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); |
![[Note]](../stylesheet/note.png) |
Note | ||
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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
appropriately.
ERRORS
- EPERM
-
The calling process is not privileged (Linux: does not have the
CAP_SETUIDcapability in the case ofseteuid(), or theCAP_SETGIDcapability in the case ofsetegid()) andeuid(resp.egid) is not the real user (group) ID, the effective user (group) ID, or the saved set-user-ID (saved set-group-ID).
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 equivalent
to setresuid(−1, euid, −1) and hence does not
change the saved set-user-ID. Similar remarks hold for
setegid().
COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright (C) 2001 Andries Brouwer (aebcwi.nl) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. [should really be seteuid.3] Modified, 27 May 2004, Michael Kerrisk <mtk.manpagesgmail.com> Added notes on capability requirements |