#include<stdio.h>#include<fcntl.h>#include<sys/stat.h>#include<string.h>void main(){	int fd=open("./shwrfile",O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR|S_IXUSR);	char *c="hello world!\n";	printf("sizeof(c):%d\n",sizeof(c));	write( fd , c , strlen(c) );	printf("%d",S_IWUSR|S_IRUSR);}