Takes care of the signal handling necessary for the functions in the PipeStream class. More...

Classes
struct	PipeStreamSignalHandling::process_status
Functions
bool	got_status (pid_t pid, int *status)
	Checks to see if the given process has exited.
void	expectAnother () throw (InputByteStreamError)
	Note that we expect to start another child.
void	childcatcher (int)
void	alarmcatcher (int)
Variables
process_status *	procs = 0
sig_atomic_t	nprocs
sig_atomic_t	nprocs_used

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Detailed Description

Takes care of the signal handling necessary for the functions in the PipeStream class.

If your application for whatever reason has to catch SIGCHLD, then to avoid interference between these, you should do so using functions expectAnother and got_status. These two functions are the only `public' API in this namespace.

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Function Documentation

void PipeStreamSignalHandling::alarmcatcher (  int   )

void PipeStreamSignalHandling::childcatcher (  int   )

void PipeStreamSignalHandling::expectAnother (   )  throw (InputByteStreamError)

Note that we expect to start another child. This function must be called before doing each fork(), as it does the initialisation of the structures used by this set of functions, and subsequently ensures that there is enough space in the list of statuses to hold another one. Exceptions: InputByteStreamError  if we can't do this for some reason

bool PipeStreamSignalHandling::got_status (  pid_t  pid, int *  status )

Checks to see if the given process has exited. If there's an entry for this PID in the list, then put the corresponding status in the status parameter, and return true. If not, return false; *status is then unchanged. Parameters: pid  the PID to check status  a pointer to the status to be returned Returns: true if the status was in fact available, and is now in *status; false otherwise

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Variable Documentation

sig_atomic_t PipeStreamSignalHandling::nprocs

sig_atomic_t PipeStreamSignalHandling::nprocs_used

struct process_status* PipeStreamSignalHandling::procs = 0

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