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sysdeps/unix/sysv/linux/setrlimit.c

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+/* Copyright (C) 1999 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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <sys/param.h>
+#include <sys/resource.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+#include "kernel-features.h"
+
+
+/* Linux 2.3.25 introduced a new system call since the types used for
+   the limits are now unsigned.  */
+#if !defined __ASSUME_NEW_GETRLIMIT_SYSCALL && defined __NR_ugetrlimit
+static int no_new_getrlimit;
+#else
+# define no_new_getrlimit	0
+#endif
+
+int
+__setrlimit (resource, rlimits)
+     enum __rlimit_resource resource;
+     const struct rlimit *rlimits;
+{
+#ifdef __NR_ugetrlimit
+  if (! no_new_getrlimit)
+    {
+      int result = INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
+
+# ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
+      /* If the system call is available return.  */
+      if (result != -1 || errno != ENOSYS)
+# endif
+	return result;
+
+# ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
+      /* Remember that the system call is not available.  */
+      no_new_getrlimit = 1;
+# endif
+    }
+#endif
+
+#ifndef __ASSUME_NEW_GETRLIMIT_SYSCALL
+  /* We might have to correct the limits values.  Since the old values
+     were signed the new values are too large.  */
+  rlimits->rlim_cur = MIN ((unsigned long int) rlimits->rlim_cur,
+			   RLIM_INFINITY >> 2);
+  rlimits->rlim_max = MIN ((unsigned long int) rlimits->rlim_max,
+			   RLIM_INFINITY >> 2);
+
+  /* Fall back on the old system call.  */
+  return INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
+#endif
+}
+weak_alias (__setrlimit, setrlimit)