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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | FILES | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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initgroups(3) Library Functions Manual initgroups(3)
initgroups - initialize the supplementary group access list
Standard C library (libc, -lc)
#include <sys/types.h>
#include <grp.h>
int initgroups(const char *user, gid_t group);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
initgroups():
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_BSD_SOURCE
The initgroups() function initializes the group access list by
reading the group database /etc/group and using all groups of
which user is a member. The additional group group is also added
to the list.
The user argument must be non-NULL.
The initgroups() function returns 0 on success. On error, -1 is
returned, and errno is set to indicate the error.
ENOMEM Insufficient memory to allocate group information
structure.
EPERM The calling process has insufficient privilege. See the
underlying system call setgroups(2).
/etc/group
group database file
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────┼───────────────┼────────────────┤
│ initgroups() │ Thread safety │ MT-Safe locale │
└──────────────────────────────┴───────────────┴────────────────┘
None.
SVr4, 4.3BSD.
getgroups(2), setgroups(2), credentials(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-05-02 initgroups(3)
Pages that refer to this page: groups(1@@shadow-utils), getgroups(2), group(5), nss(5), credentials(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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