _SC_XOPEN_REALTIME_THREADS 131
#define _SC_ADVISORY_INFO 132
#define _SC_BARRIERS 133
#define _SC_CLOCK_SELECTION 137
#define _SC_CPUTIME 138
#define _SC_THREAD_CPUTIME 139
#define _SC_MONOTONIC_CLOCK 149
#define _SC_READER_WRITER_LOCKS 153
#define _SC_SPIN_LOCKS 154
#define _SC_REGEXP 155
#define _SC_SHELL 157
#define _SC_SPAWN 159
#define _SC_SPORADIC_SERVER 160
#define _SC_THREAD_SPORADIC_SERVER 161
#define _SC_TIMEOUTS 164
#define _SC_TYPED_MEMORY_OBJECTS 165
#define _SC_2_PBS 168
#define _SC_2_PBS_ACCOUNTING 169
#define _SC_2_PBS_LOCATE 170
#define _SC_2_PBS_MESSAGE 171
#define _SC_2_PBS_TRACK 172
#define _SC_SYMLOOP_MAX 173
#define _SC_STREAMS 174
#define _SC_2_PBS_CHECKPOINT 175
#define _SC_V6_ILP32_OFF32 176
#define _SC_V6_ILP32_OFFBIG 177
#define _SC_V6_LP64_OFF64 178
#define _SC_V6_LPBIG_OFFBIG 179
#define _SC_HOST_NAME_MAX 180
#define _SC_TRACE 181
#define _SC_TRACE_EVENT_FILTER 182
#define _SC_TRACE_INHERIT 183
#define _SC_TRACE_LOG 184
#define _SC_IPV6 235
#define _SC_RAW_SOCKETS 236
#define _SC_V7_ILP32_OFF32 237
#define _SC_V7_ILP32_OFFBIG 238
#define _SC_V7_LP64_OFF64 239
#define _SC_V7_LPBIG_OFFBIG 240
#define _SC_SS_REPL_MAX 241
#define _SC_TRACE_EVENT_NAME_MAX 242
#define _SC_TRACE_NAME_MAX 243
#define _SC_TRACE_SYS_MAX 244
#define _SC_TRACE_USER_EVENT_MAX 245
#define _SC_XOPEN_STREAMS 246
#define _SC_THREAD_ROBUST_PRIO_INHERIT 247
#define _SC_THREAD_ROBUST_PRIO_PROTECT 248
#define _CS_PATH 0
#define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS 1
#define _CS_GNU_LIBC_VERSION 2
#define _CS_GNU_LIBPTHREAD_VERSION 3
#define _CS_POSIX_V5_WIDTH_RESTRICTED_ENVS 4
#define _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS 5
#define _CS_POSIX_V6_ILP32_OFF32_CFLAGS 1116
#define _CS_POSIX_V6_ILP32_OFF32_LDFLAGS 1117
#define _CS_POSIX_V6_ILP32_OFF32_LIBS 1118
#define _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS 1119
#define _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS 1120
#define _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS 1121
#define _CS_POSIX_V6_ILP32_OFFBIG_LIBS 1122
#define _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS 1123
#define _CS_POSIX_V6_LP64_OFF64_CFLAGS 1124
#define _CS_POSIX_V6_LP64_OFF64_LDFLAGS 1125
#define _CS_POSIX_V6_LP64_OFF64_LIBS 1126
#define _CS_POSIX_V6_LP64_OFF64_LINTFLAGS 1127
#define _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS 1128
#define _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS 1129
#define _CS_POSIX_V6_LPBIG_OFFBIG_LIBS 1130
#define _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS 1131
#define _CS_POSIX_V7_ILP32_OFF32_CFLAGS 1132
#define _CS_POSIX_V7_ILP32_OFF32_LDFLAGS 1133
#define _CS_POSIX_V7_ILP32_OFF32_LIBS 1134
#define _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS 1135
#define _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS 1136
#define _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS 1137
#define _CS_POSIX_V7_ILP32_OFFBIG_LIBS 1138
#define _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS 1139
#define _CS_POSIX_V7_LP64_OFF64_CFLAGS 1140
#define _CS_POSIX_V7_LP64_OFF64_LDFLAGS 1141
#define _CS_POSIX_V7_LP64_OFF64_LIBS 1142
#define _CS_POSIX_V7_LP64_OFF64_LINTFLAGS 1143
#define _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS 1144
#define _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS 1145
#define _CS_POSIX_V7_LPBIG_OFFBIG_LIBS 1146
#define _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS 1147
#define _CS_V6_ENV 1148
#define _CS_V7_ENV 1149
#ifdef __cplusplus
}
#endif
#endif