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1 | #include <stdio.h> |
2 | #include <signal.h> | |
ea394d88 | 3 | #include <errno.h> |
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4 | #define tst(a,b) (*mode == 'r'? (b) : (a)) |
5 | #define RDR 0 | |
6 | #define WTR 1 | |
7 | static int popen_pid[20]; | |
cb9e16fc | 8 | static char *sccsid = "@(#)popen.c 1.4 %G%"; |
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9 | |
10 | # ifndef VMUNIX | |
11 | # define vfork fork | |
12 | # endif VMUNIX | |
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13 | |
14 | FILE * | |
15 | popen(cmd,mode) | |
16 | char *cmd; | |
17 | char *mode; | |
18 | { | |
19 | int p[2]; | |
20 | register myside, hisside, pid; | |
21 | ||
22 | if(pipe(p) < 0) | |
23 | return NULL; | |
24 | myside = tst(p[WTR], p[RDR]); | |
25 | hisside = tst(p[RDR], p[WTR]); | |
26 | if((pid = vfork()) == 0) { | |
27 | /* myside and hisside reverse roles in child */ | |
cb9e16fc | 28 | sigchild(); |
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29 | close(myside); |
30 | dup2(hisside, tst(0, 1)); | |
31 | close(hisside); | |
32 | execl("/bin/csh", "sh", "-c", cmd, 0); | |
33 | _exit(1); | |
34 | } | |
35 | if(pid == -1) | |
36 | return NULL; | |
37 | popen_pid[myside] = pid; | |
38 | close(hisside); | |
39 | return(fdopen(myside, mode)); | |
40 | } | |
41 | ||
42 | pclose(ptr) | |
43 | FILE *ptr; | |
44 | { | |
39c234be | 45 | register f, r; |
e343f97a | 46 | int status; |
ea394d88 | 47 | extern int errno; |
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48 | |
49 | f = fileno(ptr); | |
50 | fclose(ptr); | |
ea394d88 | 51 | # ifdef VMUNIX |
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52 | sighold(SIGINT); |
53 | sighold(SIGQUIT); | |
54 | sighold(SIGHUP); | |
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55 | # endif VMUNIX |
56 | while((r = wait(&status)) != popen_pid[f] && r != -1 && errno != EINTR) | |
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57 | ; |
58 | if(r == -1) | |
59 | status = -1; | |
ea394d88 | 60 | # ifdef VMUNIX |
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61 | sigrelse(SIGINT); |
62 | sigrelse(SIGQUIT); | |
63 | sigrelse(SIGHUP); | |
ea394d88 | 64 | # endif VMUNIX |
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65 | return(status); |
66 | } |