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/* RCSid $Id$ */
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/*
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* rtprocess.h
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* Routines to communicate with separate process via dual pipes
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*
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* WARNING: On Windows, there's a system header named <process.h>.
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*/
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#ifndef _RAD_PROCESS_H_
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#define _RAD_PROCESS_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "copyright.h"
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#include <sys/types.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/param.h>
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#include <unistd.h>
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#endif
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#ifndef BSD
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#include <errno.h>
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#endif
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#include "paths.h"
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/* On Windows, a process ID is a DWORD. That might actually be the
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same thing as an int, but it's better not to assume anything.
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This means that we shouldn't rely on PIDs and file descriptors
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being the same type, so we have to describe processes with a struct,
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instead of the original int[3]. To keep things simple, we typedef
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the posix pid_t on those systems that don't have it already.
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Some older Windows systems use negative PIDs. Open_process() and
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close_process() will convert those to positive values during
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runtime, so that client modules can still use -1 as invalid PID.
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*/
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#ifdef _WIN32
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typedef DWORD pid_t;
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#endif
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#ifndef PIPE_BUF
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#ifdef PIPSIZ
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#define PIPE_BUF PIPSIZ
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#else
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#ifdef PIPE_MAX
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#define PIPE_BUF PIPE_MAX
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#else
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#define PIPE_BUF 512 /* hyperconservative */
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#endif
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#endif
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#endif
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typedef struct {
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int r; /* read handle */
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int w; /* write handle */
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int running; /* doing something */
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pid_t pid; /* process ID */
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} SUBPROC;
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#define SP_INACTIVE {-1,-1,0,0} /* for static initializations */
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extern int open_process(SUBPROC *pd, char *av[]);
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extern int close_process(SUBPROC *pd);
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extern int process(SUBPROC *pd, char *recvbuf, char *sendbuf, int nbr, int nbs);
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extern int readbuf(int fd, char *bpos, int siz);
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extern int writebuf(int fd, char *bpos, int siz);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_PROCESS_H_ */
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