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The difference between aseptic and non sterile protective clothing

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The difference between aseptic and non sterile protective clothing
sigaction - Wikipedia
sigaction - Wikipedia

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.

SIGACTION
SIGACTION

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

sigaction: examine and change a signal action - Linux Man ...
sigaction: examine and change a signal action - Linux Man ...

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 .

How to Write Advanced Signal Handlers - Oracle
How to Write Advanced Signal Handlers - Oracle

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.

sigaction: examine and change a signal action - Linux Man ...
sigaction: examine and change a signal action - Linux Man ...

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.

sigaction(2) - Oracle
sigaction(2) - Oracle

The sa_mask member specifies a set of signals to be blocked while the signal handler is active. On entry to the signal handler, that set of signals is added to the set of signals already being blocked when the signal is delivered.

sigaction() -- examine and change signal action
sigaction() -- examine and change signal action

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 .

sigaction linux command man page
sigaction linux command man page

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.

LinuxQuestions.org - Should I use signal() or sigaction
LinuxQuestions.org - Should I use signal() or sigaction

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.

Blocking Signals (The GNU C Library)
Blocking Signals (The GNU C Library)

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 :