You need to fork off a new process then exec the tool from the child.
The child process does not return. You can open pipes prior to the
fork, since the parent and child process share file descriptors.
Something like this:
int socks[2];
/* open socket pair */
int retval = pipe(socks);
if (retval < 0)
perror("opening socket pair");
/* fork off a child process */
pid_t pid = fork();
if (pid == -1)
perror("Failed to fork\n");
if (pid == 0) {
/* child process */
close(socks[1]);
dup2(socks[1], 2);
close(socks[0]);
execl(cmd, cmd, arg1, arg2, 0);
// exec only returns on failure
perror("Didnt exec.");
exit(EXIT_FAILURE);
}
I hope this is clear, I've just woken so my brain's a bit mushy. The
man pages are your friend, but if you need further info, dont hesitate
to ask.
On 22/12/2005, at 9:08 AM, Kevin Packard wrote:
Please forgive me if this is not the appropriate list, but I've not
been unable to google the answer, or find it in Apple's dev pages.
Is there any way to programatically interact with a UNIX tool from a
Carbon app? sysctl() gives me a one-shot run, but I'd like to launch
a tool, create some sort of a pipe to it, write to its stdin, and read
from its stdout.
Can someone please point me to a method to do this (or tell me I'm
insane)?
thanks,
--
Kevin Packard
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