1 /* 2 * Copyright (c) 2006-2022, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2020-12-16 Meco Man add usleep 9 * 2021-09-11 Meco Man move functions from dfs_posix.h to unistd.h 10 */ 11 12 #ifndef __SYS_UNISTD_H__ 13 #define __SYS_UNISTD_H__ 14 15 #include <stddef.h> 16 #include <sys/types.h> 17 18 #ifdef __cplusplus 19 extern "C" { 20 #endif 21 22 #define _POSIX_VDISABLE 0 23 24 #define STDIN_FILENO 0 /* standard input file descriptor */ 25 #define STDOUT_FILENO 1 /* standard output file descriptor */ 26 #define STDERR_FILENO 2 /* standard error file descriptor */ 27 28 #define F_OK 0 29 #define X_OK 1 30 #define W_OK 2 31 #define R_OK 4 32 33 unsigned alarm(unsigned __secs); 34 ssize_t read(int fd, void *buf, size_t len); 35 ssize_t write(int fd, const void *buf, size_t len); 36 off_t lseek(int fd, off_t offset, int whence); 37 int pause(void); 38 int fsync(int fildes); 39 long sysconf(int __name); 40 int unlink(const char *pathname); 41 int close(int d); 42 int ftruncate(int fd, off_t length); 43 int rmdir(const char *path); 44 int chdir(const char *path); 45 char *getcwd(char *buf, size_t size); 46 int access(const char *path, int amode); 47 int pipe(int fildes[2]); 48 int isatty(int fd); 49 char *ttyname(int desc); 50 unsigned int sleep(unsigned int seconds); 51 int usleep(useconds_t usec); 52 pid_t gettid(void); 53 pid_t getpid(void); 54 pid_t getppid(void); 55 uid_t getuid(void); 56 uid_t geteuid(void); 57 gid_t getgid(void); 58 gid_t getegid(void); 59 60 #ifdef __cplusplus 61 } 62 #endif 63 64 #endif /* _SYS_UNISTD_H */ 65