Hi David,
Not sure if your message below was meant as a reply-all or not,
but I've brought it back onto the list.
There are some problems with your test program --
it's not actually using pselect() in proper way, which is:
/* Block signals that will be later unblocked by pselect() */
sigemptyset(&block);
sigaddset(&block, SIGINT);
sigprocmask(SIG_BLOCK, &block, NULL);
sigemptyset(&set);
status = my_pselect(1, &s, NULL, NULL, &timeout, &set);
If I change your program to do something like the above, I also
do not see a message from the handler -- i.e., it is not being
called, and I'm pretty sure it should be.
Below, is my modified version of your program -- it uses SIGINT.
Cheers,
Michael
#define _GNU_SOURCE
#include <syscall.h>
#include <unistd.h>
#include <signal.h>
#include <sys/select.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#define __NR_pselect6 289
static int my_pselect(int n,
fd_set *readfds, fd_set *writefds, fd_set
*exceptfds, const struct timespec *timeout, sigset_t *sigmask)
{
struct {
sigset_t *set;
size_t size;
} __attribute__((packed)) arg6;
arg6.size = 8;
arg6.set = sigmask;
return syscall(__NR_pselect6, n, readfds, writefds,
exceptfds, timeout, &arg6);
}
static void usr1_handler(int signo)
{
write(1, "handler called\n", 20);
}
int main(void)
{
fd_set s;
int status;
sigset_t set, block;
struct timespec timeout;
timeout.tv_sec = 30;
timeout.tv_nsec = 0;
FD_ZERO(&s);
FD_SET(0, &s);
signal(SIGINT, usr1_handler);
sigemptyset(&block);
sigaddset(&block, SIGINT);
sigprocmask(SIG_BLOCK, &block, NULL);
sigemptyset(&set);
status = my_pselect(1, &s, NULL, NULL, &timeout, &set);
printf("status=%d\n", status);
if (status == -1) perror("pselect");
}
--- Weitergeleitete Nachricht ---
Von: David Woodhouse <[email protected]>
An: Michael Kerrisk <[email protected]>
Betreff: Re: Add pselect, ppoll system calls.
Datum: Fri, 05 Aug 2005 13:03:14 +0100
This is the test program I used. I send it SIGUSR1 manually.
#define __USE_MISC
#include <unistd.h>
#include <signal.h>
#include <sys/select.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#define __NR_pselect6 273
int my_pselect(int n, fd_set *readfds, fd_set *writefds, fd_set
*exceptfds, const struct timespec *timeout, const sigset_t *sigmask)
{
struct {
sigset_t *set;
size_t size;
} __attribute__((packed)) arg6;
arg6.size = 8;
arg6.set = sigmask;
return syscall(__NR_pselect6, n, readfds, writefds, exceptfds,
timeout, &arg6);
}
void usr1_handler(int signo)
{
write(1, "usr1_handler called\n", 20);
}
int main(void)
{
fd_set s;
int p;
char buf[80];
sigset_t set;
fcntl(0, F_SETFL, O_NONBLOCK | fcntl(0, F_GETFL));
FD_ZERO(&s);
FD_SET(0, &s);
sigfillset(&set);
signal(SIGUSR1, usr1_handler);
printf("I am %d\n", getpid());
while (1) {
printf("Block usr1\n");
fflush(stdout);
sigaddset(&set, SIGUSR1);
my_pselect(1, &s, NULL, NULL, NULL, &set);
read(0, buf, 80);
printf("Allow usr1\n");
fflush(stdout);
sigdelset(&set, SIGUSR1);
my_pselect(1, &s, NULL, NULL, NULL, &set);
read(0, buf, 80);
}
}
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