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    /or1k/trunk/newlib-1.10.0/newlib/libc/signal
    from Rev 1010 to Rev 1765
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  •

Rev 1010 → Rev 1765

/Makefile.in
0,0 → 1,366
# Makefile.in generated automatically by automake 1.4 from Makefile.am
 
# Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc.
# This Makefile.in is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.
 
 
 
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INSTALL_DATA = @INSTALL_DATA@
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AUTOMAKE_OPTIONS = cygnus
 
INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
 
LIB_SOURCES = raise.c signal.c
 
libsignal_la_LDFLAGS = -Xcompiler -nostdlib
 
@USE_LIBTOOL_TRUE@noinst_LTLIBRARIES = @USE_LIBTOOL_TRUE@libsignal.la
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@USE_LIBTOOL_FALSE@noinst_LIBRARIES = @USE_LIBTOOL_FALSE@lib.a
@USE_LIBTOOL_FALSE@lib_a_SOURCES = @USE_LIBTOOL_FALSE@$(LIB_SOURCES)
 
CHEWOUT_FILES = raise.def signal.def
 
SUFFIXES = .def
 
CHEW = ../../doc/makedoc -f $(srcdir)/../../doc/doc.str
 
TARGETDOC = ../tmp.texi
 
CLEANFILES = $(CHEWOUT_FILES) *.ref
mkinstalldirs = $(SHELL) $(top_srcdir)/../../mkinstalldirs
CONFIG_CLEAN_FILES =
LIBRARIES = $(noinst_LIBRARIES)
 
 
DEFS = @DEFS@ -I. -I$(srcdir)
CPPFLAGS = @CPPFLAGS@
LIBS = @LIBS@
lib_a_LIBADD =
@USE_LIBTOOL_FALSE@lib_a_OBJECTS = raise.o signal.o
LTLIBRARIES = $(noinst_LTLIBRARIES)
 
libsignal_la_LIBADD =
@USE_LIBTOOL_TRUE@libsignal_la_OBJECTS = raise.lo signal.lo
CFLAGS = @CFLAGS@
COMPILE = $(CC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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CCLD = $(CC)
LINK = $(LIBTOOL) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@
DATA = $(noinst_DATA)
 
DIST_COMMON = Makefile.am Makefile.in
 
 
DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST)
 
TAR = gtar
GZIP_ENV = --best
SOURCES = $(lib_a_SOURCES) $(libsignal_la_SOURCES)
OBJECTS = $(lib_a_OBJECTS) $(libsignal_la_OBJECTS)
 
all: all-redirect
.SUFFIXES:
.SUFFIXES: .S .c .def .lo .o .s
$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ Makefile.am $(top_srcdir)/configure.in $(ACLOCAL_M4) $(srcdir)/../../Makefile.shared
cd $(top_srcdir) && $(AUTOMAKE) --cygnus signal/Makefile
 
Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
cd $(top_builddir) \
&& CONFIG_FILES=$(subdir)/$@ CONFIG_HEADERS= $(SHELL) ./config.status
 
 
mostlyclean-noinstLIBRARIES:
 
clean-noinstLIBRARIES:
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distclean-noinstLIBRARIES:
 
maintainer-clean-noinstLIBRARIES:
 
.c.o:
$(COMPILE) -c $<
 
.s.o:
$(COMPILE) -c $<
 
.S.o:
$(COMPILE) -c $<
 
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distclean-compile:
-rm -f *.tab.c
 
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$(LIBTOOL) --mode=compile $(COMPILE) -c $<
 
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$(LIBTOOL) --mode=compile $(COMPILE) -c $<
 
.S.lo:
$(LIBTOOL) --mode=compile $(COMPILE) -c $<
 
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-rm -f *.lo
 
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-rm -rf .libs _libs
 
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maintainer-clean-libtool:
 
lib.a: $(lib_a_OBJECTS) $(lib_a_DEPENDENCIES)
-rm -f lib.a
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distclean-noinstLTLIBRARIES:
 
maintainer-clean-noinstLTLIBRARIES:
 
libsignal.la: $(libsignal_la_OBJECTS) $(libsignal_la_DEPENDENCIES)
$(LINK) $(libsignal_la_LDFLAGS) $(libsignal_la_OBJECTS) $(libsignal_la_LIBADD) $(LIBS)
 
tags: TAGS
 
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subdir = signal
 
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mostlyclean-generic:
 
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objectlist.awk.in: $(noinst_LTLIBRARIES)
-rm -f objectlist.awk.in
for i in `ls *.lo` ; \
do \
echo $$i `pwd`/$$i >> objectlist.awk.in ; \
done
 
.c.def:
$(CHEW) < $< > $*.def 2> $*.ref
touch stmp-def
 
doc: $(CHEWOUT_FILES)
cat $(srcdir)/signal.tex >> $(TARGETDOC)
 
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:
/raise.c
0,0 → 1,80
/* Embedded systems may want the simulated signals if no other form exists,
but UNIX versions will want to use the host facilities.
Define SIMULATED_SIGNALS when you want to use the simulated versions.
*/
 
/*
FUNCTION
<<raise>>---send a signal
 
INDEX
raise
INDEX
_raise_r
 
ANSI_SYNOPSIS
#include <signal.h>
int raise(int <[sig]>);
 
int _raise_r(void *<[reent]>, int <[sig]>);
 
TRAD_SYNOPSIS
#include <signal.h>
int raise(<[sig]>)
int <[sig]>;
 
int _raise_r(<[reent]>, <[sig]>)
char *<[reent]>;
int <[sig]>;
 
DESCRIPTION
Send the signal <[sig]> (one of the macros from `<<sys/signal.h>>').
This interrupts your program's normal flow of execution, and allows a signal
handler (if you've defined one, using <<signal>>) to take control.
 
The alternate function <<_raise_r>> is a reentrant version. The extra
argument <[reent]> is a pointer to a reentrancy structure.
 
RETURNS
The result is <<0>> if <[sig]> was successfully raised, <<1>>
otherwise. However, the return value (since it depends on the normal
flow of execution) may not be visible, unless the signal handler for
<[sig]> terminates with a <<return>> or unless <<SIG_IGN>> is in
effect for this signal.
 
PORTABILITY
ANSI C requires <<raise>>, but allows the full set of signal numbers
to vary from one implementation to another.
 
Required OS subroutines: <<getpid>>, <<kill>>.
*/
 
#ifndef SIGNAL_PROVIDED
 
int _dummy_raise;
 
#else
 
#include <reent.h>
#include <signal.h>
 
#ifndef _REENT_ONLY
 
int
_DEFUN (raise, (sig),
int sig)
{
return _raise_r (_REENT, sig);
}
 
#endif
 
int
_DEFUN (_raise_r, (reent, sig),
struct _reent *reent _AND
int sig)
{
return _kill_r (reent, _getpid_r (reent), sig);
}
 
#endif /* SIGNAL_PROVIDED */
/Makefile.am
0,0 → 1,38
## Process this file with automake to generate Makefile.in
 
AUTOMAKE_OPTIONS = cygnus
 
INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
 
LIB_SOURCES = raise.c signal.c
 
libsignal_la_LDFLAGS = -Xcompiler -nostdlib
 
if USE_LIBTOOL
noinst_LTLIBRARIES = libsignal.la
libsignal_la_SOURCES = $(LIB_SOURCES)
noinst_DATA = objectlist.awk.in
else
noinst_LIBRARIES = lib.a
lib_a_SOURCES = $(LIB_SOURCES)
noinst_DATA =
endif # USE_LIBTOOL
 
include $(srcdir)/../../Makefile.shared
 
CHEWOUT_FILES = raise.def signal.def
 
SUFFIXES = .def
 
CHEW = ../../doc/makedoc -f $(srcdir)/../../doc/doc.str
 
.c.def:
$(CHEW) < $< > $*.def 2> $*.ref
touch stmp-def
 
TARGETDOC = ../tmp.texi
 
doc: $(CHEWOUT_FILES)
cat $(srcdir)/signal.tex >> $(TARGETDOC)
 
CLEANFILES = $(CHEWOUT_FILES) *.ref
/signal.tex
0,0 → 1,70
@node Signals
@chapter Signal Handling (@file{signal.h})
 
A @dfn{signal} is an event that interrupts the normal flow of control
in your program. Your operating environment normally defines the full
set of signals available (see @file{sys/signal.h}), as well as the
default means of dealing with them---typically, either printing an
error message and aborting your program, or ignoring the signal.
 
All systems support at least the following signals:
@table @code
@item SIGABRT
Abnormal termination of a program; raised by the <<abort>> function.
 
@item SIGFPE
A domain error in arithmetic, such as overflow, or division by zero.
 
@item SIGILL
Attempt to execute as a function data that is not executable.
 
@item SIGINT
Interrupt; an interactive attention signal.
 
@item SIGSEGV
An attempt to access a memory location that is not available.
 
@item SIGTERM
A request that your program end execution.
@end table
 
Two functions are available for dealing with asynchronous
signals---one to allow your program to send signals to itself (this is
called @dfn{raising} a signal), and one to specify subroutines (called
@dfn{handlers} to handle particular signals that you anticipate may
occur---whether raised by your own program or the operating environment.
 
To support these functions, @file{signal.h} defines three macros:
 
@table @code
@item SIG_DFL
Used with the @code{signal} function in place of a pointer to a
handler subroutine, to select the operating environment's default
handling of a signal.
 
@item SIG_IGN
Used with the @code{signal} function in place of a pointer to a
handler, to ignore a particular signal.
 
@item SIG_ERR
Returned by the @code{signal} function in place of a pointer to a
handler, to indicate that your request to set up a handler could not
be honored for some reason.
@end table
 
@file{signal.h} also defines an integral type, @code{sig_atomic_t}.
This type is not used in any function declarations; it exists only to
allow your signal handlers to declare a static storage location where
they may store a signal value. (Static storage is not otherwise
reliable from signal handlers.)
 
@menu
* raise:: Send a signal
* signal:: Specify handler subroutine for a signal
@end menu
 
@page
@include signal/raise.def
 
@page
@include signal/signal.def
/signal.c
0,0 → 1,259
/*
FUNCTION
<<signal>>---specify handler subroutine for a signal
 
INDEX
signal
INDEX
_signal_r
INDEX
raise
INDEX
_raise_r
 
ANSI_SYNOPSIS
#include <signal.h>
void ( * signal(int <[sig]>, void(*<[func]>)(int)) )(int);
 
void ( * _signal_r(void *<[reent]>,
int <[sig]>, void(*<[func]>)(int)) )(int);
 
int raise (int <[sig]>);
 
int _raise_r (void *<[reent]>, int <[sig]>);
 
TRAD_SYNOPSIS
#include <signal.h>
char ( * signal(<[sig]>, <[func]>) )()
int <[sig]>;
char ( * <[func]> )();
 
char ( * _signal_r(<[reent]>, <[sig]>, <[func]>) )()
char *<[reent]>;
int <[sig]>;
char ( * <[func]> )();
 
int raise (<[sig]>)()
int <[sig]>;
 
int _raise_r (<[reent]>, <[sig]>)()
char *<[reent]>;
int <[sig]>;
 
DESCRIPTION
<<signal, raise>> provide a simple signal/raise implementation for embedded
targets.
 
<<signal>> allows you to request changed treatment for a particular
signal <[sig]>. You can use one of the predefined macros <<SIG_DFL>>
(select system default handling) or <<SIG_IGN>> (ignore this signal)
as the value of <[func]>; otherwise, <[func]> is a function pointer
that identifies a subroutine in your program as the handler for this signal.
 
Some of the execution environment for signal handlers is
unpredictable; notably, the only library function required to work
correctly from within a signal handler is @code{signal} itself, and
only when used to redefine the handler for the current signal value.
 
Static storage is likewise unreliable for signal handlers, with one
exception: if you declare a static storage location as `<<volatile
sig_atomic_t>>', then you may use that location in a signal handler to
store signal values.
 
If your signal handler terminates using <<return>> (or implicit
return), your program's execution continues at the point
where it was when the signal was raised (whether by your program
itself, or by an external event). Signal handlers can also
use functions such as <<exit>> and <<abort>> to avoid returning.
 
<<raise>> sends the signal sig to the executing program. It returns zero if
successful, non-zero if unsuccessful.
 
The alternate functions <<_signal_r, _raise_r>> are the reentrant versions.
The extra argument <[reent]> is a pointer to a reentrancy structure.
 
 
@c FIXME: do we have setjmp.h and assoc fns?
 
RETURNS
If your request for a signal handler cannot be honored, the result is
<<SIG_ERR>>; a specific error number is also recorded in <<errno>>.
 
Otherwise, the result is the previous handler (a function pointer or
one of the predefined macros).
 
PORTABILITY
ANSI C requires <<raise>>, <<signal>>.
 
No supporting OS subroutines are required to link with <<signal>>, but
it will not have any useful effects, except for software generated signals,
without an operating system that can actually raise exceptions.
*/
 
/*
* signal.c
* Original Author: G. Haley
*
* signal associates the function pointed to by func with the signal sig. When
* a signal occurs, the value of func determines the action taken as follows:
* if func is SIG_DFL, the default handling for that signal will occur; if func
* is SIG_IGN, the signal will be ignored; otherwise, the default handling for
* the signal is restored (SIG_DFL), and the function func is called with sig
* as its argument. Returns the value of func for the previous call to signal
* for the signal sig, or SIG_ERR if the request fails.
*/
 
/* _init_signal initialises the signal handlers for each signal. This function
is called by crt0 at program startup. */
 
#ifdef SIGNAL_PROVIDED
 
int _dummy_simulated_signal;
 
#else
 
#include <errno.h>
#include <signal.h>
#include <stddef.h>
#include <stdlib.h>
#include <reent.h>
#include <_syslist.h>
 
int
_DEFUN (_init_signal_r, (ptr),
struct _reent *ptr)
{
int i;
 
if (ptr->_sig_func == NULL)
{
ptr->_sig_func = (_sig_func_ptr *)_malloc_r (ptr, sizeof (_sig_func_ptr) * NSIG);
if (ptr->_sig_func == NULL)
return -1;
 
for (i = 0; i < NSIG; i++)
ptr->_sig_func[i] = SIG_DFL;
}
 
return 0;
}
 
_sig_func_ptr
_DEFUN (_signal_r, (ptr, sig, func),
struct _reent *ptr _AND
int sig _AND
_sig_func_ptr func)
{
_sig_func_ptr old_func;
 
if (sig < 0 || sig >= NSIG)
{
ptr->_errno = EINVAL;
return SIG_ERR;
}
 
if (ptr->_sig_func == NULL && _init_signal_r (ptr) != 0)
return SIG_ERR;
old_func = ptr->_sig_func[sig];
ptr->_sig_func[sig] = func;
 
return old_func;
}
 
int
_raise_r (ptr, sig)
struct _reent *ptr;
int sig;
{
_sig_func_ptr func;
 
if (sig < 0 || sig >= NSIG)
{
ptr->_errno = EINVAL;
return -1;
}
 
if (ptr->_sig_func == NULL && _init_signal_r (ptr) != 0)
return -1;
func = ptr->_sig_func[sig];
if (func == SIG_DFL)
return _kill_r (ptr, _getpid_r (ptr), sig);
else if (func == SIG_IGN)
return 0;
else if (func == SIG_ERR)
{
ptr->_errno = EINVAL;
return 1;
}
else
{
ptr->_sig_func[sig] = SIG_DFL;
func (sig);
return 0;
}
}
 
int
__sigtramp_r (ptr, sig)
struct _reent *ptr;
int sig;
{
_sig_func_ptr func;
 
if (sig < 0 || sig >= NSIG)
{
return -1;
}
 
if (ptr->_sig_func == NULL && _init_signal_r (ptr) != 0)
return -1;
 
func = ptr->_sig_func[sig];
if (func == SIG_DFL)
return 1;
else if (func == SIG_ERR)
return 2;
else if (func == SIG_IGN)
return 3;
else
{
ptr->_sig_func[sig] = SIG_DFL;
func (sig);
return 0;
}
}
 
#ifndef _REENT_ONLY
 
int
raise (sig)
int sig;
{
return _raise_r (_REENT, sig);
}
 
_sig_func_ptr
_DEFUN (signal, (sig, func),
int sig _AND
_sig_func_ptr func)
{
return _signal_r (_REENT, sig, func);
}
 
int
_init_signal ()
{
return _init_signal_r (_REENT);
}
 
int
__sigtramp (int sig)
{
return __sigtramp_r (_REENT, sig);
}
 
#endif
 
#endif /* !SIGNAL_PROVIDED */

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