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setgroups(2) [netbsd man page]

SETGROUPS(2)						      BSD System Calls Manual						      SETGROUPS(2)

setgroups -- set group access list LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/param.h> #include <unistd.h> int setgroups(int ngroups, const gid_t *gidset); DESCRIPTION
setgroups() sets the group access list of the current user process according to the array gidset. The parameter ngroups indicates the number of entries in the array and must be no more than {NGROUPS_MAX}. Only the super-user may set new groups. This system call affects only secondary groups. RETURN VALUES
A 0 value is returned on success, -1 on error, with an error code stored in errno. ERRORS
The setgroups() call will fail if: [EINVAL] The value of ngroups is greater than {NGROUPS_MAX}. [EPERM] The caller is not the super-user. [EFAULT] The address specified for gidset is outside the process address space. SEE ALSO
getgroups(2), setegid(2), setgid(2), setregid(2), initgroups(3) HISTORY
The setgroups() function call appeared in 4.2BSD. BSD
October 7, 2006 BSD

Check Out this Related Man Page

GETGROUPS(2)						      BSD System Calls Manual						      GETGROUPS(2)

getgroups -- get group access list LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int getgroups(int gidsetlen, gid_t *gidset); DESCRIPTION
The getgroups() system call gets the current group access list of the user process and stores it in the array gidset. The gidsetlen argument indicates the number of entries that may be placed in gidset. The getgroups() system call returns the actual number of groups returned in gidset. At least one and as many as {NGROUPS_MAX}+1 values may be returned. If gidsetlen is zero, getgroups() returns the number of supple- mentary group IDs associated with the calling process without modifying the array pointed to by gidset. The value of {NGROUPS_MAX} should be obtained using sysconf(3) to avoid hard-coding it into the executable. 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), sysconf(3) STANDARDS
The getgroups() system call conforms to IEEE Std 1003.1-2008 (``POSIX.1''). HISTORY
The getgroups() system call appeared in 4.2BSD. BSD
January 21, 2011 BSD
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