console_codes.4, inode.7: srcfix

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

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-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH GETGID 2 2021-03-22 "Linux" "Linux Programmer's Manual"
-.SH NAME
-getgid, getegid \- get group identity
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.PP
-.B gid_t getgid(void);
-.B gid_t getegid(void);
-.fi
-.SH DESCRIPTION
-.BR getgid ()
-returns the real group ID of the calling process.
-.PP
-.BR getegid ()
-returns the effective group ID of the calling process.
-.SH ERRORS
-These functions are always successful
-and never modify
-.\" https://www.austingroupbugs.net/view.php?id=511
-.\" 0000511: getuid and friends should not modify errno
-.IR errno .
-.SH CONFORMING TO
-POSIX.1-2001, POSIX.1-2008, 4.3BSD.
-.SH NOTES
-The original Linux
-.BR getgid ()
-and
-.BR getegid ()
-system calls supported only 16-bit group IDs.
-Subsequently, Linux 2.4 added
-.BR getgid32 ()
-and
-.BR getegid32 (),
-supporting 32-bit IDs.
-The glibc
-.BR getgid ()
-and
-.BR getegid ()
-wrapper functions transparently deal with the variations across kernel versions.
-.PP
-On Alpha, instead of a pair of
-.BR getgid ()
-and
-.BR getegid ()
-system calls, a single
-.BR getxgid ()
-system call is provided, which returns a pair of real and effective GIDs.
-The glibc
-.BR getgid ()
-and
-.BR getegid ()
-wrapper functions transparently deal with this.
-See
-.BR syscall (2)
-for details regarding register mapping.
-.SH SEE ALSO
-.BR getresgid (2),
-.BR setgid (2),
-.BR setregid (2),
-.BR credentials (7)