From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 22 Aug 2022 09:04:47 +0000 (+0200)
Subject: alpha: Fix generic brk system call emulation in __brk_call (bug 29490)
X-Git-Tag: glibc-2.37~413
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e7ad26ee3cb74e61d0637c888f24dd478d77af58;p=thirdparty%2Fglibc.git

alpha: Fix generic brk system call emulation in __brk_call (bug 29490)

The kernel special-cases the zero argument for alpha brk, and we can
use that to restore the generic Linux error handling behavior.

Fixes commit b57ab258c1140bc45464b4b9908713e3e0ee35aa ("Linux:
Introduce __brk_call for invoking the brk system call").
---

diff --git a/sysdeps/unix/sysv/linux/alpha/brk_call.h b/sysdeps/unix/sysv/linux/alpha/brk_call.h
index b8088cf13f9..0b851b6c866 100644
--- a/sysdeps/unix/sysv/linux/alpha/brk_call.h
+++ b/sysdeps/unix/sysv/linux/alpha/brk_call.h
@@ -21,8 +21,7 @@ __brk_call (void *addr)
 {
   unsigned long int result = INTERNAL_SYSCALL_CALL (brk, addr);
   if (result == -ENOMEM)
-    /* Mimic the default error reporting behavior.  */
-    return addr;
-  else
-    return (void *) result;
+    /* Mimic the generic error reporting behavior.  */
+    result = INTERNAL_SYSCALL_CALL (brk, 0);
+  return (void *) result;
 }