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authorRich Felker <dalias@aerifal.cx>2011-06-07 02:42:55 -0400
committerRich Felker <dalias@aerifal.cx>2011-06-07 02:42:55 -0400
commitede353d8e5c9198cf467aad95e49a496020898ed (patch)
tree446c42bc09c75f1de7e0db696701920f813b4c56 /src/mq
parentab11386aaaffc93755ff86199bf753a6d5ef4b45 (diff)
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implement mq_notify
Diffstat (limited to 'src/mq')
-rw-r--r--src/mq/mq_notify.c67
1 files changed, 65 insertions, 2 deletions
diff --git a/src/mq/mq_notify.c b/src/mq/mq_notify.c
index d85db1da..60bb2db2 100644
--- a/src/mq/mq_notify.c
+++ b/src/mq/mq_notify.c
@@ -1,10 +1,73 @@
#include <mqueue.h>
#include <pthread.h>
#include <errno.h>
+#include <sys/socket.h>
+#include <signal.h>
+#include <unistd.h>
#include "syscall.h"
+struct args {
+ pthread_barrier_t barrier;
+ int sock;
+ const struct sigevent *sev;
+};
+
+void *start(void *p)
+{
+ struct args *args = p;
+ char buf[32];
+ ssize_t n;
+ int s = args->sock;
+ void (*func)(union sigval) = args->sev->sigev_notify_function;
+ union sigval val = args->sev->sigev_value;
+
+ pthread_barrier_wait(&args->barrier);
+ n = recv(s, buf, sizeof(buf), MSG_NOSIGNAL|MSG_WAITALL);
+ close(s);
+ if (n==sizeof buf && buf[sizeof buf - 1] == 1)
+ func(val);
+ return 0;
+}
+
int mq_notify(mqd_t mqd, const struct sigevent *sev)
{
- errno = ENOSYS;
- return -1;
+ struct args args = { .sev = sev };
+ pthread_attr_t attr;
+ pthread_t td;
+ int s;
+ struct sigevent sev2;
+ static const char zeros[32];
+
+ if (!sev || sev->sigev_notify != SIGEV_THREAD)
+ return syscall(SYS_mq_notify, mqd, sev);
+
+ s = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, 0);
+ if (s < 0) return -1;
+ args.sock = s;
+
+ if (sev->sigev_notify_attributes) attr = *sev->sigev_notify_attributes;
+ else pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ pthread_barrier_init(&args.barrier, 0, 2);
+
+ if (pthread_create(&td, &attr, start, &args)) {
+ __syscall(SYS_close, s);
+ errno = EAGAIN;
+ return -1;
+ }
+
+ pthread_barrier_wait(&args.barrier);
+ pthread_barrier_destroy(&args.barrier);
+
+ sev2.sigev_notify = SIGEV_THREAD;
+ sev2.sigev_signo = s;
+ sev2.sigev_value.sival_ptr = &zeros;
+
+ if (syscall(SYS_mq_notify, mqd, &sev2) < 0) {
+ pthread_cancel(td);
+ __syscall(SYS_close, s);
+ return -1;
+ }
+
+ return 0;
}