GENWiki

Premier IT Outsourcing and Support Services within the UK

User Tools

Site Tools


man:ssignal

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():
         Since glibc 2.19:
             _DEFAULT_SOURCE
         Glibc 2.19 and earlier:
             _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 ssignal() defines the action to take when the
     software signal with number signum is raised using the  function  gsig-
     nal(),  and  returns the previous such action or SIG_DFL.  The function
     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).
     allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value  T{ gsignal()
     T}   Thread safety     MT-Safe T{ ssignal() T}   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 4.16 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
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                        GSIGNAL(3)
/data/webs/external/dokuwiki/data/pages/man/ssignal.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

Was this page helpful?-10+1

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki