[libvirt] [PATCH] build: enforce files.h usage

[Eric Blake]

* cfg.mk (sc_prohibit_close): New syntax-check rule.
* src/util/pci.c (pciWaitForDeviceCleanup): Fix violation.
* .x-sc_prohibit_close: New exceptions.
* Makefile.am (EXTRA_DIST): Distribute new file.
---

As promised, here's my followup to Stefan's recent close() cleanups,
which will help us avoid further regressions.

 .x-sc_prohibit_close |    3 +++
 Makefile.am          |    1 +
 cfg.mk               |    9 +++++++++
 src/util/pci.c       |    2 +-
 4 files changed, 14 insertions(+), 1 deletions(-)
 create mode 100644 .x-sc_prohibit_close

diff --git a/.x-sc_prohibit_close b/.x-sc_prohibit_close
new file mode 100644
index 0000000..348200c
--- /dev/null
+++ b/.x-sc_prohibit_close
@@ -0,0 +1,3 @@
+^docs/.*
+^HACKING$
+^src/util/files.c$
diff --git a/Makefile.am b/Makefile.am
index d3f8876..bf1b49b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -26,6 +26,7 @@ EXTRA_DIST = \
   .x-sc_bindtextdomain \
   .x-sc_m4_quote_check \
   .x-sc_prohibit_asprintf \
+  .x-sc_prohibit_close \
   .x-sc_prohibit_empty_lines_at_EOF \
   .x-sc_prohibit_gethostby \
   .x-sc_prohibit_gethostname \
diff --git a/cfg.mk b/cfg.mk
index 0851f44..963c7db 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -231,6 +231,15 @@ sc_avoid_write:
 	halt='consider using safewrite instead of write'		\
 	  $(_sc_search_regexp)

+# Avoid functions that can lead to double-close bugs.
+sc_prohibit_close:
+	@prohibit='\<[f]close *\('					\
+	halt='use VIR_{FORCE_}[F]CLOSE instead of [f]close'		\
+	  $(_sc_search_regexp)
+	@prohibit='\<fdopen *\('					\
+	halt='use VIR_FDOPEN instead of fdopen'				\
+	  $(_sc_search_regexp)
+
 # Similar to the gnulib maint.mk rule for sc_prohibit_strcmp
 # Use STREQLEN or STRPREFIX rather than comparing strncmp == 0, or != 0.
 sc_prohibit_strncmp:
diff --git a/src/util/pci.c b/src/util/pci.c
index bd8c6c5..d38cefa 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -1095,7 +1095,7 @@ pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher)
         }
     }

-    fclose(fp);
+    VIR_FORCE_FCLOSE(fp);

     return ret;
 }
-- 
1.7.3.2