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);
DESCRIPTION
seteuid sets the effective user ID of the current process. Unprivileged user processes may only set the effective user ID to the real user
ID, the effective user ID or the saved 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 current process is not the super-user and euid (resp. egid) is not the real user (group) ID, the effective user (group) ID or
the saved user (group) ID.
NOTES
Setting the effective user (group) ID to the saved user (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 glibc2.0 seteuid(euid) is equivalent to setreuid(-1, euid) and hence may change the saved user ID. Under glibc2.1
it is equivalent to setresuid(-1, euid,-1) and hence does not change the saved user ID. Similar remarks hold for setegid.
CONFORMING TO
BSD 4.3
SEE ALSO geteuid(2), setuid(2), setreuid(2), setresuid(2)Linux 2.4 2001-05-17 SETEUID(2)
Check Out this Related Man Page
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 appropriately.
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 arbi-
trary 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 sete-
gid().
According to POSIX.1, seteuid() (setegid()) need not permit euid (egid) to be the same value as the current effective user (group) ID, and
some implementations do not permit this.
SEE ALSO geteuid(2), setresuid(2), setreuid(2), setuid(2), capabilities(7), credentials(7)COLOPHON
This page is part of release 3.27 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/.
Linux 2009-10-17 SETEUID(2)
hi, can anyone tell me where can i find euid and egid from /proc file system in RHEL 4? i read stat file, but i got only uid and gid, and cudnot find any entry regarding euid and egid.please suggest...
thanks,
sanjay (2 Replies)
I am writing programm that changes permission in the running;
I used at the command : seteuid();
the id of the process is changed but the permission not, why??
The program:
int status;
pid_t child = fork();
if (child == 0)
{
seteuid(1200); // I checks that "1200" is exist id process
... (1 Reply)
Hi all,
Ok, bear with me on this one, I am a bit new to Unix and it might take me a little bit of time to articulate my question.
I know that every process has a user id and an effective user id. This seems to include the shell itself, because when I type 'ps', I see 'bash' listed as a... (2 Replies)