extern "C" {
#endif
+#include <features.h>
+
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
-#undef SEEK_SET
-#undef SEEK_CUR
-#undef SEEK_END
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#define __NEED_gid_t
#define __NEED_off_t
#define __NEED_pid_t
-#define __NEED_useconds_t
#define __NEED_intptr_t
#include <bits/alltypes.h>
int dup2(int, int);
off_t lseek(int, off_t, int);
int fsync(int);
-void sync(void);
int fdatasync(int);
ssize_t read(int, void *, size_t);
ssize_t pread(int, void *, size_t, off_t);
ssize_t pwrite(int, const void *, size_t, off_t);
-#define F_ULOCK 0
-#define F_LOCK 1
-#define F_TLOCK 2
-#define F_TEST 3
-int lockf(int, int, 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 linkat(int, const char *, int, const char *, int);
int symlink(const char *, const char *);
int symlinkat(const char *, int, const char *);
-int readlink(const char *, char *, size_t);
-int readlinkat(int, const char *, char *, size_t);
+ssize_t readlink(const char *__restrict, char *__restrict, size_t);
+ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t);
int unlink(const char *);
int unlinkat(int, const char *, int);
int rmdir(const char *);
#define R_OK 4
#define W_OK 2
#define X_OK 1
+
int access(const char *, int);
int faccessat(int, const char *, int, int);
int chdir(const char *);
int fchdir(int);
char *getcwd(char *, size_t);
-int chroot(const char *); /* dropped */
unsigned alarm(unsigned);
-useconds_t ualarm(useconds_t, useconds_t);
unsigned sleep(unsigned);
-int usleep(useconds_t);
int pause(void);
-int nice(int);
pid_t fork(void);
-pid_t vfork(void);
int execve(const char *, char *const [], char *const []);
int execv(const char *, char *const []);
-int execle(const char *, ...);
-int execl(const char *, ...);
+int execle(const char *, const char *, ...);
+int execl(const char *, const char *, ...);
int execvp(const char *, char *const []);
-int execlp(const char *, ...);
-void _exit(int);
+int execlp(const char *, const char *, ...);
+int fexecve(int, char *const [], char *const []);
+_Noreturn void _exit(int);
pid_t getpid(void);
pid_t getppid(void);
pid_t getpgrp(void);
pid_t getpgid(pid_t);
int setpgid(pid_t, pid_t);
-int setpgrp(void);
pid_t setsid(void);
pid_t getsid(pid_t);
char *ttyname(int);
char *getlogin(void);
int getlogin_r(char *, size_t);
-long gethostid(void);
int gethostname(char *, size_t);
-int sethostname(const char *, size_t);
-int getpagesize(void);
char *ctermid(char *);
-int vhangup(void); /* dropped */
-
int getopt(int, char * const [], const char *);
extern char *optarg;
extern int optind, opterr, optopt;
-char *crypt(const char *, const char *);
-void encrypt(char *, int);
-
-void swab(const void *, void *, ssize_t);
-
long pathconf(const char *, int);
long fpathconf(int, int);
long sysconf(int);
size_t confstr(int, char *, size_t);
+#define F_ULOCK 0
+#define F_LOCK 1
+#define F_TLOCK 2
+#define F_TEST 3
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+int lockf(int, int, off_t);
+long gethostid(void);
+int nice(int);
+void sync(void);
+#endif
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+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 < 700)
+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 *);
+#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 pipe2(int [2], int);
+int dup3(int, int, int);
+void syncfs(int);
+#endif
+
+#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
+#define lseek64 lseek
+#define pread64 pread
+#define pwrite64 pwrite
+#define truncate64 truncate
+#define ftruncate64 ftruncate
+#define lockf64 lockf
+#define off64_t off_t
+#endif
+
#define _XOPEN_VERSION 700
#define _XOPEN_UNIX 1
#define _XOPEN_ENH_I18N 1