From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Wed, 10 Apr 2013 15:27:30 +0000 (+0200)
Subject: Disable stream buffer when reading /proc/self/maps.
X-Git-Tag: v3_9_90~412^2~13
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/a9b7c2dbec80a51f8615e24b6cb8f565f1273dd0?ds=sidebyside

Disable stream buffer when reading /proc/self/maps.

I don't fully  understand why it is necessary but, without this change, the MC
tests may terminate on a SIGSEGV.  It is likely because some memory regions are
unmapped on fclose, and then the real memory map is different from the
informations that were read.
---

diff --git a/src/mc/memory_map.c b/src/mc/memory_map.c
index b4315233c4..b0e84a63cf 100644
--- a/src/mc/memory_map.c
+++ b/src/mc/memory_map.c
@@ -32,6 +32,8 @@ memory_map_t get_memory_map(void)
   xbt_assert(fp,
               "Cannot open /proc/self/maps to investigate the memory map of the process. Please report this bug.");
 
+  setbuf(fp, NULL);
+
   ret = xbt_new0(s_memory_map_t, 1);
 
   /* Read one line at the time, parse it and add it to the memory map to be returned */