getgroups(2) [opendarwin man page]
GETGROUPS(2) BSD System Calls Manual GETGROUPS(2) NAME
getgroups -- get group access list SYNOPSIS
#include <sys/param.h> #include <sys/types.h> #include <unistd.h> int getgroups(int gidsetlen, gid_t *gidset); DESCRIPTION
Getgroups() gets the current group access list of the current user process and stores it in the array gidset. The parameter gidsetlen indi- cates the number of entries that may be placed in gidset. Getgroups() returns the actual number of groups returned in gidset. No more than {NGROUPS_MAX} will ever be returned. If gidsetlen is 0, getgroups() returns the number of groups without modifying the gidset array. RETURN VALUES
A successful call returns the number of groups in the group set. A value of -1 indicates that an error occurred, and the error code is stored in the global variable errno. ERRORS
The possible errors for getgroups() are: [EINVAL] The argument gidsetlen is smaller than the number of groups in the group set. [EFAULT] The argument gidset specifies an invalid address. SEE ALSO
setgroups(2), initgroups(3) HISTORY
The getgroups() function call appeared in 4.2BSD. 4.2 Berkeley Distribution April 16, 1994 4.2 Berkeley Distribution
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GETGROUPS(2) BSD System Calls Manual GETGROUPS(2) NAME
getgroups -- get group access list LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int getgroups(int gidsetlen, gid_t *gidset); DESCRIPTION
getgroups() gets the current group access list of the current user process and stores it in the array gidset. The parameter gidsetlen indi- cates the number of entries that may be placed in gidset. getgroups() returns the actual number of groups returned in gidset. No more than {NGROUPS_MAX} will ever be returned. If gidsetlen is 0, getgroups() returns the number of groups without modifying the gidset array. This system call only returns the secondary groups. RETURN VALUES
A successful call returns the number of groups in the group set. A value of -1 indicates that an error occurred, and the error code is stored in the global variable errno. ERRORS
The possible errors for getgroups() are: [EINVAL] The argument gidsetlen is non-zero and is smaller than the number of groups in the group set. [EFAULT] The argument gidset specifies an invalid address. SEE ALSO
getegid(2), getgid(2), setgroups(2), initgroups(3) STANDARDS
The getgroups() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The getgroups() function call appeared in 4.2BSD. BSD
October 7, 2006 BSD