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setreuid(2) [bsd man page]

SETREUID(2)							System Calls Manual						       SETREUID(2)

setreuid - set real and effective user ID's SYNOPSIS
setreuid(ruid, euid) int ruid, euid; DESCRIPTION
The real and effective user ID's 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. RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate 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), setregid(2), setuid(3) 4th Berkeley Distribution May 9, 1985 SETREUID(2)

Check Out this Related Man Page

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

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)

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