| .\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl> |
| .\" |
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| .\" This replaces an earlier man page written by Walter Harms |
| .\" <walter.harms@informatik.uni-oldenburg.de>. |
| .TH GSIGNAL 3 2017-09-15 "" "Linux Programmer's Manual" |
| .SH NAME |
| gsignal, ssignal \- software signal facility |
| .SH SYNOPSIS |
| .nf |
| .B #include <signal.h> |
| .PP |
| .B typedef void (*sighandler_t)(int); |
| .PP |
| .BI "int gsignal(int " signum ); |
| .PP |
| .BI "sighandler_t ssignal(int " signum ", sighandler_t " action ); |
| .fi |
| .PP |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .PP |
| .BR gsignal (), |
| .BR ssignal (): |
| Since glibc 2.19: |
| _DEFAULT_SOURCE |
| Glibc 2.19 and earlier: |
| _SVID_SOURCE |
| .SH DESCRIPTION |
| Don't use these functions under Linux. |
| Due to a historical mistake, under Linux these functions are |
| aliases for |
| .BR raise (3) |
| and |
| .BR signal (2), |
| respectively. |
| .PP |
| Elsewhere, on System V-like systems, these functions implement |
| software signaling, entirely independent of the classical |
| .BR signal (2) |
| and |
| .BR kill (2) |
| functions. |
| The function |
| .BR ssignal () |
| defines the action to take when the software signal with |
| number |
| .I signum |
| is raised using the function |
| .BR gsignal (), |
| and returns the previous such action or |
| .BR SIG_DFL . |
| The function |
| .BR gsignal () |
| does the following: if no action (or the action |
| .BR SIG_DFL ) |
| was |
| specified for |
| .IR signum , |
| then it does nothing and returns 0. |
| If the action |
| .B SIG_IGN |
| was specified for |
| .IR signum , |
| then it does nothing and returns 1. |
| Otherwise, it resets the action to |
| .B SIG_DFL |
| and calls |
| the action function with argument |
| .IR signum , |
| and returns the value returned by that function. |
| The range of possible values |
| .I signum |
| varies (often 1\(en15 or 1\(en17). |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR gsignal () |
| T} Thread safety MT-Safe |
| T{ |
| .BR ssignal () |
| T} Thread safety MT-Safe sigintr |
| .TE |
| .sp 1 |
| .SH CONFORMING TO |
| These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64. |
| They are called obsolete under most of these systems, and are |
| broken under Linux libc and glibc. |
| Some systems also have |
| .BR gsignal_r () |
| and |
| .BR ssignal_r (). |
| .SH SEE ALSO |
| .BR kill (2), |
| .BR signal (2), |
| .BR raise (3) |