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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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KILL(2) 							System Calls Manual							   KILL(2)

NAME
kill - send signal to a process SYNOPSIS
kill(pid, sig); DESCRIPTION
Kill sends the signal sig to the process specified by the process number in r0. See signal(2) for a list of signals. The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user. If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4). If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler and initialization processes, see init(8). Processes may send signals to themselves. SEE ALSO
signal(2), kill(1) DIAGNOSTICS
Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user ID and the user is not super-user, or if the process does not exist. ASSEMBLER
(kill = 37.) (process number in r0) sys kill; sig KILL(2)
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