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The sigaction () function provides an interface for reliable signals in replacement of the unreliable and deprecated signal () function. Signal handlers installed by the signal () interface will be uninstalled immediately prior to execution of the handler.
The ,sigaction, system call is used to change the action taken by a process on receipt of a specific signal.. signum specifies the signal and can be any valid signal except SIGKILL and SIGSTOP.. If act is non−null, the new action for signal signum is installed from act.If oldact is non−null, the previous action is saved in oldact. The ,sigaction, structure is defined as
The sigaction () system call is used to change the action taken by a process on receipt of a specific signal. (See signal (7) for an overview of signals.) signum specifies the signal and can be any valid signal except SIGKILL and SIGSTOP . If act is non-NULL, the new action for signal signum is installed from act .
To pass information about the handler to ,sigaction,(), we need to use a ,sigaction, structure, which takes the address of the routine that will handle the signal, as well as certain other settings. The ,sa_mask, field indicates any signals that should be blocked while the signal handler is being executed.
In other words, if SIGKILL is included in the ,sa_mask, field of act, it is unspecified whether or not a subsequent call to ,sigaction,() returns with SIGKILL included in the ,sa_mask, field of oact. The SA_NOCLDSTOP flag, when supplied in the act -> sa_flags parameter, allows overloading SIGCHLD with the System V semantics that each SIGCLD signal indicates a single terminated child.
The sigaction() function examines and changes the signal action. Specifically, it allows the calling process to examine and/or specify the action that is taken when a specific signal is delivered. sig specifies the signal and can be assigned any signal except SIGKILL or SIGSTOP .
sa_mask, specifies a mask of signals which should be blocked (i.e., ... Linux implementation allowed the receipt of any signal, not just the one we are installing (effectively overriding any ,sa_mask, settings). ,sigaction,() can be called with a NULL second argument to query the current signal handler.
Should I use signal() or ,sigaction,(), I'm makeing a server that have child proc, and Im using select(), I must handle signals like SIGCHL, SIGPIPE, SIGINT, SIGTERM, ..... In the case of using ,sigaction, what does the folowing code means.
You can set ,sa_mask, in your ,sigaction, call to block certain signals while a particular signal handler runs. This way, the signal handler can run without being interrupted itself by signals. • Why Block : The purpose of blocking signals. • Signal Sets :