blob: 4ee8b60e9ed67525e984731ef22a324d9f469d79 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
** Copyright 1998 - 1999 Double Precision, Inc.
** See COPYING for distribution information.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <stdio.h>
#include <signal.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include <time.h>
#define INCLUDED_FROM_CONFIGURE
#include "waitlib.c"
#define NUMPROCS 10
static int numterminated=0;
static void cntreaped(pid_t p, int n)
{
if ( ++numterminated == NUMPROCS ) _exit(0);
}
static RETSIGTYPE childsig(int n)
{
n=n;
wait_reap(cntreaped, childsig);
#if RETSIGTYPE != void
return (0);
#endif
}
int main()
{
int pipefd[2];
int pipefd2[2];
pid_t p;
int i;
time_t t;
char c;
if (pipe(pipefd) || pipe(pipefd2))
{
perror("pipe");
exit(1);
}
signal(SIGCHLD, childsig);
for (i=0; i<NUMPROCS; i++)
{
while ((p=fork()) == -1)
{
perror("fork");
sleep(5);
}
if (p == 0)
{
close(pipefd[1]);
close(pipefd2[0]);
close(pipefd2[1]);
read(pipefd[0], &c, 1);
_exit(0);
}
}
close(pipefd2[1]);
close(pipefd[0]);
if (read(pipefd2[0], &c, 1) != 0)
{
perror("read");
}
wait_block();
close(pipefd2[0]);
close(pipefd[1]);
sleep(3);
time(&t);
wait_clear(&childsig);
do
{
sleep(3);
} while ( time(0) < t+3);
if (numterminated == NUMPROCS)
exit(0);
exit(1);
return (0);
}
|
