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1 | .\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl> |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
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12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
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20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" This replaces an earlier man page written by Walter Harms | |
| 24 | .\" <walter.harms@informatik.uni-oldenburg.de>. | |
| 25 | .TH GSIGNAL 3 2002-08-25 "notGNU" "Linux Programmer's Manual" | |
| 26 | .SH NAME | |
| 27 | gsignal, ssignal \- software signal facility | |
| 28 | .SH SYNOPSIS | |
| 29 | .nf | |
| 30 | .B #include <signal.h> | |
| 31 | .sp | |
| 32 | .B typedef void (*sighandler_t)(int); | |
| 33 | .sp | |
| 34 | .BI "int gsignal(" signum ); | |
| 35 | .sp | |
| 36 | .BI "sighandler_t ssignal(int " signum ", sighandler_t " action ); | |
| 37 | .SH DESCRIPTION | |
| 38 | Don't use these functions under Linux. | |
| 39 | Due to a historical mistake, under Linux these functions are | |
| 40 | aliases for | |
| 31e9a9ec | 41 | .BR raise () |
| fea681da | 42 | and |
| 31e9a9ec | 43 | .BR signal (), |
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44 | respectively. |
| 45 | .LP | |
| 80b50848 | 46 | Elsewhere, on System V-like systems, these functions implement |
| fea681da | 47 | software signalling, entirely independent of the classical |
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48 | signal and kill functions. |
| 49 | The function | |
| 63aa9df0 | 50 | .BR ssignal () |
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51 | defines the action to take when the software signal with |
| 52 | number | |
| 53 | .I signum | |
| 54 | is raised using the function | |
| 63aa9df0 | 55 | .BR gsignal (), |
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56 | and returns the previous such action or SIG_DFL. |
| 57 | The function | |
| 63aa9df0 | 58 | .BR gsignal () |
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59 | does the following: if no action (or the action SIG_DFL) was |
| 60 | specified for | |
| 61 | .IR signum , | |
| 62 | then it does nothing and returns 0. | |
| 63 | If the action SIG_IGN was specified for | |
| 64 | .IR signum , | |
| 65 | then it does nothing and returns 1. | |
| 66 | Otherwise, it resets the action to SIG_DFL and calls | |
| 67 | the action function with parameter | |
| 68 | .IR signum , | |
| 69 | and returns the value returned by that function. | |
| 70 | The range of possible values | |
| 71 | .I signum | |
| 72 | varies (often 1-15 or 1-17). | |
| 73 | .SH "CONFORMING TO" | |
| 68e1685c | 74 | These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64. |
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75 | They are called obsolete under most of these systems, and are |
| 76 | broken under Linux libc and glibc. | |
| 77 | Some systems also have | |
| 31e9a9ec | 78 | .BR gsignal_r () |
| fea681da | 79 | and |
| 31e9a9ec | 80 | .BR ssignal_r (). |
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81 | .SH "SEE ALSO" |
| 82 | .BR kill (2), | |
| 83 | .BR signal (2), | |
| 84 | .BR raise (3) |