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SETEUID(2) Linux Programmer's Manual SETEUID(2)
NAME
seteuid, setegid - set effective user or group ID
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int seteuid(uid_t euid);
int setegid(gid_t egid);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
seteuid(), setegid(): _BSD_SOURCE || _POSIX_C_SOURCE >= 200112L ||
_XOPEN_SOURCE >= 600
DESCRIPTION
seteuid() sets the effective user ID of the calling process. Unprivileged user
processes may only set the effective user ID to the real user ID, the effective
user ID or the saved set-user-ID.
Precisely the same holds for setegid() with "group" instead of "user".
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropri-
ately.
ERRORS
EPERM The calling process is not privileged (Linux: does not have the CAP_SETUID
capability in the case of seteuid(), or the CAP_SETGID capability in the
case of setegid()) and euid (respectively, egid) is not the real user
(group) ID, the effective user (group) ID, or the saved set-user-ID (saved
set-group-ID).
CONFORMING TO
4.3BSD, POSIX.1-2001.
NOTES
Setting the effective user (group) ID to the saved set-user-ID (saved set-group-ID)
is possible since Linux 1.1.37 (1.1.38). On an arbitrary system one should check
_POSIX_SAVED_IDS.
Under libc4, libc5 and glibc 2.0 seteuid(euid) is equivalent to setreuid(-1, euid)
and hence may change the saved set-user-ID. Under glibc 2.1 and later it is equiv-
alent to setresuid(-1, euid, -1) and hence does not change the saved set-user-ID.
Similar remarks hold for setegid().
SEE ALSO
geteuid(2), setresuid(2), setreuid(2), setuid(2), capabilities(7), credentials(7)
COLOPHON
This page is part of release 3.22 of the Linux man-pages project. A description of
the project, and information about reporting bugs, can be found at http://www.ker-
nel.org/doc/man-pages/.
Linux 2007-07-26 SETEUID(2)
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