table of contents
SETRESUID(2) | Linux Programmer's Manual | SETRESUID(2) |
NAME¶
setresuid, setresgid - set real, effective and saved user or group ID
SYNOPSIS¶
#define _GNU_SOURCE
#include <unistd.h>
int setresuid(uid_t ruid, uid_t
euid, uid_t suid);
int setresgid(gid_t rgid, gid_t egid, gid_t
sgid);
DESCRIPTION¶
setresuid() sets the real user ID, the effective user ID, and the saved set-user-ID of the calling process.
Unprivileged user processes may change the real UID, effective UID, and saved set-user-ID, each to one of: the current real UID, the current effective UID or the current saved set-user-ID.
Privileged processes (on Linux, those having the CAP_SETUID capability) may set the real UID, effective UID, and saved set-user-ID to arbitrary values.
If one of the arguments equals -1, the corresponding value is not changed.
Regardless of what changes are made to the real UID, effective UID, and saved set-user-ID, the file system UID is always set to the same value as the (possibly new) effective UID.
Completely analogously, setresgid() sets the real GID, effective GID, and saved set-group-ID of the calling process (and always modifies the file system GID to be the same as the effective GID), with the same restrictions for non-privileged processes.
RETURN VALUE¶
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS¶
VERSIONS¶
These calls are available under Linux since Linux 2.1.44.
CONFORMING TO¶
These calls are non-standard; they also appear on HP-UX and some of the BSDs.
NOTES¶
Under HP-UX and FreeBSD the prototype is found in <unistd.h>. Under Linux the prototype is provided by glibc since version 2.3.2.
SEE ALSO¶
getresuid(2), getuid(2), setfsgid(2), setfsuid(2), setreuid(2), setuid(2), capabilities(7), credentials(7), feature_test_macros(7)
COLOPHON¶
This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
2007-07-26 | Linux |