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45 lines
1.9 KiB
ArmAsm
45 lines
1.9 KiB
ArmAsm
/* Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include <limits.h>
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/* Dynix erroneously reports `getgroups (0, 0)' as an error.
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We fix up for that case. */
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#define syscall_error myerror
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SYSCALL__ (getgroups, 2)
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#undef syscall_error
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ret
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myerror:
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tstl 4(%esp) /* Was the first arg 0? */
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jnz syscall_error /* If not, go to the normal error case. */
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/* When called with (0, 0), we want to return the number of groups
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without storing anything. The Dynix system call gives an error
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for this case, so we fix up by calling it with a local array we
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never use, and just use the return value. */
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subl %esp, $(NGROUPS_MAX * 4) /* Allocate a local array. */
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movl $NGROUPS_MAX, %ecx /* Pass NGROUPS_MAX for first arg. */
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movl %esp, %edx /* Pass local array for second arg. */
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DO_CALL (getgroups, 2) /* Do the system call. */
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addl %esp, $(NGROUPS_MAX * 4) /* Pop the local array. */
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jb syscall_error /* Check for error from the system call. */
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ret /* Return its value. */
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weak_alias (__getgroups, getgroups)
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