mirror of https://github.com/mkerrisk/man-pages
signal.7: Unify signal lists into a signal table that embeds standards info
Having the signals listed in three different tables reduces readability, and would require more table splits if future standards specify other signals. Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk
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117
man7/signal.7
117
man7/signal.7
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@ -55,7 +55,7 @@ Each signal has a current
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which determines how the process behaves when it is delivered
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the signal.
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.PP
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The entries in the "Action" column of the tables below specify
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The entries in the "Action" column of the table below specify
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the default disposition for each signal, as follows:
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.IP Term
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Default action is to terminate the process.
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@ -221,41 +221,59 @@ the pending signal set is preserved across an
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.BR execve (2).
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.SS Standard signals
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Linux supports the standard signals listed below.
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Several signal numbers
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are architecture-dependent, as indicated in the "Value" column.
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Where four values are given,
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the first one is valid for x86, arm, and most other architectures,
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the second one for alpha and sparc,
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the third one for mips, and the last one for parisc.
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A dash (\-) denotes that a signal is absent on the corresponding architecture.
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.PP
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First the signals described in the original POSIX.1-1990 standard.
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The second column of the table indicates which standard (if any)
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specified the signal: "P1990" indicates that the signal is described
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in the original POSIX.1-1990 standard;
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"P2001" indicates that the signal was added in SUSv2 and POSIX.1-2001.
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.TS
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l c c l
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____
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lB c c l.
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Signal Standard Action Comment
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SIGABRT P1990 Core Abort signal from \fBabort\fP(3)
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SIGALRM P1990 Term Timer signal from \fBalarm\fP(2)
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SIGBUS P2001 Core Bus error (bad memory access)
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SIGCHLD P1990 Ign Child stopped or terminated
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SIGCLD \- Ign A synonym for \fBSIGCHLD\fP
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SIGCONT P1990 Cont Continue if stopped
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SIGEMT \- Term Emulator trap
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SIGFPE P1990 Core Floating-point exception
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SIGHUP P1990 Term Hangup detected on controlling terminal
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or death of controlling process
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SIGINT P1990 Term Interrupt from keyboard
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SIGQUIT P1990 Core Quit from keyboard
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SIGILL P1990 Core Illegal Instruction
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SIGABRT P1990 Core Abort signal from \fBabort\fP(3)
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SIGFPE P1990 Core Floating-point exception
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SIGINFO \- A synonym for \fBSIGPWR\fP
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SIGINT P1990 Term Interrupt from keyboard
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SIGIO \- Term I/O now possible (4.2BSD)
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SIGIOT \- Core IOT trap. A synonym for \fBSIGABRT\fP
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SIGKILL P1990 Term Kill signal
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SIGSEGV P1990 Core Invalid memory reference
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SIGLOST \- Term File lock lost (unused)
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SIGPIPE P1990 Term Broken pipe: write to pipe with no
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readers; see \fBpipe\fP(7)
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SIGALRM P1990 Term Timer signal from \fBalarm\fP(2)
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SIGTERM P1990 Term Termination signal
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SIGUSR1 P1990 Term User-defined signal 1
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SIGUSR2 P1990 Term User-defined signal 2
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SIGCHLD P1990 Ign Child stopped or terminated
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SIGCONT P1990 Cont Continue if stopped
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SIGPOLL P2001 Term Pollable event (Sys V).
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Synonym for \fBSIGIO\fP
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SIGPROF P2001 Term Profiling timer expired
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SIGPWR \- Term Power failure (System V)
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SIGQUIT P1990 Core Quit from keyboard
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SIGSEGV P1990 Core Invalid memory reference
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SIGSTKFLT \- Term Stack fault on coprocessor (unused)
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SIGSTOP P1990 Stop Stop process
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SIGTSTP P1990 Stop Stop typed at terminal
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SIGSYS P2001 Core Bad system call (SVr4);
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see also \fBseccomp\fP(2)
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SIGTERM P1990 Term Termination signal
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SIGTRAP P2001 Core Trace/breakpoint trap
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SIGTTIN P1990 Stop Terminal input for background process
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SIGTTOU P1990 Stop Terminal output for background process
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SIGUNUSED \- Core Synonymous with \fBSIGSYS\fP
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SIGURG P2001 Ign Urgent condition on socket (4.2BSD)
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SIGUSR1 P1990 Term User-defined signal 1
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SIGUSR2 P1990 Term User-defined signal 2
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SIGVTALRM P2001 Term Virtual alarm clock (4.2BSD)
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SIGXCPU P2001 Core CPU time limit exceeded (4.2BSD);
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see \fBsetrlimit\fP(2)
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SIGXFSZ P2001 Core File size limit exceeded (4.2BSD);
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see \fBsetrlimit\fP(2)
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SIGWINCH \- Ign Window resize signal (4.3BSD, Sun)
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.TE
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.PP
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The signals
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@ -264,28 +282,6 @@ and
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.B SIGSTOP
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cannot be caught, blocked, or ignored.
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.PP
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Next the signals not in the POSIX.1-1990 standard but described in
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SUSv2 and POSIX.1-2001.
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.TS
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l c c l
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____
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lB c c l.
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Signal Standard Action Comment
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SIGBUS P2001 Core Bus error (bad memory access)
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SIGPOLL P2001 Term Pollable event (Sys V).
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Synonym for \fBSIGIO\fP
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SIGPROF P2001 Term Profiling timer expired
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SIGSYS P2001 Core Bad system call (SVr4);
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see also \fBseccomp\fP(2)
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SIGTRAP P2001 Core Trace/breakpoint trap
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SIGURG P2001 Ign Urgent condition on socket (4.2BSD)
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SIGVTALRM P2001 Term Virtual alarm clock (4.2BSD)
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SIGXCPU P2001 Core CPU time limit exceeded (4.2BSD);
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see \fBsetrlimit\fP(2)
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SIGXFSZ P2001 Core File size limit exceeded (4.2BSD);
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see \fBsetrlimit\fP(2)
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.TE
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.PP
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Up to and including Linux 2.2, the default behavior for
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.BR SIGSYS ", " SIGXCPU ", " SIGXFSZ ", "
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and (on architectures other than SPARC and MIPS)
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@ -297,31 +293,6 @@ is to terminate the process without a core dump.)
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Linux 2.4 conforms to the POSIX.1-2001 requirements for these signals,
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terminating the process with a core dump.
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.PP
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Next various other signals.
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.TS
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l c c l
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____
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lB c c l.
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Signal Standard Action Comment
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SIGIOT \- Core IOT trap. A synonym for \fBSIGABRT\fP
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SIGEMT \- Term Emulator trap
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SIGSTKFLT \- Term Stack fault on coprocessor (unused)
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SIGIO \- Term I/O now possible (4.2BSD)
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SIGCLD \- Ign A synonym for \fBSIGCHLD\fP
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SIGPWR \- Term Power failure (System V)
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SIGINFO \- A synonym for \fBSIGPWR\fP
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SIGLOST \- Term File lock lost (unused)
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SIGWINCH \- Ign Window resize signal (4.3BSD, Sun)
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SIGUNUSED \- Core Synonymous with \fBSIGSYS\fP
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.TE
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.PP
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(Signal 29 is
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.B SIGINFO
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/
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.B SIGPWR
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on an alpha but
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.B SIGLOST
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on a sparc.)
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.PP
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.B SIGEMT
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is not specified in POSIX.1-2001, but nevertheless appears
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@ -336,15 +307,7 @@ by default on those other UNIX systems where it appears.
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.B SIGIO
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(which is not specified in POSIX.1-2001) is ignored by default
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on several other UNIX systems.
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.PP
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Where defined,
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.B SIGUNUSED
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is synonymous with
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.BR SIGSYS .
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Since glibc 2.26,
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.B SIGUNUSED
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is no longer defined on any architecture.
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.PP
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.\"
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.SS Signal numbering for standard signals
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The numeric value for each signal is given in the table below.
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As shown in the table, many signals have different numeric values
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