View Source: seteuid(2) - Waikato Linux Users Group

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SETEUID
!!!SETEUID
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
NOTES
CONFORMING TO
SEE ALSO
----
!!NAME


seteuid, setegid - set effective user or group ID
!!SYNOPSIS


__#include __
#include __


__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
__
!!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)
----

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Last edited on Tuesday, June 4, 2002 12:23:46 am by "perry"

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