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 close(int fd);
  15 long write(int fd, void *buf, long n);
  16 long read(int fd, void *buf, long n);
  17
  18 /* lseek() whence */
  19 #define SEEK_SET        0
  20 #define SEEK_CUR        1
  21 #define SEEK_END        2
  22
  23 long lseek(int fd, long offset, int whence);
  24
  25 int pipe(int fds[2]);
  26 int dup(int fd);
  27 int dup2(int fd, int fd2);
  28
  29 int fork(void);
  30 int getpid(void);
  31 int getppid(void);
  32
  33 int execve(char *path, char *argv[], char *envp[]);
  34 int execle(char *path, ...);
  35 int execvp(char *file, char *argv[]);
  36 int execv(char *path, char *argv[]);
  37
  38 void _exit(int status);
  39
  40 int sleep(int n);
  41
  42 /* standard file descriptors */
  43 #define STDIN_FILENO    0
  44 #define STDOUT_FILENO   1
  45 #define STDERR_FILENO   2