Name
getresuid, getresgid - get real, effective, and saved user/group IDsLibrary
Standard C library ( libc ", " -lc )Synopsis
"#define(7)_GNU_SOURCE" " /* See feature_test_macros */" #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
getresuid() returns the real UID, the effective UID, and the saved set-user-ID of the calling process, in the argumentsruid
, euid
, and suid
, respectively. getresgid() performs the analogous task for the process's group IDs. Return Value
On success, zero is returned. On error, -1 is returned, and errno is set to indicate the error.Errors
EFAULT One of the arguments specified an address outside the calling program's address space.
Standards
None. These calls also appear on HP-UX and some of the BSDs.History
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.
See Also
- getuid(2),
- setresuid(2),
- setreuid(2),
- setuid(2),
- credentials(7)