initgroups

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

initgroups - initialize the supplementary group access list  

LIBRARY

Standard C library (libc,~-lc)  

SYNOPSIS

#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

 

DESCRIPTION

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 no-NULL.  

RETURN VALUE

The initgroups() function returns 0 on success. On error, -1 is returned, and errno is set to indicate the error.  

ERRORS

ENOMEM

Insufficient memory to allocate group information structure.

EPERM

The calling process has insufficient privilege. See the underlying system call setgroups(2).

 

FILES

/etc/group

group database file

 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
initgroups()	Thread safety	M-Safe locale

 

STANDARDS

None.  

HISTORY

SVr4, 4.3BSD.  

SEE ALSO

getgroups(2), setgroups(2), credentials(7)

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Index

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

FILES

ATTRIBUTES

STANDARDS

HISTORY

SEE ALSO