| 17 |
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#include "rtio.h" |
| 18 |
|
|
| 19 |
|
|
| 20 |
+ |
SUBPROC sp_inactive = SP_INACTIVE; |
| 21 |
+ |
|
| 22 |
+ |
|
| 23 |
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int |
| 24 |
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open_process( /* open communication to separate process */ |
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< |
SUBPROC *pd, |
| 26 |
< |
char *av[] |
| 25 |
> |
SUBPROC *pd, |
| 26 |
> |
char *av[] |
| 27 |
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) |
| 28 |
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{ |
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char *compath; |
| 30 |
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int p0[2], p1[2]; |
| 31 |
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|
| 32 |
< |
pd->pid = -1; |
| 33 |
< |
pd->running = 0; /* not going yet */ |
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> |
if (pd->pid > 0) |
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> |
return(-1); /* need to close, first */ |
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|
|
| 35 |
+ |
if ((pd->flags & (PF_FILT_INP|PF_FILT_OUT)) == (PF_FILT_INP|PF_FILT_OUT)) |
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+ |
return(-1); /* circular process not supported */ |
| 37 |
+ |
|
| 38 |
+ |
pd->flags &= ~PF_RUNNING; /* not running for sure */ |
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+ |
pd->pid = -1; |
| 40 |
+ |
|
| 41 |
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if (av == NULL) /* cloning operation? */ |
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compath = NULL; |
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else if ((compath = getpath(av[0], getenv("PATH"), X_OK)) == NULL) |
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return(0); |
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< |
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 45 |
> |
|
| 46 |
> |
if (pd->flags & PF_FILT_INP) { /* filterning input stream? */ |
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> |
if ((pd->r < 0) | (pd->r == 1)) |
| 48 |
> |
return(-1); |
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> |
p0[0] = pd->r; |
| 50 |
> |
p0[1] = -1; |
| 51 |
> |
} else if (pipe(p0) < 0) |
| 52 |
|
return(-1); |
| 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 |
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#ifdef BSD |
| 62 |
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if (compath != NULL) |
| 63 |
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pd->pid = vfork(); /* more efficient with exec() */ |
| 68 |
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close(p0[1]); |
| 69 |
|
close(p1[0]); |
| 70 |
|
if (p0[0] != 0) { /* connect p0 to stdin */ |
| 71 |
< |
dup2(p0[0], 0); |
| 71 |
> |
if (dup2(p0[0], 0) < 0) |
| 72 |
> |
return(-1); |
| 73 |
|
close(p0[0]); |
| 74 |
|
} |
| 75 |
|
if (p1[1] != 1) { /* connect p1 to stdout */ |
| 76 |
< |
dup2(p1[1], 1); |
| 76 |
> |
if (dup2(p1[1], 1) < 0) |
| 77 |
> |
return(-1); |
| 78 |
|
close(p1[1]); |
| 79 |
|
} |
| 80 |
|
if (compath == NULL) /* just cloning? */ |
| 81 |
|
return(0); |
| 82 |
< |
execv(compath, av); /* else exec command */ |
| 82 |
> |
/* else clear streams' FD_CLOEXEC */ |
| 83 |
> |
if (p0[0] == 0) |
| 84 |
> |
fcntl(0, F_SETFD, 0); |
| 85 |
> |
if (p1[1] == 1) |
| 86 |
> |
fcntl(1, F_SETFD, 0); |
| 87 |
> |
execv(compath, av); /* exec command */ |
| 88 |
|
perror(compath); |
| 89 |
|
_exit(127); |
| 90 |
|
} |
| 91 |
|
if (pd->pid == -1) |
| 92 |
|
return(-1); |
| 93 |
< |
close(p0[0]); |
| 94 |
< |
close(p1[1]); |
| 95 |
< |
pd->r = p1[0]; |
| 96 |
< |
pd->w = p0[1]; |
| 93 |
> |
/* connect parent's streams */ |
| 94 |
> |
if (!(pd->flags & PF_FILT_INP)) { |
| 95 |
> |
close(p0[0]); |
| 96 |
> |
pd->r = p1[0]; |
| 97 |
> |
} else if (p1[0] != pd->r) { |
| 98 |
> |
if (dup2(p1[0], pd->r) < 0) |
| 99 |
> |
return(-1); |
| 100 |
> |
close(p1[0]); |
| 101 |
> |
} |
| 102 |
> |
if (!(pd->flags & PF_FILT_OUT)) { |
| 103 |
> |
close(p1[1]); |
| 104 |
> |
pd->w = p0[1]; |
| 105 |
> |
} else if (p0[1] != pd->w) { |
| 106 |
> |
if (dup2(p0[1], pd->w) < 0) |
| 107 |
> |
return(-1); |
| 108 |
> |
close(p0[1]); |
| 109 |
> |
} |
| 110 |
|
/* |
| 111 |
|
* Close write stream on exec to avoid multiprocessing deadlock. |
| 112 |
|
* No use in read stream without it, so set flag there as well. |
| 113 |
|
* GW: This bug took me two days to figure out!! |
| 114 |
|
*/ |
| 115 |
< |
fcntl(pd->r, F_SETFD, FD_CLOEXEC); |
| 116 |
< |
fcntl(pd->w, F_SETFD, FD_CLOEXEC); |
| 117 |
< |
pd->running = 1; |
| 115 |
> |
if (pd->r >= 0) |
| 116 |
> |
fcntl(pd->r, F_SETFD, FD_CLOEXEC); |
| 117 |
> |
if (pd->w >= 0) |
| 118 |
> |
fcntl(pd->w, F_SETFD, FD_CLOEXEC); |
| 119 |
> |
pd->flags |= PF_RUNNING; |
| 120 |
|
return(PIPE_BUF); |
| 121 |
|
} |
| 122 |
|
|
| 123 |
|
|
| 124 |
|
int |
| 125 |
|
close_processes( /* close pipes and wait for processes to finish */ |
| 126 |
< |
SUBPROC pd[], |
| 127 |
< |
int nproc |
| 126 |
> |
SUBPROC pd[], |
| 127 |
> |
int nproc |
| 128 |
|
) |
| 129 |
|
{ |
| 130 |
|
int togo = nproc; |
| 133 |
|
int i; |
| 134 |
|
|
| 135 |
|
for (i = 0; i < nproc; i++) /* close pipes, first */ |
| 136 |
< |
if (pd[i].running) { |
| 136 |
> |
if (pd[i].flags & PF_RUNNING) { |
| 137 |
|
close(pd[i].w); |
| 138 |
|
close(pd[i].r); |
| 139 |
< |
pd[i].running = 0; |
| 139 |
> |
pd[i].flags &= ~PF_RUNNING; |
| 140 |
|
} else |
| 141 |
|
togo -= (pd[i].pid < 0); |
| 142 |
|
if (nproc == 1) { /* await specific process? */ |
| 143 |
+ |
status = 0; |
| 144 |
|
if (waitpid(pd->pid, &status, 0) != pd->pid) |
| 145 |
|
return(-1); |
| 146 |
< |
pd->pid = -1; |
| 146 |
> |
*pd = sp_inactive; |
| 147 |
|
return(status>>8 & 0xff); |
| 148 |
|
} |
| 149 |
|
/* else unordered wait */ |
| 150 |
|
while (togo > 0 && (pid = wait(&status)) >= 0) { |
| 151 |
|
for (i = nproc; i-- > 0; ) |
| 152 |
|
if (pd[i].pid == pid) { |
| 153 |
< |
pd[i].pid = -1; |
| 153 |
> |
pd[i] = sp_inactive; |
| 154 |
|
--togo; |
| 155 |
|
break; |
| 156 |
|
} |
