Manpage of GETRESUID
GETRESUIDSection: Linux Programmer's Manual (2)
NAMEgetresuid, getresgid - get real, effective and saved user/group IDs
SYNOPSIS#define _GNU_SOURCE /* See feature_test_macros(7) */
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 errnois set appropriately.
- One of the arguments specified an address outside the calling program's address space.
VERSIONSThese system calls appeared on Linux starting with kernel 2.1.44.
CONFORMING TOThese 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)
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