sysman.c
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sysman.c
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	/* "sysman" client */
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/socket.h>
	#include <sys/uio.h>
	#include <sys/un.h>
	#include <sys/time.h>
	#include <sys/ioctl.h>
	#include <sys/utsname.h>
	#include <netinet/in.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <signal.h>
	#include <unistd.h>
	#include <fcntl.h>

	#define LOCAL_SOCKNAME "/var/run/sysman"
	static int open_local_sock(void);

	int main(int argc, char *argv[])
	{
	char message[PIPE_BUF];
	int local_sock;
	int len;

	if (argc < 2)
	{
	printf("usage: sysman \"command\"\n");
	return 0;
	}

	local_sock = open_local_sock();
	if (local_sock < 0)
	exit(2);

	/* Send the command */
	write(local_sock, argv[1], strlen(argv[1])+1);

	/* Print the replies */
	while ( (len = read(local_sock, message, sizeof(message))) )
	{
	write(STDOUT_FILENO, message, len);
	}
	printf("\n");
	return 0;
	}


	static int open_local_sock(void)
	{
	int local_socket;
	struct sockaddr_un sockaddr;

	// Open local socket
	local_socket = socket(PF_UNIX, SOCK_STREAM, 0);
	if (local_socket < 0)
	{
	perror("Can't create local socket");
	return -1;
	}

	strcpy(sockaddr.sun_path, LOCAL_SOCKNAME);
	sockaddr.sun_family = AF_UNIX;
	if (connect(local_socket, (struct sockaddr *)&sockaddr, sizeof(sockaddr)))
	{
	fprintf(stderr, "sysmand is not running\n");
	close(local_socket);
	return -1;
	}
	return local_socket;
	}