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BSD 2.11 - man page for setgroups (bsd section 2)

SETGROUPS(2)					 System Calls Manual					 SETGROUPS(2)

NAME
setgroups - set group access list
SYNOPSIS
#include <sys/param.h> setgroups(ngroups, gidset) int ngroups, *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, as defined in <sys/param.h>. Only the super-user may set new groups.
RETURN VALUE
A 0 value is returned on success, -1 on error, with a error code stored in errno.
ERRORS
The setgroups call will fail if: [EPERM] The caller is not the super-user. [EFAULT] The address specified for gidset is outside the process address space.
SEE ALSO
getgroups(2), initgroups(3X)
BUGS
The gidset array should be of type gid_t, but remains integer for compatibility with earlier systems. 4.2 Berkeley Distribution May 13, 1986 SETGROUPS(2)


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