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src: rework early debug signal handling#615

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bnoordhuis merged 3 commits intonodejs:v1.xfrom
bnoordhuis:rework-signal-handling
Jan 28, 2015
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src: rework early debug signal handling#615
bnoordhuis merged 3 commits intonodejs:v1.xfrom
bnoordhuis:rework-signal-handling

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@bnoordhuis bnoordhuis commented Jan 26, 2015

Instead of installing an early debug signal handler, simply block the
SIGUSR1 signal at start-up and unblock it when the debugger is ready.

Both approaches are functionally equivalent but blocking the signal
accomplishes it in fewer lines of code.

R=@sam-github? It's not necessary to SIG_DFL SIGCHLD because
libuv installs its own handler when it spawns a process, but it does
seem like a good idea to explicitly install default handlers.

https://jenkins-iojs.nodesource.com/view/iojs/job/iojs+any-pr+multi/116/

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sam-github commented Jan 26, 2015

LGTM, and thanks. I agree that setting all the sighandlers to default is a good idea, SIG_IGN is inheritable across exec.

For the record, I noticed this problem with a bug in some of my code that was masking out SIGCHLD until ppoll(), but I forgot that after forking I'd have to clear the procmask before execing node as a child process. That caused uv to never received SIGCHLD, and so to never notice child process exit.

@bnoordhuis
src: do platform-specific initialization earlier
5756f92 
Execute the per-platform initialization logic as early as possible,
for two reasons:

1. It opens the way for an upcoming commit to simplify early SIGUSR1
   handling.

2. It should make life easier for embedders because io.js no longer
   mucks around with the file descriptor limit or signal disposition
   of the process.

PR-URL: nodejs#615
Reviewed-By: Sam Roberts <sam@strongloop.com>
@bnoordhuis
src: rework early debug signal handling
63ae1d2 
Instead of installing an early debug signal handler, simply block the
SIGUSR1 signal at start-up and unblock it when the debugger is ready.

Both approaches are functionally equivalent but blocking the signal
accomplishes it in fewer lines of code.

PR-URL: nodejs#615
Reviewed-By: Sam Roberts <sam@strongloop.com>
@bnoordhuis
src: set default signal dispositions at start-up
dd47a8c 
Signal dispositions are inherited by child processes.  Restore ours to
sane defaults in case our parent process changed it, to prevent quirky
behavior when the parent does something silly like ignoring SIGSEGV.

PR-URL: nodejs#615
Reviewed-By: Sam Roberts <sam@strongloop.com>
@bnoordhuis bnoordhuis force-pushed the rework-signal-handling branch from f64f97d to dd47a8c Compare January 28, 2015 16:47
@bnoordhuis bnoordhuis merged commit dd47a8c into nodejs:v1.x Jan 28, 2015
@bnoordhuis bnoordhuis deleted the rework-signal-handling branch January 28, 2015 16:47
@sxa sxa mentioned this pull request Dec 29, 2016
Closed
gibfahn pushed a commit that referenced this pull request Jan 17, 2017
@gibfahn
build: don't squash signal handlers with --shared
0f0f3d3 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: #10539
Fixes: #10520
Refs: #615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
sxa pushed a commit to sxa/node that referenced this pull request Jan 18, 2017
build: don't squash signal handlers with --shared
3c0e5f0 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: nodejs#10539
Fixes: nodejs#10520
Refs: nodejs#615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 18, 2017
build: don't squash signal handlers with --shared
e7f72a4 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: nodejs#10539
Fixes: nodejs#10520
Refs: nodejs#615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 23, 2017
build: don't squash signal handlers with --shared
e8ee2af 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: nodejs#10539
Fixes: nodejs#10520
Refs: nodejs#615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 25, 2017
build: don't squash signal handlers with --shared
b9698f1 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: nodejs#10539
Fixes: nodejs#10520
Refs: nodejs#615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 27, 2017
build: don't squash signal handlers with --shared
a408ba6 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: nodejs#10539
Fixes: nodejs#10520
Refs: nodejs#615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
sxa pushed a commit to sxa/node that referenced this pull request Feb 1, 2017
build: don't squash signal handlers with --shared
1f4e3e4 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: nodejs#10539
Fixes: nodejs#10520
Refs: nodejs#615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
MylesBorins pushed a commit that referenced this pull request Feb 21, 2017
@MylesBorins
build: don't squash signal handlers with --shared
9297c58 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: #10539
Fixes: #10520
Refs: #615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
MylesBorins pushed a commit that referenced this pull request Feb 22, 2017
@MylesBorins
build: don't squash signal handlers with --shared
9b35715 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: #10539
Fixes: #10520
Refs: #615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
MylesBorins pushed a commit that referenced this pull request Mar 8, 2017
@MylesBorins
build: don't squash signal handlers with --shared
a61b5e6 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: #10539
Fixes: #10520
Refs: #615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
MylesBorins pushed a commit that referenced this pull request Mar 9, 2017
@MylesBorins
build: don't squash signal handlers with --shared
b7c5295 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: #10539
Fixes: #10520
Refs: #615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
MylesBorins pushed a commit that referenced this pull request Mar 9, 2017
@MylesBorins
build: don't squash signal handlers with --shared
e0dc0ce 
An application using node built as a shared library may legitimately
implement its own signal handling routines. Current behaviour is
to squash all signal handlers on node startup. This change will
stop that behaviour when node is built as a shared library.

PR-URL: #10539
Fixes: #10520
Refs: #615
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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@bnoordhuis @sam-github