src/common/process.c

#ifndef lint
static const char       RCSid[] = "$Id: process.c,v 2.7 2003/06/26 00:58:09 schorsch Exp $";
#endif
/*
 * Routines to communicate with separate process via dual pipes
 *
 * External symbols declared in standard.h
 */

#include "copyright.h"

#include "rtprocess.h"

/*

The functions open_process() and close_process() exist in
(currently) two versions, which are found in the files:

        win_process.c
        unix_process.c

*/

int
process(                /* process data through pd */
SUBPROC *pd,
char    *recvbuf, char *sendbuf,
int     nbr, int nbs
)
{
        if (nbs > PIPE_BUF)
                return(-1);
        if (!pd->running)
                return(-1);
        if (writebuf(pd->w, sendbuf, nbs) < nbs)
                return(-1);
        return(readbuf(pd->r, recvbuf, nbr));
}


int
readbuf(                /* read all of requested buffer */
int     fd,
char    *bpos,
int     siz
)
{
        register int    cc = 0, nrem = siz;
retry:
        while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) {
                bpos += cc;
                nrem -= cc;
        }
        if (cc < 0) {
#ifndef BSD
                if (errno == EINTR)     /* we were interrupted! */
                        goto retry;
#endif
                return(cc);
        }
        return(siz-nrem);
}


int
writebuf(               /* write all of requested buffer */
int     fd,
char    *bpos,
int     siz
)
{
        register int    cc = 0, nrem = siz;
retry:
        while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) {
                bpos += cc;
                nrem -= cc;
        }
        if (cc < 0) {
#ifndef BSD
                if (errno == EINTR)     /* we were interrupted! */
                        goto retry;
#endif
                return(cc);
        }
        return(siz-nrem);
}
Revision:	2.8
Committed:	Fri Sep 17 21:43:49 2004 UTC (21 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R2, rad5R1, rad5R0, rad4R2P2, rad4R2P1, rad4R2, rad4R1, rad4R0, rad3R9, rad3R8, rad3R7P2, rad3R7P1, rad3R6P1, rad3R6
Changes since 2.7:	+3 -1 lines
Log Message:	Added -n option to mkillum for multiprocessing on shared memory machine
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.8	static const char RCSid[] = "$Id: process.c,v 2.7 2003/06/26 00:58:09 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* Routines to communicate with separate process via dual pipes
6	greg	2.5	*
7			* External symbols declared in standard.h
8			*/
9
10	greg	2.6	#include "copyright.h"
11	greg	1.1
12	schorsch	2.7	#include "rtprocess.h"
13	greg	1.1
14	schorsch	2.7	/*
15	greg	1.1
16	schorsch	2.7	The functions open_process() and close_process() exist in
17			(currently) two versions, which are found in the files:
18	greg	1.1
19	schorsch	2.7	win_process.c
20			unix_process.c
21	greg	1.1
22	schorsch	2.7	*/
23	greg	2.4
24	greg	1.1	int
25	schorsch	2.7	process( /* process data through pd */
26			SUBPROC *pd,
27			char recvbuf, char sendbuf,
28			int nbr, int nbs
29			)
30	greg	1.1	{
31			if (nbs > PIPE_BUF)
32			return(-1);
33	greg	2.8	if (!pd->running)
34			return(-1);
35	schorsch	2.7	if (writebuf(pd->w, sendbuf, nbs) < nbs)
36	greg	1.1	return(-1);
37	schorsch	2.7	return(readbuf(pd->r, recvbuf, nbr));
38	greg	1.1	}
39
40
41
42			int
43	schorsch	2.7	readbuf( /* read all of requested buffer */
44			int fd,
45			char *bpos,
46			int siz
47			)
48	greg	1.1	{
49	greg	2.3	register int cc = 0, nrem = siz;
50	greg	2.4	retry:
51	greg	1.1	while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) {
52			bpos += cc;
53			nrem -= cc;
54			}
55	greg	2.4	if (cc < 0) {
56			#ifndef BSD
57			if (errno == EINTR) /* we were interrupted! */
58			goto retry;
59			#endif
60	greg	1.1	return(cc);
61	greg	2.4	}
62	greg	1.1	return(siz-nrem);
63			}
64
65
66			int
67	schorsch	2.7	writebuf( /* write all of requested buffer */
68			int fd,
69			char *bpos,
70			int siz
71			)
72	greg	1.1	{
73	greg	2.3	register int cc = 0, nrem = siz;
74	greg	2.4	retry:
75	greg	1.1	while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) {
76			bpos += cc;
77			nrem -= cc;
78			}
79	greg	2.4	if (cc < 0) {
80			#ifndef BSD
81			if (errno == EINTR) /* we were interrupted! */
82			goto retry;
83			#endif
84	greg	1.1	return(cc);
85	greg	2.4	}
86	greg	1.1	return(siz-nrem);
87			}