SETRESUID man page on FreeBSD

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SETRESUID(2)		    BSD 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, effec‐
     tive 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
     unchanged.

     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
			current real ID, the current effective ID nor the cur‐
			rent saved ID.

     [EFAULT]		An address passed to getresgid() or getresuid() was
			invalid.

SEE ALSO
     getegid(2), geteuid(2), getgid(2), getuid(2), issetugid(2), setgid(2),
     setregid(2), setreuid(2), setuid(2)

STANDARDS
     These system calls are not available on many platforms.  They exist in
     FreeBSD to support Linux binaries linked against GNU libc2.

HISTORY
     These functions first appeared in HP-UX.

BSD				April 13, 2001				   BSD
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