| 1 |
– |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
– |
|
| 1 |
|
#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 2 |
> |
static const char RCSid[] = "$Id$"; |
| 3 |
|
#endif |
| 6 |
– |
|
| 4 |
|
/* |
| 5 |
|
* Routines to communicate with separate process via dual pipes |
| 6 |
+ |
* |
| 7 |
+ |
* External symbols declared in standard.h |
| 8 |
|
*/ |
| 9 |
|
|
| 10 |
< |
/* find pipe buffer limit */ |
| 12 |
< |
#include <sys/param.h> |
| 10 |
> |
#include "copyright.h" |
| 11 |
|
|
| 12 |
< |
#ifndef PIPE_BUF |
| 15 |
< |
#ifdef PIPSIZ |
| 16 |
< |
#define PIPE_BUF PIPSIZ |
| 17 |
< |
#else |
| 18 |
< |
#ifdef PIPE_MAX |
| 19 |
< |
#define PIPE_BUF PIPE_MAX |
| 20 |
< |
#else |
| 21 |
< |
#define PIPE_BUF 512 /* hyperconservative */ |
| 22 |
< |
#endif |
| 23 |
< |
#endif |
| 24 |
< |
#endif |
| 12 |
> |
#include "rtprocess.h" |
| 13 |
|
|
| 14 |
< |
#ifndef BSD |
| 27 |
< |
#define vfork fork |
| 28 |
< |
#endif |
| 14 |
> |
/* |
| 15 |
|
|
| 16 |
+ |
The functions open_process() and close_process() exist in |
| 17 |
+ |
(currently) two versions, which are found in the files: |
| 18 |
|
|
| 19 |
< |
int |
| 20 |
< |
open_process(pd, av) /* open communication to separate process */ |
| 33 |
< |
int pd[3]; |
| 34 |
< |
char *av[]; |
| 35 |
< |
{ |
| 36 |
< |
extern char *getpath(), *getenv(); |
| 37 |
< |
char *compath; |
| 38 |
< |
int p0[2], p1[2]; |
| 39 |
< |
/* find executable */ |
| 40 |
< |
compath = getpath(av[0], getenv("PATH"), 1); |
| 41 |
< |
if (compath == 0) |
| 42 |
< |
return(0); |
| 43 |
< |
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 44 |
< |
return(-1); |
| 45 |
< |
if ((pd[2] = vfork()) == 0) { /* if child */ |
| 46 |
< |
close(p0[1]); |
| 47 |
< |
close(p1[0]); |
| 48 |
< |
if (p0[0] != 0) { /* connect p0 to stdin */ |
| 49 |
< |
dup2(p0[0], 0); |
| 50 |
< |
close(p0[0]); |
| 51 |
< |
} |
| 52 |
< |
if (p1[1] != 1) { /* connect p1 to stdout */ |
| 53 |
< |
dup2(p1[1], 1); |
| 54 |
< |
close(p1[1]); |
| 55 |
< |
} |
| 56 |
< |
execv(compath, av); /* exec command */ |
| 57 |
< |
perror(compath); |
| 58 |
< |
_exit(127); |
| 59 |
< |
} |
| 60 |
< |
if (pd[2] == -1) |
| 61 |
< |
return(-1); |
| 62 |
< |
close(p0[0]); |
| 63 |
< |
close(p1[1]); |
| 64 |
< |
pd[0] = p1[0]; |
| 65 |
< |
pd[1] = p0[1]; |
| 66 |
< |
return(PIPE_BUF); |
| 67 |
< |
} |
| 19 |
> |
win_process.c |
| 20 |
> |
unix_process.c |
| 21 |
|
|
| 22 |
+ |
*/ |
| 23 |
|
|
| 24 |
|
int |
| 25 |
< |
process(pd, recvbuf, sendbuf, nbr, nbs) /* process data through pd */ |
| 26 |
< |
int pd[3]; |
| 27 |
< |
char *recvbuf, *sendbuf; |
| 28 |
< |
int nbr, nbs; |
| 25 |
> |
process( /* process data through pd */ |
| 26 |
> |
SUBPROC *pd, |
| 27 |
> |
char *recvbuf, char *sendbuf, |
| 28 |
> |
int nbr, int nbs |
| 29 |
> |
) |
| 30 |
|
{ |
| 31 |
|
if (nbs > PIPE_BUF) |
| 32 |
|
return(-1); |
| 33 |
< |
if (writebuf(pd[1], sendbuf, nbs) < nbs) |
| 33 |
> |
if (writebuf(pd->w, sendbuf, nbs) < nbs) |
| 34 |
|
return(-1); |
| 35 |
< |
return(readbuf(pd[0], recvbuf, nbr)); |
| 35 |
> |
return(readbuf(pd->r, recvbuf, nbr)); |
| 36 |
|
} |
| 37 |
|
|
| 38 |
|
|
| 84 |
– |
int |
| 85 |
– |
close_process(pd) /* close pipes and wait for process */ |
| 86 |
– |
int pd[3]; |
| 87 |
– |
{ |
| 88 |
– |
int pid, status; |
| 39 |
|
|
| 90 |
– |
close(pd[1]); |
| 91 |
– |
close(pd[0]); |
| 92 |
– |
while ((pid = wait(&status)) != -1) |
| 93 |
– |
if (pid == pd[2]) |
| 94 |
– |
return(status>>8 & 0xff); |
| 95 |
– |
return(-1); /* ? unknown status */ |
| 96 |
– |
} |
| 97 |
– |
|
| 98 |
– |
|
| 40 |
|
int |
| 41 |
< |
readbuf(fd, bpos, siz) /* read all of requested buffer */ |
| 42 |
< |
int fd; |
| 43 |
< |
char *bpos; |
| 44 |
< |
int siz; |
| 41 |
> |
readbuf( /* read all of requested buffer */ |
| 42 |
> |
int fd, |
| 43 |
> |
char *bpos, |
| 44 |
> |
int siz |
| 45 |
> |
) |
| 46 |
|
{ |
| 47 |
< |
register int cc, nrem = siz; |
| 48 |
< |
|
| 47 |
> |
register int cc = 0, nrem = siz; |
| 48 |
> |
retry: |
| 49 |
|
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
| 50 |
|
bpos += cc; |
| 51 |
|
nrem -= cc; |
| 52 |
|
} |
| 53 |
< |
if (cc < 0) |
| 53 |
> |
if (cc < 0) { |
| 54 |
> |
#ifndef BSD |
| 55 |
> |
if (errno == EINTR) /* we were interrupted! */ |
| 56 |
> |
goto retry; |
| 57 |
> |
#endif |
| 58 |
|
return(cc); |
| 59 |
+ |
} |
| 60 |
|
return(siz-nrem); |
| 61 |
|
} |
| 62 |
|
|
| 63 |
|
|
| 64 |
|
int |
| 65 |
< |
writebuf(fd, bpos, siz) /* write all of requested buffer */ |
| 66 |
< |
int fd; |
| 67 |
< |
char *bpos; |
| 68 |
< |
int siz; |
| 65 |
> |
writebuf( /* write all of requested buffer */ |
| 66 |
> |
int fd, |
| 67 |
> |
char *bpos, |
| 68 |
> |
int siz |
| 69 |
> |
) |
| 70 |
|
{ |
| 71 |
< |
register int cc, nrem = siz; |
| 72 |
< |
|
| 71 |
> |
register int cc = 0, nrem = siz; |
| 72 |
> |
retry: |
| 73 |
|
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
| 74 |
|
bpos += cc; |
| 75 |
|
nrem -= cc; |
| 76 |
|
} |
| 77 |
< |
if (cc < 0) |
| 77 |
> |
if (cc < 0) { |
| 78 |
> |
#ifndef BSD |
| 79 |
> |
if (errno == EINTR) /* we were interrupted! */ |
| 80 |
> |
goto retry; |
| 81 |
> |
#endif |
| 82 |
|
return(cc); |
| 83 |
+ |
} |
| 84 |
|
return(siz-nrem); |
| 85 |
|
} |
