программное средство сигнализации (software signal facility)
Имя (Name)
gsignal, ssignal - software signal facility
Синопсис (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
Описание (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 gsignal(), 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).
Атрибуты (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 │
└──────────────────────────────┴───────────────┴─────────────────┘
Стандарты (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 glibc. Some systems also have
gsignal_r() and ssignal_r().
Смотри также (See also)
kill(2), signal(2), raise(3)
