Patch 8.2.3327

[Bram Moolenaar]

Patch 8.2.3327
Problem: No check for sysconf() failing.
Solution: If sysconf() fails use SIGSTKSZ for the signal stack size.
(Zdenek Dohnal, closes #8743)
Files: src/os_unix.c


*** ../vim-8.2.3326/src/os_unix.c 2021-06-23 21:13:17.325564860 +0200
--- src/os_unix.c 2021-08-11 14:17:33.735510397 +0200
***************
*** 783,798 ****
* completely full.
*/

- #if !defined SIGSTKSZ && !defined(HAVE_SYSCONF_SIGSTKSZ)
- # define SIGSTKSZ 8000 // just a guess of how much stack is needed...
- #endif
-
# ifdef HAVE_SIGALTSTACK
static stack_t sigstk; // for sigaltstack()
# else
static struct sigstack sigstk; // for sigstack()
# endif

static char *signal_stack;

static void
--- 783,818 ----
* completely full.
*/

# ifdef HAVE_SIGALTSTACK
static stack_t sigstk; // for sigaltstack()
# else
static struct sigstack sigstk; // for sigstack()
# endif

+ /*
+ * Get a size of signal stack.
+ * Preference (if available): sysconf > SIGSTKSZ > guessed size
+ */
+ static long int get_signal_stack_size()
+ {
+ # ifdef HAVE_SYSCONF_SIGSTKSZ
+ long int size = -1;
+
+ // return size only if sysconf doesn't return an error
+ if ((size = sysconf(_SC_SIGSTKSZ)) > -1)
+ return size;
+ # endif
+
+ # ifdef SIGSTKSZ
+ // if sysconf() isn't available or gives error, return SIGSTKSZ
+ // if defined
+ return SIGSTKSZ;
+ # endif
+
+ // otherwise guess the size
+ return 8000;
+ }
+
static char *signal_stack;

static void
***************
*** 806,826 ****
# else
sigstk.ss_sp = signal_stack;
# endif
! # ifdef HAVE_SYSCONF_SIGSTKSZ
! sigstk.ss_size = sysconf(_SC_SIGSTKSZ);
! # else
! sigstk.ss_size = SIGSTKSZ;
! # endif
sigstk.ss_flags = 0;
(void)sigaltstack(&sigstk, NULL);
# else
sigstk.ss_sp = signal_stack;
if (stack_grows_downwards)
! # ifdef HAVE_SYSCONF_SIGSTKSZ
! sigstk.ss_sp += sysconf(_SC_SIGSTKSZ) - 1;
! # else
! sigstk.ss_sp += SIGSTKSZ - 1;
! # endif
sigstk.ss_onstack = 0;
(void)sigstack(&sigstk, NULL);
# endif
--- 826,838 ----
# else
sigstk.ss_sp = signal_stack;
# endif
! sigstk.ss_size = get_signal_stack_size();
sigstk.ss_flags = 0;
(void)sigaltstack(&sigstk, NULL);
# else
sigstk.ss_sp = signal_stack;
if (stack_grows_downwards)
! sigstk.ss_sp += get_signal_stack_size() - 1;
sigstk.ss_onstack = 0;
(void)sigstack(&sigstk, NULL);
# endif
***************
*** 3278,3288 ****
* Ignore any errors.
*/
#if defined(HAVE_SIGALTSTACK) || defined(HAVE_SIGSTACK)
! # ifdef HAVE_SYSCONF_SIGSTKSZ
! signal_stack = alloc(sysconf(_SC_SIGSTKSZ));
! # else
! signal_stack = alloc(SIGSTKSZ);
! # endif
init_signal_stack();
#endif
}
--- 3290,3296 ----
* Ignore any errors.
*/
#if defined(HAVE_SIGALTSTACK) || defined(HAVE_SIGSTACK)
! signal_stack = alloc(get_signal_stack_size());
init_signal_stack();
#endif
}
*** ../vim-8.2.3326/src/version.c 2021-08-10 22:51:59.369449616 +0200
--- src/version.c 2021-08-11 14:19:01.783323507 +0200
***************
*** 757,758 ****
--- 757,760 ----
{ /* Add new patch number below this line */
+ /**/
+ 3327,
/**/