getresuid
Section: System Calls (2)
Updated: 2022-12-04
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NAME
getresuid, getresgid - get real, effective, and saved user/group IDs
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <unistd.h>
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
DESCRIPTION
getresuid()
returns the real UID, the effective UID, and the saved set-user-ID
of the calling process, in the arguments
ruid,
euid,
and
suid,
respectively.
getresgid()
performs the analogous task for the process's group IDs.
RETURN VALUE
On success, zero is returned.
On error, -1 is returned, and
errno
is set to indicate the error.
ERRORS
- EFAULT
-
One of the arguments specified an address outside the calling program's
address space.
VERSIONS
These system calls were added on Linux 2.1.44.
The prototypes are given since glibc 2.3.2,
provided
_GNU_SOURCE
is defined.
STANDARDS
These calls are nonstandard;
they also appear on HP-UX and some of the BSDs.
NOTES
The original Linux
getresuid()
and
getresgid()
system calls supported only 16-bit user and group IDs.
Subsequently, Linux 2.4 added
getresuid32()
and
getresgid32(),
supporting 32-bit IDs.
The glibc
getresuid()
and
getresgid()
wrapper functions transparently deal with the variations across kernel versions.
SEE ALSO
getuid(2),
setresuid(2),
setreuid(2),
setuid(2),
credentials(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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