Factor out shared definitions from bits/signum.h.
Many of the things defined by bits/signum.h are invariant across all
supported operating systems. This patch factors out all of them to a
new header bits/signum-generic.h, which each bits/signum.h will include
and then override whichever things need adjustment. Normally that will
mean, at most, adding or changing a few signal numbers.
A user-visible side effect is that the obsolete signal constant SIGUNUSED
(which is an alias for SIGSYS on all platforms that define it) is no
longer exposed by any version of bits/signum.h.
A side effect only relevant to glibc hackers is that _NSIG is now defined
in terms of __SIGRTMAX, instead of the other way around. This is because
__SIGRTMAX varies from platform to platform, but _NSIG==__SIGRTMAX+1 is
true universally. If your platform doesn't support realtime signals,
leave __SIGRTMAX equal to __SIGRTMIN.
I also added a Linux-specific test to make sure that our signal constants
match the ones in <asm/signal.h>, since we can't use that header (it's
not even vaguely namespace-clean).
* bits/signum-generic.h: Renamed from bits/signum.h.
Add proper multiple include guard and misuse check.
Define __SIGRTMIN = __SIGRTMAX = 32, and define _NSIG = __SIGRTMAX+1.
Move definition of SIGIO to "archaic names for compatibility" section.
* bits/signum.h: New file which just includes bits/signum-generic.h.
* sysdeps/unix/bsd/bits/signum.h
* sysdeps/unix/sysv/linux/bits/signum.h
* sysdeps/unix/sysv/linux/alpha/bits/signum.h
* sysdeps/unix/sysv/linux/hppa/bits/signum.h
* sysdeps/unix/sysv/linux/mips/bits/signum.h
* sysdeps/unix/sysv/linux/sparc/bits/signum.h
Just include <bits/signum-generic.h> and then add or adjust
signal constants. Do not define SIGUNUSED, SIGRTMIN, or SIGRTMAX.
* signal/Makefile: Install bits/signum-generic.h.
* signal/signal.h: Define SIGRTMIN and SIGRTMAX here.
* sysdeps/generic/siglist.h: SIGSYS and SIGWINCH are
universal. Prefer SIGPOLL to SIGIO. Simplify #ifdeffage.
* sysdeps/unix/sysv/linux/tst-signal-numbers.sh: New test.
* sysdeps/unix/sysv/linux/Makefile: Run it.
2017-06-04 04:22:24 +08:00
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/* Signal number constants. Generic template.
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2018-01-01 08:32:25 +08:00
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Copyright (C) 1991-2018 Free Software Foundation, Inc.
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Factor out shared definitions from bits/signum.h.
Many of the things defined by bits/signum.h are invariant across all
supported operating systems. This patch factors out all of them to a
new header bits/signum-generic.h, which each bits/signum.h will include
and then override whichever things need adjustment. Normally that will
mean, at most, adding or changing a few signal numbers.
A user-visible side effect is that the obsolete signal constant SIGUNUSED
(which is an alias for SIGSYS on all platforms that define it) is no
longer exposed by any version of bits/signum.h.
A side effect only relevant to glibc hackers is that _NSIG is now defined
in terms of __SIGRTMAX, instead of the other way around. This is because
__SIGRTMAX varies from platform to platform, but _NSIG==__SIGRTMAX+1 is
true universally. If your platform doesn't support realtime signals,
leave __SIGRTMAX equal to __SIGRTMIN.
I also added a Linux-specific test to make sure that our signal constants
match the ones in <asm/signal.h>, since we can't use that header (it's
not even vaguely namespace-clean).
* bits/signum-generic.h: Renamed from bits/signum.h.
Add proper multiple include guard and misuse check.
Define __SIGRTMIN = __SIGRTMAX = 32, and define _NSIG = __SIGRTMAX+1.
Move definition of SIGIO to "archaic names for compatibility" section.
* bits/signum.h: New file which just includes bits/signum-generic.h.
* sysdeps/unix/bsd/bits/signum.h
* sysdeps/unix/sysv/linux/bits/signum.h
* sysdeps/unix/sysv/linux/alpha/bits/signum.h
* sysdeps/unix/sysv/linux/hppa/bits/signum.h
* sysdeps/unix/sysv/linux/mips/bits/signum.h
* sysdeps/unix/sysv/linux/sparc/bits/signum.h
Just include <bits/signum-generic.h> and then add or adjust
signal constants. Do not define SIGUNUSED, SIGRTMIN, or SIGRTMAX.
* signal/Makefile: Install bits/signum-generic.h.
* signal/signal.h: Define SIGRTMIN and SIGRTMAX here.
* sysdeps/generic/siglist.h: SIGSYS and SIGWINCH are
universal. Prefer SIGPOLL to SIGIO. Simplify #ifdeffage.
* sysdeps/unix/sysv/linux/tst-signal-numbers.sh: New test.
* sysdeps/unix/sysv/linux/Makefile: Run it.
2017-06-04 04:22:24 +08:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _BITS_SIGNUM_GENERIC_H
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#define _BITS_SIGNUM_GENERIC_H 1
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#ifndef _SIGNAL_H
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#error "Never include <bits/signum-generic.h> directly; use <signal.h> instead."
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#endif
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/* Fake signal functions. */
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#define SIG_ERR ((__sighandler_t) -1) /* Error return. */
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#define SIG_DFL ((__sighandler_t) 0) /* Default action. */
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#define SIG_IGN ((__sighandler_t) 1) /* Ignore signal. */
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#ifdef __USE_XOPEN
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# define SIG_HOLD ((__sighandler_t) 2) /* Add signal to hold mask. */
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#endif
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/* We define here all the signal names listed in POSIX (1003.1-2008);
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as of 1003.1-2013, no additional signals have been added by POSIX.
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We also define here signal names that historically exist in every
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real-world POSIX variant (e.g. SIGWINCH).
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Signals in the 1-15 range are defined with their historical numbers.
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For other signals, we use the BSD numbers.
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There are two unallocated signal numbers in the 1-31 range: 7 and 29.
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Signal number 0 is reserved for use as kill(pid, 0), to test whether
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a process exists without sending it a signal. */
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/* ISO C99 signals. */
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#define SIGINT 2 /* Interactive attention signal. */
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#define SIGILL 4 /* Illegal instruction. */
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#define SIGABRT 6 /* Abnormal termination. */
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#define SIGFPE 8 /* Erroneous arithmetic operation. */
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#define SIGSEGV 11 /* Invalid access to storage. */
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#define SIGTERM 15 /* Termination request. */
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/* Historical signals specified by POSIX. */
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#define SIGHUP 1 /* Hangup. */
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#define SIGQUIT 3 /* Quit. */
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#define SIGTRAP 5 /* Trace/breakpoint trap. */
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#define SIGKILL 9 /* Killed. */
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#define SIGBUS 10 /* Bus error. */
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#define SIGSYS 12 /* Bad system call. */
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#define SIGPIPE 13 /* Broken pipe. */
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#define SIGALRM 14 /* Alarm clock. */
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/* New(er) POSIX signals (1003.1-2008, 1003.1-2013). */
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#define SIGURG 16 /* Urgent data is available at a socket. */
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#define SIGSTOP 17 /* Stop, unblockable. */
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#define SIGTSTP 18 /* Keyboard stop. */
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#define SIGCONT 19 /* Continue. */
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#define SIGCHLD 20 /* Child terminated or stopped. */
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#define SIGTTIN 21 /* Background read from control terminal. */
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#define SIGTTOU 22 /* Background write to control terminal. */
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#define SIGPOLL 23 /* Pollable event occurred (System V). */
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#define SIGXCPU 24 /* CPU time limit exceeded. */
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#define SIGXFSZ 25 /* File size limit exceeded. */
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#define SIGVTALRM 26 /* Virtual timer expired. */
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#define SIGPROF 27 /* Profiling timer expired. */
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#define SIGUSR1 30 /* User-defined signal 1. */
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#define SIGUSR2 31 /* User-defined signal 2. */
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/* Nonstandard signals found in all modern POSIX systems
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(including both BSD and Linux). */
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#define SIGWINCH 28 /* Window size change (4.3 BSD, Sun). */
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/* Archaic names for compatibility. */
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#define SIGIO SIGPOLL /* I/O now possible (4.2 BSD). */
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#define SIGIOT SIGABRT /* IOT instruction, abort() on a PDP-11. */
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#define SIGCLD SIGCHLD /* Old System V name */
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/* Not all systems support real-time signals. bits/signum.h indicates
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that they are supported by overriding __SIGRTMAX to a value greater
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than __SIGRTMIN. These constants give the kernel-level hard limits,
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but some real-time signals may be used internally by glibc. Do not
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use these constants in application code; use SIGRTMIN and SIGRTMAX
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(defined in signal.h) instead. */
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#define __SIGRTMIN 32
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#define __SIGRTMAX __SIGRTMIN
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/* Biggest signal number + 1 (including real-time signals). */
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#define _NSIG (__SIGRTMAX + 1)
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#endif /* bits/signum-generic.h. */
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