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SETRESUID(2)		       System Calls Manual		    SETRESUID(2)

NAME
     getresgid,  getresuid,  setresgid,  setresuid -- get or set real, effective
     and saved user or group ID

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <unistd.h>

     int
     getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);

     int
     getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);

     int
     setresgid(gid_t rgid, gid_t egid, gid_t sgid);

     int
     setresuid(uid_t ruid, uid_t euid, uid_t suid);

DESCRIPTION
     The setresuid() system call sets the real, effective and saved user IDs  of
     the  current  process.   The analogous setresgid() sets the real, effective
     and saved group IDs.

     Privileged processes may set these IDs to arbitrary  values.   Unprivileged
     processes	are restricted in that each of the new IDs must match one of the
     current IDs.

     Passing -1 as an argument causes the  corresponding  value  to  remain  un-
     changed.

     The  getresgid()  and  getresuid()  calls retrieve the real, effective, and
     saved group and user IDs of the current process, respectively.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the value -1
     is returned and the global variable errno is set to indicate the error.

ERRORS
     [EPERM]		The calling process was  not  privileged  and  tried  to
			change one or more IDs to a value which was not the cur-
			rent  real  ID, the current effective ID nor the current
			saved ID.

     [EFAULT]		An address passed to getresgid() or getresuid() was  in-
			valid.

SEE ALSO
     getegid(2),  geteuid(2), getgid(2), getuid(2), issetugid(2), setgid(2), se-
     tregid(2), setreuid(2), setuid(2)

HISTORY
     These functions first appeared in HP-UX.

FreeBSD ports 15.quarterly	February 7, 2015		    SETRESUID(2)

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