Date: 21 Jul 2001 17:36:59 +0200 From: Dag-Erling Smorgrav <des@ofug.org> To: Damien Tougas <damien@carroll.com> Cc: chat@FreeBSD.ORG Subject: Re: C newbie needs help with kqueue Message-ID: <xzp3d7quwdg.fsf@flood.ping.uio.no> In-Reply-To: <2042320000.995728574@sprig.tougas.net>
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Damien Tougas <damien@carroll.com> writes:
> #include <stdio.h>
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/event.h>
> #include <sys/time.h>
Wrong header ordering; <sys/types.h> always comes first, followed by
other sys headers in alphabetical order, followed by standard headers
in alphabetical order.
> int main(int argc, char *argv[]) {
int
main(int argc, char *argv[])
{
> if ((fp = fopen("/var/log/messages", "r")) == NULL) {
> perror("Cannot open file\n");
> return -1;
Don't use perror(3). Never return from main(), use exit(3) instead
(err(3) in this case) to flag it as an exit point. Valid exit codes
are 0-255 only.
> }
Incorrect brace placement.
> if (kq = kqueue() < 0) {
> perror("Cannot create kqueue");
> }
If you were using the right compiler options (i.e. at least -Wall),
the compiler would warn you that the < operator has higher precedence
than the = operator.
DES
--
Dag-Erling Smorgrav - des@ofug.org
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