| 1 |
greg |
1.1 |
#ifndef lint |
| 2 |
greg |
2.11 |
static const char RCSid[] = "$Id: process.c,v 2.10 2020/04/03 17:06:16 greg Exp $"; |
| 3 |
greg |
1.1 |
#endif |
| 4 |
|
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/* |
| 5 |
|
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* Routines to communicate with separate process via dual pipes |
| 6 |
greg |
2.5 |
* |
| 7 |
greg |
2.11 |
* External symbols declared in rtprocess.h |
| 8 |
greg |
2.5 |
*/ |
| 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 |
greg |
2.9 |
SUBPROC *pd, |
| 27 |
|
|
char *recvbuf, char *sendbuf, |
| 28 |
|
|
int nbr, int nbs |
| 29 |
schorsch |
2.7 |
) |
| 30 |
greg |
1.1 |
{ |
| 31 |
greg |
2.9 |
if (!(pd->flags & PF_RUNNING)) |
| 32 |
greg |
2.8 |
return(-1); |
| 33 |
schorsch |
2.7 |
if (writebuf(pd->w, sendbuf, nbs) < nbs) |
| 34 |
greg |
1.1 |
return(-1); |
| 35 |
schorsch |
2.7 |
return(readbuf(pd->r, recvbuf, nbr)); |
| 36 |
greg |
1.1 |
} |
| 37 |
|
|
|
| 38 |
|
|
|
| 39 |
|
|
|
| 40 |
greg |
2.11 |
ssize_t |
| 41 |
schorsch |
2.7 |
readbuf( /* read all of requested buffer */ |
| 42 |
greg |
2.9 |
int fd, |
| 43 |
|
|
char *bpos, |
| 44 |
greg |
2.11 |
ssize_t siz |
| 45 |
schorsch |
2.7 |
) |
| 46 |
greg |
1.1 |
{ |
| 47 |
greg |
2.11 |
ssize_t cc = 0, nrem = siz; |
| 48 |
greg |
2.4 |
retry: |
| 49 |
greg |
1.1 |
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
| 50 |
|
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bpos += cc; |
| 51 |
|
|
nrem -= cc; |
| 52 |
|
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} |
| 53 |
greg |
2.4 |
if (cc < 0) { |
| 54 |
|
|
#ifndef BSD |
| 55 |
|
|
if (errno == EINTR) /* we were interrupted! */ |
| 56 |
|
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goto retry; |
| 57 |
|
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#endif |
| 58 |
greg |
1.1 |
return(cc); |
| 59 |
greg |
2.4 |
} |
| 60 |
greg |
1.1 |
return(siz-nrem); |
| 61 |
|
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} |
| 62 |
|
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|
| 63 |
|
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|
| 64 |
greg |
2.11 |
ssize_t |
| 65 |
schorsch |
2.7 |
writebuf( /* write all of requested buffer */ |
| 66 |
|
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int fd, |
| 67 |
|
|
char *bpos, |
| 68 |
greg |
2.11 |
ssize_t siz |
| 69 |
schorsch |
2.7 |
) |
| 70 |
greg |
1.1 |
{ |
| 71 |
greg |
2.11 |
ssize_t cc = 0, nrem = siz; |
| 72 |
greg |
2.4 |
retry: |
| 73 |
greg |
1.1 |
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
| 74 |
|
|
bpos += cc; |
| 75 |
|
|
nrem -= cc; |
| 76 |
|
|
} |
| 77 |
greg |
2.4 |
if (cc < 0) { |
| 78 |
|
|
#ifndef BSD |
| 79 |
|
|
if (errno == EINTR) /* we were interrupted! */ |
| 80 |
|
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goto retry; |
| 81 |
|
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#endif |
| 82 |
greg |
1.1 |
return(cc); |
| 83 |
greg |
2.4 |
} |
| 84 |
greg |
1.1 |
return(siz-nrem); |
| 85 |
|
|
} |
