Fix utility robustness#16
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The rate/parallel setup used two syscalls without checking for failure: - The shared sem_t and counter pages from mmap() were used directly; on MAP_FAILED the following sem_init()/*counter access would dereference (void*)-1 and crash. Bail out with an error instead. - fork() was assumed to succeed; on -1 the worker was silently lost. Report the failure to stderr. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The SIGINT handler was named abort(int), colliding with the standard library's abort(void) declared via <stdlib.h>. It compiled only because the signatures differ, but the clash is fragile and confusing. Rename it to sigint_handler; behavior is unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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mmap()andfork()return valuesabort()