Quelle syscall.h Sprache: C

// -*- 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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