unistd.h

   1 #include <stddef.h>
   2
   3 /* access() flags */
   4 #define R_OK            4
   5 #define W_OK            2
   6 #define X_OK            1
   7 #define F_OK            0
   8
   9 int access(char *name, int type);
  10 int unlink(char *path);
  11
  12 extern char **environ;
  13
  14 int isatty(int fd);
  15 int close(int fd);
  16 long write(int fd, void *buf, long n);
  17 long read(int fd, void *buf, long n);
  18
  19 /* lseek() whence */
  20 #define SEEK_SET        0
  21 #define SEEK_CUR        1
  22 #define SEEK_END        2
  23
  24 long lseek(int fd, long offset, int whence);
  25
  26 int pipe(int fds[2]);
  27 int dup(int fd);
  28 int dup2(int fd, int fd2);
  29
  30 int fork(void);
  31 int getpid(void);
  32 int getppid(void);
  33
  34 int execve(char *path, char *argv[], char *envp[]);
  35 int execle(char *path, ...);
  36 int execvp(char *file, char *argv[]);
  37 int execv(char *path, char *argv[]);
  38
  39 void _exit(int status);
  40
  41 int sleep(int n);
  42
  43 /* standard file descriptors */
  44 #define STDIN_FILENO    0
  45 #define STDOUT_FILENO   1
  46 #define STDERR_FILENO   2