Date: Wed, 14 Oct 1998 10:12:57 -0600 (MDT) From: Darren Whittaker <djw@sage1.sagecorp.com> To: Mike Smith <mike@smith.net.au> Cc: freebsd-current@FreeBSD.ORG, john.young@openmarket.com Subject: Re: problem in 3.0 Message-ID: <Pine.SOL.3.93.981014101158.9432A-100000@sage1.sagecorp.com> In-Reply-To: <199810141601.JAA01049@dingo.cdrom.com>
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The fact of the matter is that date only returned output once, why did it
not return output 10 times?
-Darren
------------------
Darren Whittaker
Senior Software Engineer
Small Enterprise Group
Open Market, Inc.
On Wed, 14 Oct 1998, Mike Smith wrote:
> > Thank you for your email. I have taken your code and modified it to run as
> > a cgi:
> >
> > #include <stdio.h>
> > #include <err.h>
> > #include <errno.h>
> >
> > int main(int argc, char *argv[])
> > {
> > int i, j;
> > char buf[256];
> > FILE *p;
> >
> > /* output the head */
> > printf("Content-type: text/html\n");
> > fflush(stdout);
> > printf("\n<html><head><title>TESTING</title></head>");
> > printf("<CENTER><H1>TESTING</CENTER></H1><HR>\n");
> > printf("<body bgcolor=#ffffff><p><pre>\n");
> > fflush(stdout);
> >
> > /* loop using popen */
> > for (i = 0; i < 10; i++)
> > {
> > buf[0] = '\0';
> > if ((p = popen("/bin/date", "r")) == NULL)
> > {
> > printf("popen error: %s\n",strerror(errno));
> > continue;
> > }
> > fgets(buf, sizeof(buf) - 1, p);
> > printf(buf);
> >
> > if ((j = pclose(p)) != 0)
> > printf("pclose error: %s [%d]\n",strerror(j),j);
>
> This is incorrect; it should read
>
> if (pclose(p) == -1)
> printf("pclose error: %s [%d]\n", strerror(errno), errno);
>
> See the manpage for pclose().
>
> > Here is some of the output when I run it from the web browser:
> >
> > Wed Oct 14 07:00:13 PDT 1998
> > pclose error: No child processes [10]
> ...
> > What do you think the problem might be?
>
> A return value of 10 from pclose() is not an error; it's the exit code
> of the child process. /bin/date does not appear to reliably set its
> exit code.
>
> --
> \\ Sometimes you're ahead, \\ Mike Smith
> \\ sometimes you're behind. \\ mike@smith.net.au
> \\ The race is long, and in the \\ msmith@freebsd.org
> \\ end it's only with yourself. \\ msmith@cdrom.com
>
>
>
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