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Full Discussion: alarm signal processing
Top Forums Programming alarm signal processing Post 302323078 by mgessner on Friday 5th of June 2009 10:25:06 AM
Old 06-05-2009
I think your approach using alarm and checking the return value of read makes sense. You should get back EINTR because the alarm signal handler went off.

Also, have you considered using select for this? Some implementations of select modify the timeout variable to indicate the amount of time not slept. You could use this to keep track of how much time you're willing to continue to sleep for the next select in the case of partial reads. Linux behaves this way. If you're not using Linux, you could use another function to track how long you've been in the function.

HTH
 

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LEARN ABOUT MOJAVE

alarm

ALARM(3)						   BSD Library Functions Manual 						  ALARM(3)

NAME

     alarm -- set signal timer alarm

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     unsigned
     alarm(unsigned seconds);

DESCRIPTION

     This interface is made obsolete by setitimer(2).

     The alarm() function sets a timer to deliver the signal SIGALRM to the calling process after the specified number of seconds.  If an alarm
     has already been set with alarm() but has not been delivered, another call to alarm() will supersede the prior call.  The request alarm(0)
     voids the current alarm and the signal SIGALRM will not be delivered.

     Due to setitimer(2) restriction the maximum number of seconds allowed is 100000000.

RETURN VALUES

     The return value of alarm() is the amount of time left on the timer from a previous call to alarm().  If no alarm is currently set, the
     return value is 0.

SEE ALSO

     setitimer(2), sigaction(2), sigpause(2), sigvec(2), signal(3), sleep(3), ualarm(3), usleep(3)

HISTORY

     An alarm() function appeared in Version 7 AT&T UNIX.

BSD
								  April 19, 1994							       BSD
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