mmap_trunc_core.c
avg (Andriy Gapon)
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	avg
	Jan 20 2017, 12:58 PM

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868 B

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mmap_trunc_core.c
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	#include <sys/types.h>
	#include <sys/mman.h>
	#include <sys/stat.h>

	#include <fcntl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>

	static const int SIZE = 4096;

	int main (int argc, char *argv[])
	{
	char *p;
	int fd;

	if (argc < 2) {
	fprintf (stderr, "usage: %s <file>\n", argv[0]);
	return (1);
	}

	fd = open(argv[1], O_CREAT \| O_EXCL \| O_RDWR, 0660);
	if (fd == -1) {
	perror ("open");
	return (1);
	}
	unlink(argv[1]);

	if (ftruncate(fd, SIZE) == -1) {
	perror ("ftruncate");
	return (1);
	}

	p = mmap(NULL, 4 * SIZE, PROT_READ \| PROT_WRITE, MAP_SHARED, fd, 0);
	if (p == MAP_FAILED) {
	perror ("mmap");
	return (1);
	}
	abort();
	}