mirror of https://github.com/acidanthera/audk.git
84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
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/** @file
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The header <signal.h> declares a type and two functions and defines several
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macros, for handling various signals (conditions that may be reported during
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program execution).
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The UEFI implementation of <signal.h> maps signals onto the UEFI
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event mechanism.
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An implementation need not generate any of these signals, except as a result
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of explicit calls to the raise function. Additional signals and pointers to
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undeclarable functions, with macro definitions beginning, respectively, with
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the letters SIG and an uppercase letter or with SIG_ and an uppercase letter
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may also be specified by the implementation. The complete set of signals,
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their semantics, and their default handling is implementation-defined; all
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signal numbers shall be positive.
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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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#ifndef _SIGNAL_H
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#define _SIGNAL_H
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#include <sys/EfiCdefs.h>
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#include <sys/signal.h>
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/* The type sig_atomic_t is the (possibly volatile-qualified) integer type of
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an object that can be accessed as an atomic entity, even in the presence
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of asynchronous interrupts.
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This, possibly machine specific, type is defined in <machine/signal.h>.
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*/
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/** The following three macros expand to constant expressions with distinct
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values that have type compatible with the second argument to, and the
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return value of, the signal function, and whose values compare unequal to
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the address of any declarable function.
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**/
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#define SIG_IGN ((__sighandler_t *) 0)
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#define SIG_DFL ((__sighandler_t *) 1)
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#define SIG_ERR ((__sighandler_t *) 3)
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/** The following members expand to positive integer constant expressions with
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type int and distinct values that are the signal numbers, each
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corresponding to the specified condition.
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Many existing programs expect these to be macros.
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**/
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#define SIGINT 1 ///< receipt of an interactive attention signal
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#define SIGILL 2 ///< detection of an invalid function image, such as an invalid instruction
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#define SIGABRT 3 ///< abnormal termination, such as is initiated by the abort function
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#define SIGFPE 4 ///< an erroneous arithmetic operation, such as zero divide or an operation resulting in overflow
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#define SIGSEGV 5 ///< an invalid access to storage
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#define SIGTERM 6 ///< a termination request sent to the program
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#define SIG_LAST 7 ///< One more than the largest signal number
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__BEGIN_DECLS
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/* For historical reasons; programs expect signal to be declared
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in <sys/signal.h>. The function is documented in <sys/signal.h>.
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The function is declared in the C Standard as:<BR>
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void (*signal(int sig, void (*func)(int)))(int);
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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,
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in <sys/signal.h>, for the signal sig. If a signal handler is called, the
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raise function shall not return until 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 raise(int sig);
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__END_DECLS
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#endif /* _SIGNAL_H */
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