Functions
int	signalfd_init (void)

void	signalfd_catch (int sig)

void	signalfd_uncatch (int sig)

void	signalfd_close (void)

Detailed Description

Function Documentation

◆ signalfd_catch()

void signalfd_catch ( int sig )

Mark a signal as being caught through the signalfd interface.

Referenced by signalfd_close().

◆ signalfd_close()

void signalfd_close ( void )

Close the signalfd interface.

References obuf_endl(), obuf_put2s(), obuf_puti(), outbuf, signalfd_catch(), and signalfd_init().

Referenced by signalfd_init().

◆ signalfd_init()

int signalfd_init ( void )

Initialize the signal file descriptor.

This function creates a pipe through which signals will get passed. This is a way of handling signals that avoids most problems posed by UNIX signals. When a signal is caught by this interface, the numerical value of the signal is passed down the pipe as a native integer. The file descriptor is set to non-blocking mode to prevent blocking when reading from it.

To use the file descriptor, use either poll or select to determine when it is readable. When it becomes readable, read a single byte from it. The value of this byte indicates what signal was caught.

Due to the global nature of UNIX signal handling, only a single signalfd interface may be active at any time. Do not call signalfd_init multiple times without calling signalfd_close first.

Returns: -1 if an error occurred, otherwise the return value is the file descriptor opened for reading.

References signalfd_close().

Referenced by signalfd_close().

◆ signalfd_uncatch()

void signalfd_uncatch ( int sig )

Unmark a signal as being caught through the signalfd interface.