Hello,
It looks like the system() function as used with linuxthreads (or on
sparc) doesn't block SIGCHLD but resets the default handler instead,
which may result in lost signals if a custom handler was installed.
Attached is a small source file that demonstrates the issue. A patch
will follow as a reply to this message.
Thanks.
--
Richard Braun
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
static void die(const char *f)
{
perror(f);
exit(EXIT_FAILURE);
}
#define MSG "SIGCHLD received\n"
static void handle_sigchld(int signum)
{
(void)signum;
write(1, MSG, sizeof(MSG) - 1);
}
int main(int argc, char *argv[])
{
struct sigaction sa;
char tmp[64];
int ret;
sa.sa_handler = handle_sigchld;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
ret = sigaction(SIGCHLD, &sa, NULL);
if (ret)
die("sigaction");
snprintf(tmp, sizeof(tmp), "kill -CHLD %d", getpid());
ret = system(tmp);
if (ret == -1)
die("system");
return EXIT_SUCCESS;
}
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