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Add isc_os_umask() function to get current umask

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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.
This commit is contained in:
Ondřej Surý 2023-03-31 10:06:03 +02:00
parent d664e3c612
commit aca7dd3961
2 changed files with 22 additions and 1 deletions
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9
lib/isc/include/isc/os.h
View File

@ -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

14
lib/isc/os.c
View File

@ -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);