44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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* From
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* [url]http://www.crasseux.com/books/ctutorial/Programming-with-pipes.html[/url]
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* but changed to use fgets() instead of the GNU extension getdelim()
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*/
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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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int main()
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{
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FILE *ps_pipe;
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FILE *grep_pipe;
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int bytes_read;
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char buffer[100]; /* could be anything you want */
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/* Open our two pipes
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ls -a | grep pipe*
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*/
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ps_pipe = popen("/bin/ls -a", "r");
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grep_pipe = popen("/bin/grep 'pipe*'", "w");
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/* Check that pipes are non-null, therefore open */
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if ((!ps_pipe) || (!grep_pipe)) {
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fprintf(stderr, "One or both pipes failed.\n");
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return EXIT_FAILURE;
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}
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bytes_read = 0;
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while (fgets(buffer, sizeof(buffer), ps_pipe)) {
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fprintf(grep_pipe, "%s", buffer);
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bytes_read += strlen(buffer);
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}
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printf("Total bytes read = %d\n", bytes_read);
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/* Close ps_pipe, checking for errors */
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if (pclose(ps_pipe) != 0) {
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fprintf(stderr, "Could not run 'ls', or other error.\n");
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}
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/* Close grep_pipe, cehcking for errors */
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if (pclose(grep_pipe) != 0) {
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fprintf(stderr, "Could not run 'grep', or other error.\n");
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}
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/* Exit! */
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return 0;
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}
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