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Full Discussion: signals related question
Top Forums Programming signals related question Post 302106965 by moshe fried on Tuesday 13th of February 2007 01:43:16 PM
Old 02-13-2007
If your question is what I think it is, if your proccess is within a system call or a library call, the signal can stop that call, and the call will return an error usually. Then you can check if the SIGALRM was set (or set through your own signal handler function) to decide what to do next.
 
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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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