|| Linux Programmer's Manual
NAME setresuid, setresgid - set real, effective and saved user or group ID
/* See feature_test_macros(7) */
() 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
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.
() 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 unprivileged processes.
RETURN VALUE On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
uid does not match the current UID and this call would bring that user ID over its
RLIMIT_NPROC resource limit.
The calling process is not privileged (did not have the
CAP_SETUID capability) and tried to change the IDs to values that are not permitted.
VERSIONS These calls are available under Linux since Linux 2.1.44.
CONFORMING TO These calls are nonstandard; they also appear on HP-UX and some of the BSDs.
Under HP-UX and FreeBSD, the prototype is found in
. Under Linux the prototype is provided by glibc since version 2.3.2.
The original Linux
() system calls supported only 16-bit user and group IDs. Subsequently, Linux 2.4 added
(), supporting 32-bit IDs. The glibc
() wrapper functions transparently deal with the variations across kernel versions.
COLOPHON This page is part of release 3.53 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/.