getresuid - Online Linux Manual PageSection : 2
Updated : 2022-12-04
Source : Linux man-pages 6.03
NAMEgetresuid, getresgid − get real, effective, and saved user/group IDs
LIBRARYStandard 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);
DESCRIPTIONgetresuid() 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 VALUEOn success, zero is returned. On error, −1 is returned, and errno is set to indicate the error.
ERRORSEFAULT One of the arguments specified an address outside the calling program's address space.
VERSIONSThese system calls were added on Linux 2.1.44. The prototypes are given since glibc 2.3.2, provided _GNU_SOURCE is defined.
STANDARDSThese calls are nonstandard; they also appear on HP-UX and some of the BSDs.
NOTESThe 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 ALSOgetuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7) 0
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