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| author | Jon Turney <jon.turney@dronecode.org.uk> | 2016-01-14 17:44:18 +0000 |
|---|---|---|
| committer | Jon Turney <jon.turney@dronecode.org.uk> | 2016-01-15 14:59:07 +0000 |
| commit | 9c8a6e56460cfa0b122884121561cb90a1864971 (patch) | |
| tree | 7b26662773045685faea8b3e438974cb83e86069 /winsup | |
| parent | d2216272f5a9ff2b9abcff31348ea28cc5805dbf (diff) | |
| download | cygnal-9c8a6e56460cfa0b122884121561cb90a1864971.tar.gz cygnal-9c8a6e56460cfa0b122884121561cb90a1864971.tar.bz2 cygnal-9c8a6e56460cfa0b122884121561cb90a1864971.zip | |
faq: Update FAQ question and answer about gdb and signals
* faq-programming.xml: Update question and answer about gdb and signals.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Diffstat (limited to 'winsup')
| -rw-r--r-- | winsup/doc/faq-programming.xml | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/winsup/doc/faq-programming.xml b/winsup/doc/faq-programming.xml index 0c936ebd6..18557c0d1 100644 --- a/winsup/doc/faq-programming.xml +++ b/winsup/doc/faq-programming.xml @@ -859,15 +859,22 @@ on using <literal>strace</literal>, see the Cygwin User's Guide. </answer></qandaentry> <qandaentry id="faq.programming.gdb-signals"> -<question><para>Why doesn't gdb handle signals?</para></question> +<question><para>How does gdb handle signals?</para></question> <answer> -<para>Unfortunately, there is only minimal signal handling support in gdb -currently. Signal handling only works with Windows-type signals. -SIGINT may work, SIGFPE may work, SIGSEGV definitely does. You cannot -'stop', 'print' or 'nopass' signals like SIGUSR1 or SIGHUP to the -process being debugged. +<para> +gdb maps known Windows exceptions to signals such as SIGSEGV, SIGFPE, SIGTRAP, +SIGINT and SIGILL. Other Windows exceptions are passed on to the handler (if +any), and reported as an unknown signal if an unhandled (second chance) +exception occurs. </para> + +<para> +There is also an experimental feature to notify gdb of purely Cygwin signals +like SIGABRT, SIGHUP or SIGUSR1. This currently has some known problems, for +example, single-stepping from these signals may not work as expected. +</para> + </answer></qandaentry> <qandaentry id="faq.programming.linker"> |