Linux: show the memory map of current process

show-maps.c

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main (void)
{
	int fd, fail;
	ssize_t nread, nwritten;
	size_t acc;
	char buffer[1024];

	fd = open("/proc/self/maps", O_RDONLY);
	if (fd < 0) {
		perror("open");
		return EXIT_FAILURE;
	}

	while ((nread = read(fd, buffer, sizeof(buffer))) > 0)
	{
		fail = 0;

		for (acc = 0; acc < sizeof(buffer) && acc < nread; ) {
			nwritten = write(STDOUT_FILENO, buffer + acc, nread - acc);
			if (nwritten <= 0)
			{
				fail = 1;
				break;
			}

			acc += nwritten;
		}

		if (fail)
		{
			if (nwritten < 0)
			{
				perror("write");
				close(fd);
				return EXIT_FAILURE;
			}
			break;
		}
	}

	close(fd);
	return EXIT_SUCCESS;
}