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getresuid(2) — Linux manual page

getresuid(2)               System Calls Manualgetresuid(2)

NAME        top

       getresuid, getresgid - get real, effective, and saved user/group       IDs

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#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        top

getresuid() returns the real UID, the effective UID, and the saved       set-user-ID of the calling process, in the argumentsruid,euid,       andsuid, respectively.getresgid() performs the analogous task       for the process's group IDs.

RETURN VALUE        top

       On success, zero is returned.  On error, -1 is returned, anderrno       is set to indicate the error.

ERRORS        top

EFAULTOne of the arguments specified an address outside the              calling program's address space.

STANDARDS        top

       None.  These calls also appear on HP-UX and some of the BSDs.

HISTORY        top

       Linux 2.1.44, glibc 2.3.2.       The original Linuxgetresuid() andgetresgid() system calls       supported only 16-bit user and group IDs.  Subsequently, Linux 2.4       addedgetresuid32() andgetresgid32(), supporting 32-bit IDs.  The       glibcgetresuid() andgetresgid() wrapper functions transparently       deal with the variations across kernel versions.

SEE ALSO        top

getuid(2),setresuid(2),setreuid(2),setuid(2),credentials(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17getresuid(2)

Pages that refer to this page:getgid(2), getuid(2), setresuid(2), syscalls(2), id_t(3type), credentials(7)

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