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Top Forums UNIX for Dummies Questions & Answers what's the difference between signal and semaphore? Post 302524097 by stackpop on Saturday 21st of May 2011 12:06:58 PM
Old 05-21-2011
thank you~
I find some answers that the Signal is a technical which is equal to soft interruption.
And a signal can only tell a process what happened,but it can't send data buffers to other process.

Are all these understanding right?

But I just see the signal used to tell the process itself what happened not another process.
 

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pause(2)							   System Calls 							  pause(2)

NAME
pause - suspend process until signal SYNOPSIS
#include <unistd.h> int pause(void); DESCRIPTION
The pause() function suspends the calling process until it receives a signal. The signal must be one that is not currently set to be ignored by the calling process. If the signal causes termination of the calling process, pause() does not return. If the signal is caught by the calling process and control is returned from the signal-catching function (see signal(3C)), the calling process resumes execution from the point of suspension. RETURN VALUES
Since pause() suspends thread execution indefinitely unless interrupted by a signal, there is no successful completion return value. If interrupted, it returns -1 and sets errno to indicate the error. ERRORS
The pause() function will fail if: EINTR A signal is caught by the calling process and control is returned from the signal-catching function. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
alarm(2), kill(2), signal(3C), wait(3C), attributes(5), standards(5) SunOS 5.11 28 Dec 1996 pause(2)
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