| 10 |
|
|
| 11 |
|
#include "copyright.h" |
| 12 |
|
|
| 13 |
– |
#include <sys/types.h> |
| 13 |
|
#include <sys/wait.h> |
| 14 |
+ |
#include <stdlib.h> |
| 15 |
|
|
| 16 |
|
#include "rtprocess.h" |
| 17 |
+ |
#include "rtio.h" |
| 18 |
|
|
| 19 |
|
|
| 20 |
+ |
SUBPROC sp_inactive = SP_INACTIVE; |
| 21 |
+ |
|
| 22 |
+ |
|
| 23 |
|
int |
| 24 |
|
open_process( /* open communication to separate process */ |
| 25 |
< |
SUBPROC *pd, |
| 26 |
< |
char *av[] |
| 25 |
> |
SUBPROC *pd, |
| 26 |
> |
char *av[] |
| 27 |
|
) |
| 28 |
|
{ |
| 25 |
– |
extern char *getpath(), *getenv(); |
| 29 |
|
char *compath; |
| 30 |
|
int p0[2], p1[2]; |
| 31 |
|
|
| 32 |
< |
pd->running = 0; /* not yet */ |
| 33 |
< |
/* find executable */ |
| 34 |
< |
compath = getpath(av[0], getenv("PATH"), 1); |
| 35 |
< |
if (compath == 0) |
| 32 |
> |
if (pd->pid > 0) |
| 33 |
> |
return(-1); /* need to close, first */ |
| 34 |
> |
|
| 35 |
> |
if ((pd->flags&(PF_FILT_INP|PF_FILT_OUT)) == (PF_FILT_INP|PF_FILT_OUT)) |
| 36 |
> |
return(-1); /* circular process not supported */ |
| 37 |
> |
|
| 38 |
> |
pd->flags &= ~PF_RUNNING; /* not running for sure */ |
| 39 |
> |
pd->pid = -1; |
| 40 |
> |
|
| 41 |
> |
if (av == NULL) /* cloning operation? */ |
| 42 |
> |
compath = NULL; |
| 43 |
> |
else if ((compath = getpath(av[0], getenv("PATH"), X_OK)) == NULL) |
| 44 |
|
return(0); |
| 45 |
< |
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 45 |
> |
|
| 46 |
> |
if (pd->flags & PF_FILT_INP) { /* filterning input stream? */ |
| 47 |
> |
if ((pd->r < 0) | (pd->r == 1)) |
| 48 |
> |
return(-1); |
| 49 |
> |
p0[0] = pd->r; |
| 50 |
> |
p0[1] = -1; |
| 51 |
> |
} else if (pipe(p0) < 0) |
| 52 |
|
return(-1); |
| 53 |
< |
if ((pd->pid = fork()) == 0) { /* if child */ |
| 53 |
> |
|
| 54 |
> |
if (pd->flags & PF_FILT_OUT) { /* filtering output stream? */ |
| 55 |
> |
if (pd->w < 1) |
| 56 |
> |
return(-1); |
| 57 |
> |
p1[0] = -1; |
| 58 |
> |
p1[1] = pd->w; |
| 59 |
> |
} else if (pipe(p1) < 0) |
| 60 |
> |
return(-1); |
| 61 |
> |
pd->pid = fork(); |
| 62 |
> |
if (pd->pid == 0) { /* if child... */ |
| 63 |
|
close(p0[1]); |
| 64 |
|
close(p1[0]); |
| 65 |
|
if (p0[0] != 0) { /* connect p0 to stdin */ |
| 66 |
< |
dup2(p0[0], 0); |
| 66 |
> |
if (dup2(p0[0], 0) < 0) |
| 67 |
> |
return(-1); |
| 68 |
|
close(p0[0]); |
| 69 |
|
} |
| 70 |
|
if (p1[1] != 1) { /* connect p1 to stdout */ |
| 71 |
< |
dup2(p1[1], 1); |
| 71 |
> |
if (dup2(p1[1], 1) < 0) |
| 72 |
> |
return(-1); |
| 73 |
|
close(p1[1]); |
| 74 |
|
} |
| 75 |
+ |
if (compath == NULL) /* just cloning? */ |
| 76 |
+ |
return(0); |
| 77 |
+ |
/* else clear streams' FD_CLOEXEC */ |
| 78 |
+ |
if (p0[0] == 0) |
| 79 |
+ |
fcntl(0, F_SETFD, 0); |
| 80 |
+ |
if (p1[1] == 1) |
| 81 |
+ |
fcntl(1, F_SETFD, 0); |
| 82 |
|
execv(compath, av); /* exec command */ |
| 83 |
|
perror(compath); |
| 84 |
|
_exit(127); |
| 85 |
|
} |
| 86 |
|
if (pd->pid == -1) |
| 87 |
|
return(-1); |
| 88 |
< |
close(p0[0]); |
| 89 |
< |
close(p1[1]); |
| 90 |
< |
pd->r = p1[0]; |
| 91 |
< |
pd->w = p0[1]; |
| 92 |
< |
pd->running = 1; |
| 88 |
> |
/* connect parent's streams */ |
| 89 |
> |
if (!(pd->flags & PF_FILT_INP)) { |
| 90 |
> |
close(p0[0]); |
| 91 |
> |
pd->r = p1[0]; |
| 92 |
> |
} else if (p1[0] != pd->r) { |
| 93 |
> |
if (dup2(p1[0], pd->r) < 0) |
| 94 |
> |
return(-1); |
| 95 |
> |
close(p1[0]); |
| 96 |
> |
} |
| 97 |
> |
if (!(pd->flags & PF_FILT_OUT)) { |
| 98 |
> |
close(p1[1]); |
| 99 |
> |
pd->w = p0[1]; |
| 100 |
> |
} else if (p0[1] != pd->w) { |
| 101 |
> |
if (dup2(p0[1], pd->w) < 0) |
| 102 |
> |
return(-1); |
| 103 |
> |
close(p0[1]); |
| 104 |
> |
} |
| 105 |
> |
/* |
| 106 |
> |
* Close write stream on exec to avoid multiprocessing deadlock. |
| 107 |
> |
* No use in read stream without it, so set flag there as well. |
| 108 |
> |
* GW: This bug took me two days to figure out!! |
| 109 |
> |
*/ |
| 110 |
> |
if (pd->r > 0) |
| 111 |
> |
fcntl(pd->r, F_SETFD, FD_CLOEXEC); |
| 112 |
> |
if (pd->w > 1) |
| 113 |
> |
fcntl(pd->w, F_SETFD, FD_CLOEXEC); |
| 114 |
> |
pd->flags |= PF_RUNNING; |
| 115 |
|
return(PIPE_BUF); |
| 116 |
|
} |
| 117 |
|
|
| 118 |
|
|
| 62 |
– |
|
| 119 |
|
int |
| 120 |
< |
close_process( /* close pipes and wait for process */ |
| 121 |
< |
SUBPROC *pd |
| 120 |
> |
close_processes( /* close pipes and wait for processes to finish */ |
| 121 |
> |
SUBPROC pd[], |
| 122 |
> |
int nproc |
| 123 |
|
) |
| 124 |
|
{ |
| 125 |
< |
int pid, status; |
| 125 |
> |
int togo = nproc; |
| 126 |
> |
int status, rtn_status = 0; |
| 127 |
> |
RT_PID pid; |
| 128 |
> |
int i; |
| 129 |
|
|
| 130 |
< |
if (!pd->running) |
| 131 |
< |
return(0); |
| 132 |
< |
close(pd->r); |
| 133 |
< |
close(pd->w); |
| 134 |
< |
pd->running = 0; |
| 135 |
< |
if (waitpid(pd->pid, &status, 0) == pd->pid) |
| 130 |
> |
for (i = 0; i < nproc; i++) /* close pipes, first */ |
| 131 |
> |
if (pd[i].flags & PF_RUNNING) { |
| 132 |
> |
close(pd[i].w); |
| 133 |
> |
close(pd[i].r); |
| 134 |
> |
pd[i].flags &= ~PF_RUNNING; |
| 135 |
> |
} else |
| 136 |
> |
togo -= (pd[i].pid < 0); |
| 137 |
> |
if (nproc == 1) { /* await specific process? */ |
| 138 |
> |
status = 0; |
| 139 |
> |
if (waitpid(pd->pid, &status, 0) != pd->pid) |
| 140 |
> |
return(-1); |
| 141 |
> |
*pd = sp_inactive; |
| 142 |
|
return(status>>8 & 0xff); |
| 143 |
< |
return(-1); /* ? unknown status */ |
| 143 |
> |
} |
| 144 |
> |
/* else unordered wait */ |
| 145 |
> |
while (togo > 0 && (pid = wait(&status)) >= 0) { |
| 146 |
> |
for (i = nproc; i-- > 0; ) |
| 147 |
> |
if (pd[i].pid == pid) { |
| 148 |
> |
pd[i] = sp_inactive; |
| 149 |
> |
--togo; |
| 150 |
> |
break; |
| 151 |
> |
} |
| 152 |
> |
if (i < 0) |
| 153 |
> |
continue; /* child we don't know? */ |
| 154 |
> |
status = status>>8 & 0xff; |
| 155 |
> |
if (status) /* record non-zero status */ |
| 156 |
> |
rtn_status = status; |
| 157 |
> |
} |
| 158 |
> |
if (togo) /* child went missing? */ |
| 159 |
> |
return(-1); |
| 160 |
> |
return(rtn_status); |
| 161 |
|
} |
| 79 |
– |
|
| 80 |
– |
|
