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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2008-10-04 08:33:53 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2008-10-04 08:33:53 +0200 |
| commit | d5c882987409f9bb5d35a079dc3db20606485e4c (patch) | |
| tree | 83f7d174506e62550cfdc1017cf1e2b487eb222e /man7/signal.7 | |
| parent | 3fb46b2b3b6ecd39d0ca465288977234f6e63f70 (diff) | |
| download | man-pages-d5c882987409f9bb5d35a079dc3db20606485e4c.tar.gz | |
signal.7: describe semantics w.r.t. fork() and execve()
Include text describing semantics of fork() and execve() for
signal dispositions, signal mask, and pending signal set.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/signal.7')
| -rw-r--r-- | man7/signal.7 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/man7/signal.7 b/man7/signal.7 index c7e9b1ac5f..a300b101f3 100644 --- a/man7/signal.7 +++ b/man7/signal.7 @@ -81,6 +81,14 @@ when the signal is delivered. The signal disposition is a per-process attribute: in a multithreaded application, the disposition of a particular signal is the same for all threads. + +A child created via +.BR fork (2) +inherits a copy of its parent's signal dispositions. +During an +.BR execve (2), +the dispositions of handled signals are reset to the default; +the dispositions of ignored signals are left unchanged. .SS "Signal Mask and Pending Signals" A signal may be .IR blocked , @@ -98,6 +106,12 @@ In a traditional single-threaded application, .BR sigprocmask (2) can be used to manipulate the signal mask. +A child created via +.BR fork (2) +inherits a copy of its parent's signal mask; +the signal mask is preserved across +.BR execve (2). + A signal may be generated (and thus pending) for a process as a whole (e.g., when sent using .BR kill (2)) @@ -121,6 +135,12 @@ using This set will consist of the union of the set of pending process-directed signals and the set of signals pending for the calling thread. + +A child created via +.BR fork (2) +initially has an empty pending signal set; +the pending signal set is preserved across an +.BR execve (2). .SS "Standard Signals" Linux supports the standard signals listed below. Several signal numbers |