From: Ulrich Drepper <drepper@redhat.com>
Date: Thu, 2 Dec 1999 08:25:02 +0000 (+0000)
Subject: Correct handling of old and new kernel version.  Add symbol versions.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d095d9e7f95d7524f33b76adcf78271e2fb34ffc;p=thirdparty%2Fglibc.git

Correct handling of old and new kernel version.  Add symbol versions.
---

diff --git a/sysdeps/unix/sysv/linux/setrlimit.c b/sysdeps/unix/sysv/linux/setrlimit.c
index f0c3e41e07d..b2f25ca5cb2 100644
--- a/sysdeps/unix/sysv/linux/setrlimit.c
+++ b/sysdeps/unix/sysv/linux/setrlimit.c
@@ -25,44 +25,63 @@
 
 extern int __syscall_setrlimit (unsigned int resource,
 				const struct rlimit *rlimits);
+extern int __syscall_ugetrlimit (unsigned int resource,
+				 const struct rlimit *rlimits);
 
 /* Linux 2.3.25 introduced a new system call since the types used for
    the limits are now unsigned.  */
 #ifdef __NR_ugetrlimit
-static int no_new_getrlimit;
-#else
-# define no_new_getrlimit	0
+extern int __have_no_new_getrlimit;	/* In getrlimit.c.  */
 #endif
 
 int
-__setrlimit (resource, rlimits)
-     enum __rlimit_resource resource;
-     const struct rlimit *rlimits;
+__new_setrlimit (enum __rlimit_resource resource, const struct rlimit *rlimits)
 {
   struct rlimit rlimits_small;
 
 #ifdef __NR_ugetrlimit
-  if (! no_new_getrlimit)
+  if (__have_no_new_getrlimit <= 0)
     {
       int result = INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
 
-      /* If the system call is available return.  */
-      if (result != -1 || errno != ENOSYS)
+      /* Return if the values are not out of range or if we positively
+         know that the ugetrlimit system call exists.  */
+      if (result != -1 || errno != EINVAL || __have_no_new_getrlimit < 0)
 	return result;
 
-      /* Remember that the system call is not available.  */
-      no_new_getrlimit = 1;
+      /* Check if the new ugetrlimit syscall exists.  */
+      if (INLINE_SYSCALL (ugetrlimit, 2, resource, &rlimits_small) != -1
+	  || errno != ENOSYS)
+	{
+	  /* There was some other error, probably RESOURCE out of range.
+             Remember that the ugetrlimit system call really exists.  */
+	  __have_no_new_getrlimit = -1;
+	  /* Restore previous errno value.  */
+	  __set_errno (EINVAL);
+	  return result;
+	}
+
+      /* Remember that the kernel uses the old interface.  */
+      __have_no_new_getrlimit = 1;
     }
 #endif
 
   /* We might have to correct the limits values.  Since the old values
-     were signed the new values are too large.  */
+     were signed the new values might be too large.  */
   rlimits_small.rlim_cur = MIN ((unsigned long int) rlimits->rlim_cur,
-				RLIM_INFINITY >> 2);
+				RLIM_INFINITY >> 1);
   rlimits_small.rlim_max = MIN ((unsigned long int) rlimits->rlim_max,
-				RLIM_INFINITY >> 2);
+				RLIM_INFINITY >> 1);
 
-  /* Fall back on the old system call.  */
-  return INLINE_SYSCALL (setrlimit, 2, resource, rlimits);
+  /* Try again with the adjusted values.  */
+  return INLINE_SYSCALL (setrlimit, 2, resource, &rlimits_small);
 }
-weak_alias (__setrlimit, setrlimit)
+
+#if defined PIC && DO_VERSIONING
+default_symbol_version (__new_setrlimit, __setrlimit, GLIBC_2.1.3);
+strong_alias (__new_setrlimit, _new_setrlimit);
+default_symbol_version (_new_setrlimit, setrlimit, GLIBC_2.1.3);
+#else
+weak_alias (__new_setrlimit, __setrlimit);
+weak_alias (__new_setrlimit, setrlimit);
+#endif