diff options
Diffstat (limited to 'sysdeps/unix/bsd/sequent/i386/getgroups.S')
| -rw-r--r-- | sysdeps/unix/bsd/sequent/i386/getgroups.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/sequent/i386/getgroups.S b/sysdeps/unix/bsd/sequent/i386/getgroups.S new file mode 100644 index 0000000000..b68bcbdbaa --- /dev/null +++ b/sysdeps/unix/bsd/sequent/i386/getgroups.S @@ -0,0 +1,44 @@ +/* Copyright (C) 1994, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <sysdep.h> +#include <limits.h> + +/* Dynix erroneously reports `getgroups (0, 0)' as an error. + We fix up for that case. */ + +#define syscall_error myerror +SYSCALL__ (getgroups, 2) +#undef syscall_error + ret +myerror: + tstl 4(%esp) /* Was the first arg 0? */ + jnz syscall_error /* If not, go to the normal error case. */ + /* When called with (0, 0), we want to return the number of groups + without storing anything. The Dynix system call gives an error + for this case, so we fix up by calling it with a local array we + never use, and just use the return value. */ + subl %esp, $(NGROUPS_MAX * 4) /* Allocate a local array. */ + movl $NGROUPS_MAX, %ecx /* Pass NGROUPS_MAX for first arg. */ + movl %esp, %edx /* Pass local array for second arg. */ + DO_CALL (getgroups, 2) /* Do the system call. */ + addl %esp, $(NGROUPS_MAX * 4) /* Pop the local array. */ + jb syscall_error /* Check for error from the system call. */ + ret /* Return its value. */ + +weak_alias (__getgroups, getgroups) |