11-11-2010
yes, then what is the defaut behavior in detail of threse signals?
for example, the default action of TERM is to terminate the process, then my question is what the detail procedures of the default action are , will it do something extra before actually killing the process?
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LEARN ABOUT SUNOS
ssignal
ssignal(3C) Standard C Library Functions ssignal(3C)
NAME
ssignal, gsignal - software signals
SYNOPSIS
#include <signal.h>
void(*ssignal (int sig, int (*action)(int)))(int);
int gsignal(int sig);
DESCRIPTION
The ssignal() and gsignal() functions implement a software facility similar to signal(3C). This facility is made available to users for
their own purposes.
ssignal()
Software signals made available to users are associated with integers in the inclusive range 1 through 17. A call to ssignal() associates a
procedure, action, with the software signal sig; the software signal, sig, is raised by a call to gsignal(). Raising a software signal
causes the action established for that signal to be taken.
The first argument to ssignal() is a number identifying the type of signal for which an action is to be established. The second argument
defines the action; it is either the name of a (user-defined) action function or one of the manifest constants SIG_DFL (default) or SIG_IGN
(ignore). The ssignal() function returns the action previously established for that signal type; if no action has been established or the
signal number is illegal, ssignal() returns SIG_DFL.
gsignal()
The gsignal() raises the signal identified by its argument, sig.
If an action function has been established for sig, then that action is reset to SIG_DFL and the action function is entered with argument
sig. The gsignal() function returns the value returned to it by the action function.
If the action for sig is SIG_IGN, gsignal() returns the value 1 and takes no other action.
If the action for sig is SIG_DFL, gsignal() returns the value 0 and takes no other action.
If sig has an illegal value or no action was ever specified for sig, gsignal() returns the value 0 and takes no other action.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Unsafe |
+-----------------------------+-----------------------------+
SEE ALSO
raise(3C), signal(3C), attributes(5)
SunOS 5.10 29 Dec 1996 ssignal(3C)