getresuid - Online Linux Manual PageSection : 2
Updated : 2022-12-04
Source : Linux man-pages 6.03

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NAMEgetresuid, getresgid − get real, effective, and saved user/group IDs

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LIBRARYStandard C library (libc, −lc)

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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);

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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.

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RETURN VALUEOn success, zero is returned. On error, −1 is returned, and errno is set to indicate the error.

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

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VERSIONSThese system calls were added on Linux 2.1.44. The prototypes are given since glibc 2.3.2, provided _GNU_SOURCE is defined.

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STANDARDSThese calls are nonstandard; they also appear on HP-UX and some of the BSDs.

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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.

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SEE ALSOgetuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7) 0

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