micro-utils/networking/hostname.c

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>

int main(const int argc, const char **argv) {
	if (argv[argc - 1][0] == '-') {
		printf("hostname [hostname Set new hostname]\n");
		return 0;
	}

	/* Set hostname */
	if (argc == 2) {
		if (sethostname(argv[argc - 1], strlen(argv[argc - 1])) < 0) {
			fprintf(stderr, "hostname: %s\n", strerror(errno));
			return 1;
		}

		return 0;
	}

	/* Get info */
	char hostname[HOST_NAME_MAX + 1];
	if (gethostname(hostname, sizeof(hostname)) < 0) {
		fprintf(stderr, "hostname: %s\n", strerror(errno));
		return 1;
	}

	puts(hostname);
	return 0;
}