mirror of https://github.com/acidanthera/audk.git
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
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/** @file
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Implementation of the signal and raise functions as declared in <signal.h>.
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Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Library/UefiLib.h>
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#include <LibConfig.h>
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#include <errno.h>
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#include <signal.h>
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#include <MainData.h>
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/** The signal function associates a "signal handler" with a signal number.
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The signal function chooses one of three ways in which receipt of the
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signal number, sig, is to be subsequently handled. If the value of func
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is SIG_DFL, default handling for that signal will occur. If the value of
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func is SIG_IGN, the signal will be ignored. Otherwise, func shall point
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to a function to be called when that signal occurs. An invocation of such a
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function because of a signal, or (recursively) of any further functions
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called by that invocation (other than functions in the standard library),
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is called a signal handler.
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At program startup, the equivalent of signal(sig, SIG_IGN); may be executed
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for some signals selected in an implementation-defined manner; the
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equivalent of signal(sig, SIG_DFL); is executed for all other signals
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defined by the implementation.
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@return If the request can be honored, the signal function returns the
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value of func for the most recent successful call to signal for
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the specified signal sig. Otherwise, a value of SIG_ERR is
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returned and a positive value is stored in errno.
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*/
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__sighandler_t *
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signal(int sig, __sighandler_t *func)
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{
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__sighandler_t *OldHandler;
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if (sig < 0 || sig >= SIG_LAST) {
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errno = EINVAL;
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return SIG_ERR;
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}
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OldHandler = gMD->sigarray[sig];
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gMD->sigarray[sig] = func;
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return OldHandler;
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}
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static
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void
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_defaultSignalHandler( int sig )
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{
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Print(L"\nCaught signal %d.\n", sig);
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}
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/** Send a signal.
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The raise function carries out the actions described for signal, above,
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for the signal sig.
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If a signal handler is called, the raise function shall not return until
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after the signal handler does.
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@return The raise function returns zero if successful,
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nonzero if unsuccessful.
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**/
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int
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raise( int sig)
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{
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__sighandler_t *Handler;
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if (sig < 0 || sig >= SIG_LAST) {
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return EINVAL;
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}
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Handler = gMD->sigarray[sig];
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if(Handler == SIG_DFL) {
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_defaultSignalHandler( sig );
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}
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else if( Handler != SIG_IGN) {
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Handler( sig );
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}
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return 0;
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}
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