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 *, char *, size_t);
+ssize_t readlinkat(int, const char *, char *, size_t);
int unlink(const char *);
int unlinkat(int, const char *, int);
int rmdir(const char *);
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
int lockf(int, int, off_t);
-int setpgrp(void);
+pid_t setpgrp(void);
char *crypt(const char *, const char *);
void encrypt(char *, int);
void swab(const void *, void *, ssize_t);
long gethostid(void);
int nice(int);
void sync(void);
-int getdtablesize(void);
#endif
#ifdef _GNU_SOURCE
int setgroups(size_t, const gid_t []);
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 daemon(int, int);
+int getdomainname(char *, size_t);
+int getdtablesize(void);
+void setusershell(void);
+void endusershell(void);
+char *getusershell(void);
#endif
#define _XOPEN_VERSION 700