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c1cdd265

by Moritz Angermann at 2025-09-10T10:48:35-04:00

testsuite: Fix broken exec_signals_child.c

There is no signal 0. The signal mask is 1-32.

@@ -2,8 +2,11 @@
  #include <stdio.h>
  #include <errno.h>
 -// Prints the state of the signal handlers to stdout
 -int main()
 +// Prints the state of the signal handlers to stdout.
 +// NOTE: We intentionally start at signal 1 (not 0). Signal number 0 is not a
 +// real signal; passing 0 to sigismember/sigaction is undefined behaviour and
 +// on Darwin was observed to yield memory corruption / junk bytes in output.
 +int main(void)
+ {
      int open = 0, i;
      sigset_t blockedsigs;
@@ -11,7 +14,7 @@ int main()
      printf("ChildInfo { masked = [");
      sigprocmask(SIG_BLOCK, NULL, &blockedsigs);
 -    for(i = 0; i < NSIG; ++i)
 +    for(i = 1; i < NSIG; ++i)
+     {
          int ret = sigismember(&blockedsigs, i);
          if(ret >= 0)
@@ -26,7 +29,7 @@ int main()
      printf("], handlers = [");
      open = 0;
 -    for(i = 0; i < NSIG; ++i)
 +    for(i = 1; i < NSIG; ++i)
+     {
          struct sigaction old;
          if(sigaction(i, NULL, &old) >= 0)