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patch 8.2.3327: no check for sysconf() failing

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Problem:    No check for sysconf() failing.
Solution:   If sysconf() fails use SIGSTKSZ for the signal stack size.
            (Zdenek Dohnal, closes #8743)
This commit is contained in:
Zdenek Dohnal
2021-08-11 14:20:05 +02:00
committed by Bram Moolenaar
parent 6e48b84c5f
commit ba9c23e776
2 changed files with 29 additions and 19 deletions
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46
src/os_unix.c
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@@ -783,16 +783,36 @@ mch_stackcheck(char *p)
* 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
/*
* 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
@@ -806,21 +826,13 @@ init_signal_stack(void)
# 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_size = get_signal_stack_size();
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_sp += get_signal_stack_size() - 1;
sigstk.ss_onstack = 0;
(void)sigstack(&sigstk, NULL);
# endif
@@ -3278,11 +3290,7 @@ mch_early_init(void)
* 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
signal_stack = alloc(get_signal_stack_size());
init_signal_stack();
#endif
}

2
src/version.c
View File

@@ -755,6 +755,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
3327,
/**/
3326,
/**/