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setup_signals: use sysconf(_SC_SIGSTKSZ) when available

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nick black 2025-01-02 03:10:50 -05:00
parent ee50c6f006
commit 90bf8ba847
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1 changed files with 9 additions and 4 deletions
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13
src/lib/unixsig.c
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@ -212,15 +212,20 @@ int setup_signals(void* vnc, bool no_quit_sigs, bool no_winch_sigs,
// to export ASAN_OPTIONS=use_sigaltstack=0, or just not fuck with the alternate
// signal stack when built with ASAN.
#ifndef USE_ASAN
alt_signal_stack.ss_size = SIGSTKSZ * 4;
alt_signal_stack.ss_sp = malloc(alt_signal_stack.ss_size);
long minstksz = sysconf(_SC_SIGSTKSZ);
if(minstksz <= 0){
minstksz = SIGSTKSZ * 4;
}
alt_signal_stack.ss_sp = malloc(minstksz);
if(alt_signal_stack.ss_sp == NULL){
fprintf(stderr, "warning: couldn't create alternate signal stack (%s)" NL, strerror(errno));
fprintf(stderr, "warning: couldn't create %ldB alternate signal stack (%s)" NL, minstksz, strerror(errno));
}else{
alt_signal_stack.ss_size = minstksz;
if(sigaltstack(&alt_signal_stack, NULL)){
fprintf(stderr, "warning: couldn't set up alternate signal stack (%s)" NL, strerror(errno));
fprintf(stderr, "warning: couldn't set up %ldB alternate signal stack (%s)" NL, minstksz, strerror(errno));
free(alt_signal_stack.ss_sp);
alt_signal_stack.ss_sp = NULL;
alt_signal_stack.ss_size = 0;
}else{
sa.sa_flags = SA_ONSTACK;
}