Attachment 171448 Details for Bug 210288 – test program demonstrating the issue

test program demonstrating the issue

pipedream.c (text/plain), 1.46 KB, created by kwilliams@qnx.com on 2016-06-14 22:07:12 UTC

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Creator: kwilliams@qnx.com

Created: 2016-06-14 22:07:12 UTC

Size: 1.46 KB

patch

obsolete

>/*
> ============================================================================
> Name        : pipedream.c
> Author      : 
> Version     :
> Copyright   : Your copyright notice
> Description : Hello World in C, Ansi-style
> ============================================================================
> */
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <fcntl.h>
>#include <unistd.h>
>
>int filedes[2];
>#define BSIZE 100
>const int bsz = BSIZE;
>char b[BSIZE];
>size_t nbytes;
>
>int main(void) {
>	puts("!!!Hello World!!!"); /* prints !!!Hello World!!! */
>	if (pipe(filedes) == -1) {
>		printf("Crap pipe failed\n");
>		return EXIT_FAILURE;
>	}
>
>	switch(fork()) {
>	case -1:
>		printf("Crap fork failed\n");
>		return EXIT_FAILURE;
>		break;
>	case 0:
>		// child
>		nbytes = read(filedes[0], b, bsz);
>		if (nbytes < 0)
>			printf("Child read failed\n");
>		else
>			printf("Child read OK\n");
>		nbytes = write(filedes[0], b, bsz);
>		if (nbytes < 0)
>			printf("Child write failed\n");
>		else
>			printf("Child write OK fd %d\n", filedes[0]);
>		close(filedes[0]);
>		close(filedes[1]); // deliberately do this late
>		break;
>	default:
>		// parent
>		close(filedes[0]);
>		nbytes = write(filedes[1], b, bsz);
>		if (nbytes < 0)
>			printf("parent write failed\n");
>		else
>			printf("parent write OK fd %d\n", filedes[1]);
>		nbytes = read(filedes[1], b, bsz);
>		if (nbytes < 0)
>			printf("parent read failed\n");
>		else
>			printf("parent read OK\n");
>		close(filedes[0]);
>		close(filedes[1]);
>		break;
>	}
>	return EXIT_SUCCESS;
>}

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Attachments on bug 210288: 171448