Add isc_os_umask() function to get current umask

As it's impossible to get the current umask without modifying it at the
same time, initialize the current umask at the program start and keep
the loaded value internally.  Add isc_os_umask() function to access the
starttime umask.

diff --git a/lib/isc/include/isc/os.h b/lib/isc/include/isc/os.h
index b0a7d7cc9b831f31f38ad5857b63f238acdf7167..32770b992f9597917a1ebf7e0ae2d6b67320b8d4 100644 (file)
--- a/lib/isc/include/isc/os.h
+++ b/lib/isc/include/isc/os.h
@@ -14,6 +14,7 @@
 #pragma once
 
 /*! \file isc/os.h */
+#include <sys/stat.h>
 
 #include <isc/lang.h>
 #include <isc/types.h>
@@ -37,9 +38,15 @@ isc_os_ncpus(void);
 unsigned long
 isc_os_cacheline(void);
 /*%<
- * Return L1 caheline size of the CPU.
+ * Return L1 cacheline size of the CPU.
  * If L1 cache is greater than ISC_OS_CACHELINE_SIZE, ensure it is used
  * instead of constant. Is common on ppc64le architecture.
  */
 
+mode_t
+isc_os_umask(void);
+/*%<
+ * Return umask of the current process as initialized at the program start
+ */
+
 ISC_LANG_ENDDECLS

diff --git a/lib/isc/os.c b/lib/isc/os.c
index a82e92bc89c426d4f92e18da1d30aad92095c698..0ba0fab43cbeb61556251b61d8df238d08192cfc 100644 (file)
--- a/lib/isc/os.c
+++ b/lib/isc/os.c
@@ -12,6 +12,7 @@
  */
 
 #include <inttypes.h>
+#include <sys/stat.h>
 
 #include <isc/os.h>
 #include <isc/types.h>
@@ -21,6 +22,7 @@
 
 static unsigned int isc__os_ncpus = 0;
 static unsigned long isc__os_cacheline = ISC_OS_CACHELINE_SIZE;
+static mode_t isc__os_umask = 0;
 
 #ifdef HAVE_SYSCONF
 
@@ -72,6 +74,12 @@ ncpus_initialize(void) {
        }
 }
 
+static void
+umask_initialize(void) {
+       isc__os_umask = umask(0);
+       (void)umask(isc__os_umask);
+}
+
 unsigned int
 isc_os_ncpus(void) {
        return (isc__os_ncpus);
@@ -82,8 +90,14 @@ isc_os_cacheline(void) {
        return (isc__os_cacheline);
 }
 
+mode_t
+isc_os_umask(void) {
+       return (isc__os_umask);
+}
+
 void
 isc__os_initialize(void) {
+       umask_initialize();
        ncpus_initialize();
 #if defined(HAVE_SYSCONF) && defined(_SC_LEVEL1_DCACHE_LINESIZE)
        long s = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);