sigaction

Syntax

  #include <signal.h>
  
  struct sigaction
  {
     void     (*sa_handler)( int );
     sigset_t   sa_mask;
     int        sa_flags;
  };
  

Fields

sa_handler

Points to the function to call

sa_mask

Specifies a mask of signals which should be blocked during execution of the signal handler.

sa_flags

Specifies a set of flags which modify the behavior of the signal handling process. It is formed by the bitwise OR of zero or more of the following:

Flag	Value	Description
SA_NOCLDSTOP	0x00000001	Indicates that the process does not want to receive notification when a child process stops.
SA_ONESHOT	0x00000002	Restores the signal action to the default state once the signal handler has been called
SA_RESETHAND	0x00000002	Same as SA_ONESHOT.
SA_ONSTACK	0x00000004	Calls the signal handler on an alternate signal stack. If an alternate stack is not available, the default stack is used.
SA_RESTART	0x00000008	Makes certain system calls restartable across signals.
SA_NODEFER	0x00000010	Allows the signal to be received from within its own signal handle.
SA_NOMASK	0x00000010	Same as SA_NODEFER.
SA_SIGINFO	0x00000020	Indicates that the sa_handler field has been replaced with a pointer to a signal catching function.