overhaul cancellation to fix resource leaks and dangerous behavior with signals

[musl] / src / process / waitpid.c

#include <sys/wait.h>
#include "syscall.h"
#include "libc.h"

pid_t waitpid(pid_t pid, int *status, int options)
{
        int r;
        CANCELPT_BEGIN;
        r = syscall(SYS_wait4, pid, status, options, 0);
        if (r<0) CANCELPT_TRY;
        CANCELPT_END;
        return r;
}