54 lines
873 B
C
54 lines
873 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#define CHILDBIN "./com-child"
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int main(int argc, char * argv[])
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{
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if (argc < 2) {
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fprintf (stderr, "usage : %s string\n", argv[0]);
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exit (EXIT_FAILURE);
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}
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int in[2], out[2];
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FILE *in_fp, *out_fp;
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pipe(in);
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pipe(out);
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if (fork()) { // PARENT
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close(in[0]);
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close(out[1]);
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write (in[1], argv[1], strlen(argv[1]));
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char buf[BUFSIZ];
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read (out[0], buf, BUFSIZ);
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buf[BUFSIZ-1] = '\0';
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printf ("response : %s\n", buf);
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} else { // CHILD
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close(0);
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close(1);
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dup2(in[0], 0);
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dup2(out[1], 1);
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execv(CHILDBIN, NULL);
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}
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int status;
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wait(&status);
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// do something with the status
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return EXIT_SUCCESS;
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}
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