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// -*- C++ -*-
#include <sys/types.h>
#include <LString.h>
#ifdef __GNUG__
#pragma interface
#endif
/*@Doc:
Instance starts and represents childprocesses.
You should use this class if you need to start an external program in LyX.
You can start a child in the background and have a callback function
executed when the child finishes by using the DontWait starttype.
*/
class Systemcalls {
public:
///
enum Starttype {
System,
Wait,
DontWait
};
/// Callback function gets commandline and returnvalue from child
typedef void (*Callbackfct)(LString cmd, int retval);
///
Systemcalls();
/** Geberate instance and start childprocess
The string "what" contains a commandline with arguments separated
by spaces.
When the requested program finishes, the callback-function is
called with the commandline and the returnvalue from the program.
The instance is automatically added to a timercheck if starttype is
DontWait (i.e. background execution). When a background child
finishes, the timercheck will automatically call the callback
function.
*/
Systemcalls(Starttype how, LString what, Callbackfct call = 0);
///
~Systemcalls();
/** Start childprocess. what contains a command on systemlevel.
*/
int Startscript(Starttype how, LString what, Callbackfct call = 0); // for reuse
/** gets PID of childprocess. Used by timer */
inline pid_t Getpid() { return pid; }
/// Start callback
inline void Callback() { if (cbk) cbk(command, retval); }
/** Set return value. Used by timer */
inline void setRetValue(int r) { retval = r; }
private:
/// Type of execution: system, wait for child or background
Starttype start;
/// Callback function
Callbackfct cbk;
/// Commmand line
LString command;
/// Process ID of child
pid_t pid;
/// Return value from child
int retval;
///
int Startscript();
///
pid_t Fork();
/// Wait for child process to finish. Updates returncode from child.
void waitForChild();
};
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