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Annotated edit history of Signal version 7, including all changes. View license author blame.
Rev Author # Line
3 JohnMcPherson 1 A signal is basically a message sent from one process to another, indicating a change of state.
1 AristotlePagaltzis 2
3 Different versions of [Unix] use different names and/or numbers for some of the lesser used signals. See the signal(7) man-page. You can find the signals and numbers used in the [POSIX] standard, in <tt>/usr/include/bits/signum.h</tt> on a [Linux] system, or by invoking <tt>kill -l</tt>.
4
5 # [SIGHUP]
6 # [SIGINT]
7 # [SIGQUIT]
8 # [SIGILL]
9 # [SIGTRAP]
2 PerryLorier 10 # [SIGABRT] (aka [SIGIOT])
1 AristotlePagaltzis 11 # [SIGBUS]
12 # [SIGFPE]
13 # [SIGKILL]
14 # [SIGUSR1]
15 # [SIGSEGV]
16 # [SIGUSR2]
17 # [SIGPIPE]
18 # [SIGALRM]
19 # [SIGTERM]
20 # [SIGSTKFLT]
21 # [SIGCHLD]
22 # [SIGCONT]
23 # [SIGSTOP]
24 # [SIGTSTP]
25 # [SIGTTIN]
26 # [SIGTTOU]
27 # [SIGURG]
28 # [SIGXCPU]
29 # [SIGXFSZ]
30 # [SIGVTALRM]
31 # [SIGPROF]
32 # [SIGWINCH]
33 # [SIGIO]
34 # [SIGPWR]
35 # [SIGSYS]
5 BenStaz 36
37 !Hotkeys for some of the above symbols.
38
39 These hotkeys can be found by typing:
40
41 *stty -a
42
7 AndreasFerber 43 intr = ^C; quit = ^\; susp = ^Z
5 BenStaz 44 <verbatim>
45 intr = [SIGINT]
46 quit = [SIGQUIT]
47 susp = [SIGSTOP]
48 </verbatim>
6 BenStaz 49
50 Some people have a misconception that CTRL-S and CTRL-Q send a [SIGSTOP] and [SIGCONT] signal respectively.
51
52 This is not the case!
53
54 CTRL-S and CTRL-Q are used to control the flow of output to the terminal. CTRL-S tells the system not to send any more data to the screen until a CTRL-Q is pressed. You can use these to control fast scrolling output.
4 IanMcDonald 55
56 Here are a couple of pages that show how to code for signals:<br>
57 http://users.actcom.co.il/~choo/lupg/tutorials/signals/signals-programming.html<br>
58 http://www.gnu.org/software/libc/manual/html_node/Signal-Handling.html

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