Not able to Display the Catched Signal Post: 302688547

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Top Forums UNIX for Advanced & Expert Users Not able to Display the Catched Signal Post 302688547 by alister on Sunday 19th of August 2012 03:14:59 PM

08-19-2012

Registered User

Quote:

Originally Posted by shyam.sunder91

im supposed to get the result output as Rx signal usr1 but i havnt why so Smilie

Are you certain that it isn't being printed? Are you running the binary in the background while trying to send signals to it? If so, depending on your terminal settings, an attempt to write to the terminal could stop the process. Also, note that your printf statements do not have a terminating newline. Perhaps it did print but you missed it? Perhaps the output got lost among other output, such as the shell prompt? Depending on how you called it, perhaps its stdout has been redirected?

Quote:

Originally Posted by shyam.sunder91

Code:

        while(1);
        pause();

Your code spins needlessly. while (1); cpu usage will hit 100% and pause() is never reached. You can accomplish your goal without using any cpu between signals: while (1) pause(); or even while (pause());

Regards,
Alister

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pause

PAUSE(3)						   BSD Library Functions Manual 						  PAUSE(3)

NAME

     pause -- stop until signal

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     pause(void);

DESCRIPTION

     Pause is made obsolete by sigsuspend(2).

     The pause() function forces a process to pause until a signal is received from either the kill(2) function or an interval timer.  (See
     setitimer(2).)  Upon termination of a signal handler started during a pause(), the pause() call will return.

RETURN VALUES

     Always returns -1.

ERRORS

     The pause() function always returns:

     [EINTR]		The call was interrupted.

SEE ALSO

     kill(2), poll(2), select(2), setitimer(2), sigsuspend(2)

STANDARDS

     The pause() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY

     A pause() syscall appeared in Version 6 AT&T UNIX.

BSD
								   June 4, 1993 							       BSD