X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f93abc6448737e66b30c1eb5f4d341dc518d6d00..725184f3bce66a3eff87cc3a01e5d96477a5d28a:/src/xbt/backtrace_linux.c

diff --git a/src/xbt/backtrace_linux.c b/src/xbt/backtrace_linux.c
index a74a12914b..89e229f753 100644
--- a/src/xbt/backtrace_linux.c
+++ b/src/xbt/backtrace_linux.c
@@ -9,24 +9,42 @@
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
+/* This file is to be included in ex.c, so the following headers are not mandatory, but it's to make sure that eclipse see them too */
+#include "xbt/ex.h"
+#include "xbt/str.h"
+#include "xbt/module.h"         /* xbt_binary_name */
+#include "xbt_modinter.h"       /* backtrace initialization headers */
+/* end of "useless" inclusions */
+
 extern char **environ;          /* the environment, as specified by the opengroup */
 
 /* Module creation/destruction: nothing to do on linux */
-void xbt_backtrace_init(void) { }
-void xbt_backtrace_exit(void) { }
+void xbt_backtrace_init(void)
+{
+}
+
+void xbt_backtrace_exit(void)
+{
+}
+
+void xbt_backtrace_current(xbt_ex_t * e)
+{
+  e->used = backtrace((void **) e->bt, XBT_BACKTRACE_SIZE);
+}
+
 
 void xbt_ex_setup_backtrace(xbt_ex_t * e)
 {
   int i;
 
   /* to get the backtrace from the libc */
-  char **backtrace_syms = backtrace_symbols(e->bt, e->used);
+  char **backtrace_syms;
 
   /* To build the commandline of addr2line */
   char *cmd, *curr;
 
   /* to extract the addresses from the backtrace */
-  char **addrs = xbt_new(char *, e->used);
+  char **addrs;
   char buff[256], *p;
 
   /* To read the output of addr2line */
@@ -40,7 +58,16 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e)
   struct stat stat_buf;
   char *binary_name = NULL;
 
-  e->used = backtrace((void **) e->bt, XBT_BACKTRACE_SIZE);
+  xbt_assert0(e
+              && e->used,
+              "Backtrace not setup yet, cannot set it up for display");
+
+  backtrace_syms = backtrace_symbols(e->bt, e->used);
+  /* ignore first one, which is this xbt_backtrace_current() */
+  e->used--;
+  memmove(backtrace_syms, backtrace_syms + 1, sizeof(char *) * e->used);
+  addrs = xbt_new(char *, e->used);
+
   e->bt_strings = NULL;
 
   /* Some arches only have stubs of backtrace, no implementation (hppa comes to mind) */
@@ -121,10 +148,17 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e)
   }
 
   for (i = 0; i < e->used; i++) {
+    char *fgets_res;
     DEBUG2("Looking for symbol %d, addr = '%s'", i, addrs[i]);
-    fgets(line_func, 1024, pipe);
+    fgets_res = fgets(line_func, 1024, pipe);
+    if (fgets_res == NULL)
+      THROW2(system_error, 0,
+             "Cannot run fgets to look for symbol %d, addr %s", i, addrs[i]);
     line_func[strlen(line_func) - 1] = '\0';
-    fgets(line_pos, 1024, pipe);
+    fgets_res = fgets(line_pos, 1024, pipe);
+    if (fgets_res == NULL)
+      THROW2(system_error, 0,
+             "Cannot run fgets to look for symbol %d, addr %s", i, addrs[i]);
     line_pos[strlen(line_pos) - 1] = '\0';
 
     if (strcmp("??", line_func)) {
@@ -189,7 +223,7 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e)
         continue;
       }
 
-      /* Ok, Found the offset of the maps line containing the searched symbol. 
+      /* Ok, Found the offset of the maps line containing the searched symbol.
          We now need to substract this from the address we got from backtrace.
        */
 
@@ -197,7 +231,7 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e)
       addrs[i] = bprintf("0x%0*lx", addr_len - 2, addr - offset);
       DEBUG2("offset=%#lx new addr=%s", offset, addrs[i]);
 
-      /* Got it. We have our new address. Let's get the library path and we 
+      /* Got it. We have our new address. Let's get the library path and we
          are set */
       p = xbt_strdup(backtrace_syms[i]);
       if (p[0] == '[') {
@@ -221,9 +255,15 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e)
           CRITICAL0("Cannot fork addr2line to display the backtrace");
           abort();
         }
-        fgets(line_func, 1024, subpipe);
+        fgets_res = fgets(line_func, 1024, subpipe);
+        if (fgets_res == NULL)
+          THROW1(system_error, 0, "Cannot read result of subcommand %s",
+                 subcmd);
         line_func[strlen(line_func) - 1] = '\0';
-        fgets(line_pos, 1024, subpipe);
+        fgets_res = fgets(line_pos, 1024, subpipe);
+        if (fgets_res == NULL)
+          THROW1(system_error, 0, "Cannot read result of subcommand %s",
+                 subcmd);
         line_pos[strlen(line_pos) - 1] = '\0';
         pclose(subpipe);
         free(subcmd);