console_codes.4, inode.7: srcfix

[thirdparty/man-pages.git] / man2 / getresuid.2

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-.\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
-.\" and Copyright (c) 2007, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified, 2003-05-26, Michael Kerrisk, <mtk.manpages@gmail.com>
-.\"
-.TH GETRESUID 2 2021-03-22 "Linux man-pages (unreleased)"
-.SH NAME
-getresuid, getresgid \- get real, effective, and saved user/group IDs
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
-.B #include <unistd.h>
-.PP
-.BI "int getresuid(uid_t *" ruid ", uid_t *" euid ", uid_t *" suid );
-.BI "int getresgid(gid_t *" rgid ", gid_t *" egid ", gid_t *" sgid );
-.fi
-.SH DESCRIPTION
-.BR getresuid ()
-returns the real UID, the effective UID, and the saved set-user-ID
-of the calling process, in the arguments
-.IR ruid ,
-.IR euid ,
-and
-.IR suid ,
-respectively.
-.BR getresgid ()
-performs the analogous task for the process's group IDs.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-One of the arguments specified an address outside the calling program's
-address space.
-.SH VERSIONS
-These system calls appeared on Linux starting with kernel 2.1.44.
-.PP
-The prototypes are given by glibc since version 2.3.2,
-provided
-.B _GNU_SOURCE
-is defined.
-.SH STANDARDS
-These calls are nonstandard;
-they also appear on HP-UX and some of the BSDs.
-.SH NOTES
-The original Linux
-.BR getresuid ()
-and
-.BR getresgid ()
-system calls supported only 16-bit user and group IDs.
-Subsequently, Linux 2.4 added
-.BR getresuid32 ()
-and
-.BR getresgid32 (),
-supporting 32-bit IDs.
-The glibc
-.BR getresuid ()
-and
-.BR getresgid ()
-wrapper functions transparently deal with the variations across kernel versions.
-.SH SEE ALSO
-.BR getuid (2),
-.BR setresuid (2),
-.BR setreuid (2),
-.BR setuid (2),
-.BR credentials (7)