man/man3c/initgroups.3c

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 initgroups 3C "22 Mar 2004" "SunOS 5.11" "Standard C Library Functions"
 NAME
initgroups - initialize the supplementary group access list
 SYNOPSIS

#include <grp.h>
#include <sys/types.h>

int initgroups(const char *name, gid_t basegid);


 DESCRIPTION

The initgroups() function reads the group database to get the group
membership for the user specified by name, and initializes the
supplementary group access list of the calling process (see getgrnam(3C)
and getgroups(2)). The basegid group ID is also included in the
supplementary group access list. This is typically the real group ID from the
user database.

While scanning the group database, if the number of groups, including the
basegid entry, exceeds NGROUPS_MAX, subsequent group entries are
ignored.
 RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned and
errno is set to indicate the error.
 ERRORS

The initgroups() function will fail and not change the supplementary
group access list if:

EPERM

The {PRIV_PROC_SETID} privilege is not asserted in the effective set of
the calling process.


 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe


 SEE ALSO

getgroups(2), getgrnam(3C), attributes(5)