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-.\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
-.\" and Copyright (C) 2005, 2010, 2014, 2015, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified, 2003-05-26, Michael Kerrisk, <mtk.manpages@gmail.com>
-.TH setresuid 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-setresuid, setresgid \- set real, effective, and saved user or group ID
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
-.B #include <unistd.h>
-.P
-.BI "int setresuid(uid_t " ruid ", uid_t " euid ", uid_t " suid );
-.BI "int setresgid(gid_t " rgid ", gid_t " egid ", gid_t " sgid );
-.fi
-.SH DESCRIPTION
-.BR setresuid ()
-sets the real user ID, the effective user ID, and the
-saved set-user-ID of the calling process.
-.P
-An unprivileged process may change its 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.
-.P
-A privileged process (on Linux, one having the \fBCAP_SETUID\fP capability)
-may set its real UID, effective UID, and
-saved set-user-ID to arbitrary values.
-.P
-If one of the arguments equals \-1, the corresponding value is not changed.
-.P
-Regardless of what changes are made to the real UID, effective UID,
-and saved set-user-ID, the filesystem UID is always set to the same
-value as the (possibly new) effective UID.
-.P
-Completely analogously,
-.BR setresgid ()
-sets the real GID, effective GID, and saved set-group-ID
-of the calling process (and always modifies the filesystem GID
-to be the same as the effective GID),
-with the same restrictions for unprivileged processes.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.P
-.IR Note :
-there are cases where
-.BR setresuid ()
-can fail even when the caller is UID 0;
-it is a grave security error to omit checking for a failure return from
-.BR setresuid ().
-.SH ERRORS
-.TP
-.B EAGAIN
-The call would change the caller's real UID (i.e.,
-.I ruid
-does not match the caller's real UID),
-but there was a temporary failure allocating the
-necessary kernel data structures.
-.TP
-.B EAGAIN
-.I ruid
-does not match the caller's real UID and this call would
-bring the number of processes belonging to the real user ID
-.I ruid
-over the caller's
-.B RLIMIT_NPROC
-resource limit.
-Since Linux 3.1, this error case no longer occurs
-(but robust applications should check for this error);
-see the description of
-.B EAGAIN
-in
-.BR execve (2).
-.TP
-.B EINVAL
-One or more of the target user or group IDs
-is not valid in this user namespace.
-.TP
-.B EPERM
-The calling process is not privileged (did not have the necessary
-capability in its user namespace)
-and tried to change the IDs to values that are not permitted.
-For
-.BR setresuid (),
-the necessary capability is
-.BR CAP_SETUID ;
-for
-.BR setresgid (),
-it is
-.BR CAP_SETGID .
-.SH VERSIONS
-.SS C library/kernel differences
-At the kernel level, user IDs and group IDs are a per-thread attribute.
-However, POSIX requires that all threads in a process
-share the same credentials.
-The NPTL threading implementation handles the POSIX requirements by
-providing wrapper functions for
-the various system calls that change process UIDs and GIDs.
-These wrapper functions (including those for
-.BR setresuid ()
-and
-.BR setresgid ())
-employ a signal-based technique to ensure
-that when one thread changes credentials,
-all of the other threads in the process also change their credentials.
-For details, see
-.BR nptl (7).
-.SH STANDARDS
-None.
-.SH HISTORY
-Linux 2.1.44,
-glibc 2.3.2.
-HP-UX, FreeBSD.
-.P
-The original Linux
-.BR setresuid ()
-and
-.BR setresgid ()
-system calls supported only 16-bit user and group IDs.
-Subsequently, Linux 2.4 added
-.BR setresuid32 ()
-and
-.BR setresgid32 (),
-supporting 32-bit IDs.
-The glibc
-.BR setresuid ()
-and
-.BR setresgid ()
-wrapper functions transparently deal with the variations across kernel versions.
-.SH SEE ALSO
-.BR getresuid (2),
-.BR getuid (2),
-.BR setfsgid (2),
-.BR setfsuid (2),
-.BR setreuid (2),
-.BR setuid (2),
-.BR capabilities (7),
-.BR credentials (7),
-.BR user_namespaces (7)