X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=daemon%2Fdebug.c;h=6d6d2b59a5f1176aaf7b30e36ca9501aa4fe969c;hb=5cd39c83e23eb300d1bdfa806902a31b409ff420;hp=fc1053164b4364f02cc43d412492e468e7d45cdc;hpb=012a2ec1acf7a7a2d859f78ea4932ae9fb30522d;p=libguestfs.git

diff --git a/daemon/debug.c b/daemon/debug.c
index fc10531..6d6d2b5 100644
--- a/daemon/debug.c
+++ b/daemon/debug.c
@@ -46,11 +46,13 @@ struct cmd {
 
 static char *debug_help (const char *subcmd, int argc, char *const *const argv);
 static char *debug_fds (const char *subcmd, int argc, char *const *const argv);
+static char *debug_segv (const char *subcmd, int argc, char *const *const argv);
 static char *debug_sh (const char *subcmd, int argc, char *const *const argv);
 
 static struct cmd cmds[] = {
   { "help", debug_help },
   { "fds", debug_fds },
+  { "segv", debug_segv },
   { "sh", debug_sh },
   { NULL, NULL }
 };
@@ -114,15 +116,24 @@ static char *
 debug_fds (const char *subcmd, int argc, char *const *const argv)
 {
   int r;
-  char *out = NULL;
+  char *out;
+  size_t size;
+  FILE *fp;
   DIR *dir;
   struct dirent *d;
   char fname[256], link[256];
   struct stat statbuf;
 
+  fp = open_memstream (&out, &size);
+  if (!fp) {
+    reply_with_perror ("open_memstream");
+    return NULL;
+  }
+
   dir = opendir ("/proc/self/fd");
   if (!dir) {
     reply_with_perror ("opendir: /proc/self/fd");
+    fclose (fp);
     return NULL;
   }
 
@@ -135,6 +146,7 @@ debug_fds (const char *subcmd, int argc, char *const *const argv)
     r = lstat (fname, &statbuf);
     if (r == -1) {
       reply_with_perror ("stat: %s", fname);
+      fclose (fp);
       free (out);
       closedir (dir);
       return NULL;
@@ -144,24 +156,20 @@ debug_fds (const char *subcmd, int argc, char *const *const argv)
       r = readlink (fname, link, sizeof link - 1);
       if (r == -1) {
 	reply_with_perror ("readline: %s", fname);
+	fclose (fp);
 	free (out);
 	closedir (dir);
 	return NULL;
       }
       link[r] = '\0';
 
-      r = catprintf (&out, "%2s %s\n", d->d_name, link);
+      fprintf (fp, "%2s %s\n", d->d_name, link);
     } else
-      r = catprintf (&out, "%2s 0%o\n", d->d_name, statbuf.st_mode);
-
-    if (r == -1) {
-      reply_with_perror ("catprintf");
-      free (out);
-      closedir (dir);
-      return NULL;
-    }
+      fprintf (fp, "%2s 0%o\n", d->d_name, statbuf.st_mode);
   }
 
+  fclose (fp);
+
   if (closedir (dir) == -1) {
     reply_with_perror ("closedir");
     free (out);
@@ -171,6 +179,14 @@ debug_fds (const char *subcmd, int argc, char *const *const argv)
   return out;
 }
 
+/* Force a segfault in the daemon. */
+static char *
+debug_segv (const char *subcmd, int argc, char *const *const argv)
+{
+  *(int*)0 = 0;
+  return NULL;
+}
+
 /* Run an arbitrary shell command. */
 static char *
 debug_sh (const char *subcmd, int argc, char *const *const argv)