1GSIGNAL(3) Linux Programmer's Manual GSIGNAL(3)
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6 gsignal, ssignal - software signal facility
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9 #include <signal.h>
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11 typedef void (*sighandler_t)(int);
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13 int gsignal(intsignum);
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15 sighandler_t ssignal(int signum, sighandler_t action);
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17 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19 gsignal(), ssignal(): _SVID_SOURCE
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22 Don't use these functions under Linux. Due to a historical mistake,
23 under Linux these functions are aliases for raise(3) and signal(2),
24 respectively.
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26 Elsewhere, on System V-like systems, these functions implement software
27 signaling, entirely independent of the classical signal(2) and kill(2)
28 functions. The function ssignal() defines the action to take when the
29 software signal with number signum is raised using the function gsig‐
30 nal(), and returns the previous such action or SIG_DFL. The function
31 gsignal() does the following: if no action (or the action SIG_DFL) was
32 specified for signum, then it does nothing and returns 0. If the
33 action SIG_IGN was specified for signum, then it does nothing and
34 returns 1. Otherwise, it resets the action to SIG_DFL and calls the
35 action function with argument signum, and returns the value returned by
36 that function. The range of possible values signum varies (often 1-15
37 or 1-17).
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40 These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris,
41 Tru64. They are called obsolete under most of these systems, and are
42 broken under Linux libc and glibc. Some systems also have gsignal_r()
43 and ssignal_r().
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46 kill(2), signal(2), raise(3)
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49 This page is part of release 3.22 of the Linux man-pages project. A
50 description of the project, and information about reporting bugs, can
51 be found at http://www.kernel.org/doc/man-pages/.
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55 2007-07-26 GSIGNAL(3)