initgroups

Section: C Library Functions (3)
Updated: 2023-02-05
Index Return to Main Contents
 

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 non-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).
InterfaceAttributeValue
initgroups() Thread safetyMT-Safe locale

 

STANDARDS

SVr4, 4.3BSD.  

SEE ALSO

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

 

Index

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
FILES
ATTRIBUTES
STANDARDS
SEE ALSO
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Time: 02:34:39 GMT, April 20, 2024