setreuid(2) [osx man page]

SETREUID(2)						      BSD System Calls Manual						       SETREUID(2)

NAME

     setreuid -- set real and effective user IDs

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     setreuid(uid_t ruid, uid_t euid);

DESCRIPTION

     The real and effective user IDs of the current process are set according to the arguments.  If ruid or euid is -1, the current uid is filled
     in by the system.	Unprivileged users may change the real user ID to the effective user ID and vice-versa; only the super-user may make other
     changes.

     The setreuid() function has been used to swap the real and effective user IDs in set-user-ID programs to temporarily relinquish the set-user-
     ID value.	This purpose is now better served by the use of the seteuid() function (see setuid(2)).

     When setting the real and effective user IDs to the same value, the standard setuid() function is preferred.

RETURN VALUES

     The setreuid() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

ERRORS

     [EPERM]		The current process is not the super-user and a change other than changing the effective user-id to the real user-id was
			specified.

SEE ALSO

     getuid(2), issetugid(2), seteuid(2), setuid(2)

HISTORY

     The setreuid() system call appeared in 4.2BSD.

BSD
								 February 8, 2001							       BSD

SETREUID(2)						     Linux Programmer's Manual						       SETREUID(2)

NAME

       setreuid, setregid - set real and/or effective user or group ID

SYNOPSIS

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

       int setreuid(uid_t ruid, uid_t euid);
       int setregid(gid_t rgid, gid_t egid);

DESCRIPTION

       setreuid  sets real and effective user IDs of the current process.  Unprivileged users may only set the real user ID to the real user ID or
       the effective user ID, and may only set the effective user ID to the real user ID, the effective user ID or the saved user ID.

       Supplying a value of -1 for either the real or effective user ID forces the system to leave that ID unchanged.

       If the real user ID is set or the effective user ID is set to a value not equal to the previous real user ID, the saved user ID will be set
       to the new effective user ID.

       Completely analogously, setregid sets real and effective group ID's of the current process, and all of the above holds with "group" instead
       of "user".

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EPERM  The current process is not the super-user and changes other than (i) swapping the effective user	(group)  ID  with  the	real  user
	      (group)  ID,  or (ii) setting one to the value of the other or (iii) setting the effective user (group) ID to the value of the saved
	      user (group) ID was specified.

NOTES

       Setting the effective user (group) ID to the saved user ID is possible since Linux 1.1.37 (1.1.38).

CONFORMING TO

       BSD 4.3 (the setreuid and setregid function calls first appeared in 4.2BSD).

SEE ALSO

       getuid(2), getgid(2), setuid(2), setgid(2), seteuid(2), setresuid(2)

Linux 1.1.38							    1994-08-02							       SETREUID(2)