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getresuid(2) System Calls Manual getresuid(2)
getresuid, getresgid - get real, effective, and saved user/group IDs
Standard C library (libc, -lc)
#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);
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.
On success, zero is returned. On error, -1 is returned, and errno is set to indicate the error.
EFAULT One of the arguments specified an address outside the calling program's address space.
None. These calls also appear on HP-UX and some of the BSDs.
Linux 2.1.44, glibc 2.3.2. 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.
getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)
Linux man-pages 6.04 2023-03-30 getresuid(2)
Pages that refer to this page: getgid(2), getuid(2), setresuid(2), syscalls(2), id_t(3type), credentials(7)