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   bsd_signal    ( 3 )

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Имя (Name)

bsd_signal - signal handling with BSD semantics

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Синопсис (Synopsis)

#include <signal.h>

       typedef void (*sighandler_t)(int);

       sighandler_t bsd_signal(int signum, sighandler_t handler);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       bsd_signal():
           Since glibc 2.26:
               _XOPEN_SOURCE >= 500
                   && ! (_POSIX_C_SOURCE >= 200809L)
           Glibc 2.25 and earlier:
               _XOPEN_SOURCE

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Описание (Description)

The bsd_signal() function takes the same arguments, and performs
       the same task, as signal(2).

       The difference between the two is that bsd_signal() is guaranteed
       to provide reliable signal semantics, that is: a) the disposition
       of the signal is not reset to the default when the handler is
       invoked; b) delivery of further instances of the signal is
       blocked while the signal handler is executing; and c) if the
       handler interrupts a blocking system call, then the system call
       is automatically restarted.  A portable application cannot rely
       on signal(2) to provide these guarantees.

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Возвращаемое значение (Return value)

The bsd_signal() function returns the previous value of the
       signal handler, or SIG_ERR on error.

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Ошибки (Error)

As for signal(2).

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Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │bsd_signal()                          │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

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Стандарты (Conforming to)

4.2BSD, POSIX.1-2001.  POSIX.1-2008 removes the specification of
       bsd_signal(), recommending the use of sigaction(2) instead.

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Примечание (Note)

Use of bsd_signal() should be avoided; use sigaction(2) instead.

       On modern Linux systems, bsd_signal() and signal(2) are
       equivalent.  But on older systems, signal(2) provided unreliable
       signal semantics; see signal(2) for details.

       The use of sighandler_t is a GNU extension; this type is defined
       only if the _GNU_SOURCE feature test macro is defined.

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Смотри также (See also)

sigaction(2), signal(2), sysv_signal(3), signal(7)

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