09-16-2003
Quote:
Originally posted by Perderabo
Posting a couple of lines from a c program is not enough to do any good.
The only debugging tool that I ever use is to insert a printf statement at strategic points in my program to see what's happening. It's low tech, I know. But it actually works very well.
It's probably a better idea to use fprintf(stderr, ... ) so that any errors are IMMEDIATELY reported. Otherwise, your program may die before the stdout buffer makes it to the screen. I've had this happen MANY times where the last debugging line on the screen did NOT indicate where the program REALLY died. Either use stderr or use fflush() after writing to a log file.
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ALARM(2) Linux Programmer's Manual ALARM(2)
NAME
alarm - set an alarm clock for delivery of a signal
SYNOPSIS
#include <unistd.h>
unsigned int alarm(unsigned int seconds);
DESCRIPTION
alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds.
If seconds is zero, no new alarm() is scheduled.
In any event any previously set alarm() is canceled.
RETURN VALUE
alarm() returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no pre-
viously scheduled alarm.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD.
NOTES
alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other.
sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad idea.
Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.
SEE ALSO
gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-06-12 ALARM(2)