Signal Handling--ref

if (sigaction (SIGINT,&query_action) < 0)
/ sigaction returns -1 in case of error. /
else if (query_action.sa_handler == SIG_DFL)
/ SIGINT is handled in the default,fatal manner. /
else if (query_action.sa_handler == SIG_IGN)
/ SIGINT is ignored. /
else
/ A programmer-defined signal handler is in effect. /

sigaction

sa_flagsmember of thesigactionstructure is a catch-all for special features. Most of the time,SA_RESTARTis a good value to use for this field.

sa_flagsis interpreted as a bit mask. Thus,you should choose the flags you want to set,OR those flags together,and store the result in thesa_flagsmember of yoursigactionstructure.

sigactionaffects one particular signal number,and the flags that you specify apply only to that particular signal.

signalsets all the flags to zero except forSA_RESTART,whose value depends on the settings you have made withsiginterrupt. See section,to see what this is about.

`signal.h'.

intSA_NOCLDSTOP

This flag is meaningful only for theSIGCHLDsignal. When the flag is set,the system delivers the signal for a terminated child process but not for one that is stopped. By default,SIGCHLDis delivered for both terminated children and stopped children.

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