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# getresuid() - Unix, Linux System Call

# NAME

getresuid, getresgid - get real, effective and saved user or group ID

# SYNOPSIS

#define _GNU_SOURCE
#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() and getresgid() (both introduced in Linux 2.1.44) get the real UID, effective UID, and saved set-user-ID (resp. group ID’s) of the current process.

# RETURN VALUE

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

# ERRORS

Tag | Description
--- | ---
EFAULT | One of the arguments specified an address outside the calling program’s address space.

# CONFORMING TO

These calls are non-standard; they also appear on HP-UX and some of the BSDs.

The prototype is given by glibc since version 2.3.2 provided _GNU_SOURCE is defined.

# SEE ALSO

- getuid (2)

- setresuid (2)

- setreuid (2)

- setuid (2)

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