unistd.h

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#include <bits/confname.h>

/* Standard file descriptors */
#define STDIN_FILENO 0 /* Standard input */
#define STDOUT_FILENO 1 /* Standard output */
#define STDERR_FILENO 2 /* Standard error output */

extern int access(const char *path, int mode);

extern unsigned alarm(unsigned sec);

extern int chdir(const char *path);

extern int chown(const char *path, uid_t uid, gid_t gid);

extern int close(int fd);

extern size_t confstr(int name, char *buf, size_t len);

extern char *crypt(const char *key, const char *salt);

extern char *ctermid(char *s);

extern int dup(int fd);

extern int dup2(int oldfd, int newfd);

extern void _exit(int ret);

extern void encrypt(char block[64], int edflat);

extern int execl(const char *path, const char *arg, ...);

extern int execle(const char *path, const char *arg, ...);

extern int execlp(const char *path, const char *arg, ...);

extern int execv(const char *path, char *const argv[]);

extern int execve(const char *path,
                        const char *const argv[], char *const envp[]);

extern int execvp(const char *path, char *const argv[]);

extern int faccessat(int dirfd, const char *path, int mode, int flag);

extern int fchdir(int fd);

extern int fchown(int fd, uid_t uid, gid_t gid);

extern int fchownat(int dirfd,
                        const char *path, uid_t uid, gid_t gid, int flag);

extern int fdatasync(int fd);

extern int fexecve(int fd, char *const argv[], char *const env[]);

extern pid_t fork(void);

extern long fpathconf(int fd, int name);

extern int fsync(int fd);

extern int ftruncate(int fd, off_t off);

extern char *getcwd(char *buf, size_t size);

extern gid_t getegid(void);

extern uid_t geteuid(void);

extern gid_t getgid(void);

extern int getgroups(int size, gid_t list[]);

extern long gethostid(void);

extern int gethostname(char *buf, size_t size);

extern char *getlogin(void);

extern int getlogin_r(char *buf, size_t size);

extern int getopt(int argc, char *const argv[], const char *optstring);

extern pid_t getpgid(pid_t pid);

extern pid_t getpgrp(void);

extern pid_t getpid(void);

extern pid_t getppid(void);

extern pid_t getsid(pid_t pid);

extern uid_t getuid(void);

extern int isatty(int fd);

extern int lchown(const char *path, uid_t owner, gid_t group);

extern int link(const char *oldpath, const char *newpath);

extern int linkat(int olddirfd, const char *oldname,
                        int newdirfd, const char *newname, int flags);

extern int lockf(int fd, int cmd, off_t len);

extern off_t lseek(int fd, off_t offset, int whence);

extern int nice(int val);

extern long pathconf(const char *path, int name);

extern int pause(void);

extern int pipe(int fds[2]);

extern ssize_t pread(int fd, void *buf, size_t size, off_t offset);

extern ssize_t pwrite(int fd, const void *buf, size_t size, off_t offset);

extern ssize_t read(int fd, void *buf, size_t size);

extern ssize_t readlink(const char *restrict path,
                                char *restrict buf, size_t bufsz);

extern ssize_t readlinkat(int dirfd,
                const char *restrict path, char *restrict buf, size_t size);

extern int rmdir(const char *path);

extern int setegid(gid_t gid);

extern int seteuid(uid_t uid);

extern int setgid(gid_t gid);

extern int setpgid(pid_t pid, pid_t pgid);

extern pid_t setpgrp(void);

extern int setregid(gid_t rgid, gid_t egid);

extern int setreuid(uid_t ruid, uid_t euid);

extern pid_t setsid(void);

extern int setuid(uid_t euid);

extern unsigned sleep(unsigned secs);

extern void swab(const void *restrict from, void *restrict to, ssize_t size);

extern int symlink(const char *oldpath, const char *newpath);

extern int symlinkat(const char *oldpath, int newdirfd, const char *newpath);

extern void sync(void);

extern long sysconf(int name);

extern pid_t tcgetpgrp(int fd);

extern int tcsetpgrp(int fd, pid_t pid);

extern int truncate(const char *file, off_t offset);

extern char *ttyname(int fd);

extern int ttyname_r(int fd, char *buf, size_t size);

extern int unlink(const char *file);

extern int unlinkat(int dirfd, const char *file, int flags);

extern ssize_t write(int fd, const void *buf, size_t size);

extern int brk(void *ptr);

extern void *sbrk(intptr_t increment);

extern char *optarg;
extern int opterr, optind, optopt;
extern char **environ;