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/* Author: Jan Sucan */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "mailslot.h"
#define MAILSLOT_SERVER_NAME "\\\\.\\Mailslot\\yup-comm-server"
#define MAILSLOT_CLIENT_NAME "\\\\.\\Mailslot\\yup-comm-client"
#define MAILSLOT_MAX_MSG_SIZE 400
HANDLE mailslot_server = INVALID_HANDLE_VALUE;
HANDLE mailslot_client = INVALID_HANDLE_VALUE;
void
print_msg(FILE * stream, const char * format, ...)
{
char buf[1024];
va_list args;
va_start(args, format);
vsnprintf(buf, 1024, format, args);
va_end(args);
fprintf(stream, " yup-comm-client: %s%s", (stream == stderr) ? "ERROR: " : "" , buf);
fflush(stream);
}
void
clean_exit(int code)
{
if (mailslot_server != INVALID_HANDLE_VALUE) {
CloseHandle(mailslot_server);
}
exit(code);
}
void
usage(void)
{
printf("Usage: yup-comm-client CMD\n");
printf(" CMD command for yup-comm-server\n");
clean_exit(1);
}
int
main(int argc, char ** argv)
{
if (argc != 2) {
print_msg(stderr, "Missing argument\n");
usage();
} if (strlen(argv[1]) > MAILSLOT_MAX_MSG_SIZE) {
print_msg(stderr, "The command is too long (> 400 characters)\n");
clean_exit(1);
}
if ((mailslot_client = mailslot_create(MAILSLOT_CLIENT_NAME)) == INVALID_HANDLE_VALUE) {
print_msg(stderr, "Cannot create mailslot for receiving reply from the server\n");
clean_exit(1);
}
if ((mailslot_server = mailslot_connect(MAILSLOT_SERVER_NAME)) == INVALID_HANDLE_VALUE) {
print_msg(stderr, "Cannot open server's mailslot\n");
clean_exit(1);
}
if (mailslot_write(mailslot_server, argv[1], strlen(argv[1]) + 1U) != 0) {
print_msg(stderr, "Cannot send command to the server\n");
clean_exit(1);
}
print_msg(stdout, "Waiting for reply from the server ...\n");
char c;
mailslot_read(mailslot_client, &c, sizeof(c));
clean_exit(0);
}
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