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Full Discussion: Nanosleep in signal call
Top Forums Programming Nanosleep in signal call Post 302963454 by jim mcnamara on Wednesday 30th of December 2015 06:33:56 PM
Old 12-30-2015
I believe rand() is not async safe as well - you cannot have interruptible calls in your signal handler. Well make that should not have. It uses global variables which is another problem. Plus you are doing a lot in your signal handler, so also consider blocking SIGUSR1 as the first step in your handler. Multiple signals can mess up your code otherwise - especially the rand() call. New applications should use the POSIX signal API (sigaction(2), sigprocmask(2), etc.) which is what you did and that is good.

Next:
Code:
signal_name = "SIGUSR1";

could SEGFAULT, but in any case it is undefined behavior: const *signal_name;

Last edited by jim mcnamara; 12-30-2015 at 07:39 PM..
 

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KILL(1) 						    BSD General Commands Manual 						   KILL(1)

NAME
kill -- terminate or signal a process SYNOPSIS
kill [-s signal_name] pid ... kill -l [exit_status] kill -signal_name pid ... kill -signal_number pid ... DESCRIPTION
The kill utility sends a signal to the processes specified by the pid operand(s). Only the super-user may send signals to other users' processes. The options are as follows: -s signal_name A symbolic signal name specifying the signal to be sent instead of the default TERM. -l [exit_status] If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status. -signal_name A symbolic signal name specifying the signal to be sent instead of the default TERM. -signal_number A non-negative decimal integer, specifying the signal to be sent instead of the default TERM. The following pids have special meanings: -1 If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user. Some of the more commonly used signals: 1 HUP (hang up) 2 INT (interrupt) 3 QUIT (quit) 6 ABRT (abort) 9 KILL (non-catchable, non-ignorable kill) 14 ALRM (alarm clock) 15 TERM (software termination signal) Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page. SEE ALSO
builtin(1), csh(1), killall(1), ps(1), kill(2), sigaction(2) STANDARDS
The kill function is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A kill command appeared in Version 6 AT&T UNIX. BUGS
A replacement for the command ``kill 0'' for csh(1) users should be provided. BSD
April 28, 1995 BSD
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