validation of utf-8 strings passed as system call arguments

[<writeonce@midipix.org>]

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

int main (int argc, char * argv[], char * envp[])
{
	char path[] = {0xE0, 0x9F, 0x80, 0x00};
	mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH;

	int fd = open (path, O_WRONLY | O_EXCL | O_CREAT, mode);
	
	if (fd == -1) {
		perror ("open");
		return 2;
	} else {
		printf("It worked! The file descriptor is %d.\n",fd);
	}
	
	return 0;
}