mirror of https://github.com/mkerrisk/man-pages
84 lines
2.4 KiB
Groff
84 lines
2.4 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
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.\" Modified 2004-10-10 by aeb
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.\"
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.TH INITGROUPS 3 2004-10-10 "GNU" "Linux Programmer's Manual"
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.SH NAME
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initgroups \- initialize the supplementary group access list
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.SH SYNOPSIS
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.nf
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.B #include <sys/types.h>
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.B #include <grp.h>
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.sp
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.BI "int initgroups(const char *" user ", gid_t " group );
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.fi
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.SH DESCRIPTION
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The
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.BR initgroups ()
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function initializes the group access list by
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reading the group database \fI/etc/group\fP and using all groups of
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which \fIuser\fP is a member.
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The additional group \fIgroup\fP is
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also added to the list.
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The
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.I user
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argument must be non-NULL.
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.SH "RETURN VALUE"
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The
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.BR initgroups ()
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function returns 0 on success.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B ENOMEM
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Insufficient memory to allocate group information structure.
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.TP
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.B EPERM
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The calling process has insufficient privilege.
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See the underlying system call
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.BR setgroups (2).
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.SH FILES
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.nf
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\fI/etc/group\fP group database file
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.fi
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.SH "CONFORMING TO"
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SVr4, 4.3BSD
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.SH NOTES
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The prototype for
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.BR initgroups ()
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is only available if
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.B _BSD_SOURCE
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is defined.
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.SH "SEE ALSO"
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.BR getgroups (2),
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.BR setgroups (2),
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.BR credentials (7)
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