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[!14787] testsuite: Fix broken exec_signals_child.c #72

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[!14787] testsuite: Fix broken exec_signals_child.c #72

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11 changes: 7 additions & 4 deletions testsuite/tests/rts/exec_signals_child.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,16 +2,19 @@
#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;

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)
Expand All @@ -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)
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