getresuid(2) System Calls Manual getresuid(2)
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 de-
fined.
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 getre-
suid32() and getresgid32(), supporting 32-bit IDs. The glibc getre-
suid() and getresgid() wrapper functions transparently deal with the
variations across kernel versions.
SEE ALSO
getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)
Linux man-pages 6.03 2022-12-04 getresuid(2)
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