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GSIGNAL, SSIGNAL - reference manual online

Software signal facility.

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2015-07-23
GSIGNAL(3)                          Linux Programmer's Manual                          GSIGNAL(3)

NAME gsignal, ssignal - software signal facility
SYNOPSIS #include <signal.h> typedef void (*sighandler_t)(int); int gsignal(int signum); sighandler_t ssignal(int signum, sighandler_t action); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): gsignal(), ssignal(): _SVID_SOURCE
DESCRIPTION Don't use these functions under Linux. Due to a historical mistake, under Linux these functions are aliases for raise(3) and signal(2), respectively. Elsewhere, on System V-like systems, these functions implement software signaling, entirely independent of the classical signal(2) and kill(2) functions. The function ssig‐ nal() defines the action to take when the software signal with number signum is raised using the function gsignal(), and returns the previous such action or SIG_DFL. The func‐ tion gsignal() does the following: if no action (or the action SIG_DFL) was specified for signum, then it does nothing and returns 0. If the action SIG_IGN was specified for signum, then it does nothing and returns 1. Otherwise, it resets the action to SIG_DFL and calls the action function with argument signum, and returns the value returned by that function. The range of possible values signum varies (often 1-15 or 1-17).
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────┬───────────────┬─────────────────┐ │Interface │ Attribute │ Value │ ├──────────┼───────────────┼─────────────────┤ │gsignal() │ Thread safety │ MT-Safe │ ├──────────┼───────────────┼─────────────────┤ │ssignal() │ Thread safety │ MT-Safe sigintr │ └──────────┴───────────────┴─────────────────┘
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 gsignal_r() and ssignal_r().
SEE ALSO kill(2), signal(2), raise(3)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
2015-07-23 GSIGNAL(3)
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gsignal(3) referred by
refer to attributes(7) | feature_test_macros(7) | kill(2) | raise(3) | signal(2)