Messages in this thread | | | Date | Sat, 15 Feb 2003 02:14:02 -0300 | From | Werner Almesberger <> | Subject | Re: Synchronous signal delivery.. |
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I wrote: > ssize_t overwrite(int fd, > const void *data_if_empty,size_t size_if_empty, > const void *data_if_full,size_t size_if_full, > int *was_empty);
Bah, rubbish. Make this
ssize_t overwrite(int fd,const void *data,size_t size);
If the pipe/queue is empty, don't write, and return 0. Now, this could probably be implemented with a flag to send(2) (then this wouldn't work for pipes, but you could use socketpair(2) for a similar effect). Example:
void add_signal(int signum) { static int signal_set = 0; int new_signal = 1 << signum; int sent;
signal_set |= new_signal; sent = send(fd,&signal_set,sizeof(int),MSG_OVERWRITE); if (!sent) { send(fd,&new_signal,sizeof(int),0); signal_set = new_signal; } }
- Werner
-- _________________________________________________________________________ / Werner Almesberger, Buenos Aires, Argentina wa@almesberger.net / /_http://www.almesberger.net/____________________________________________/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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