Open() , Read() and Write() UNIX System Call

 #include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <sys/stat.h>

int main()

{

char status_info[256];

int fd;

fd=open("junk.out", O_WRONLY|O_CREAT|O_TRUNC,S_IRWXU);

if(fd==-1)

{

printf("File Could not opened");

return -1;

}

strcpy(status_info,"Welcome To Linux");

write(fd,status_info,sizeof(status_info));

close (fd);

strcpy(status_info,"\0");

fd=open("junk.out", O_RDONLY|O_CREAT);

read (fd, status_info, sizeof (status_info) - 1);

printf("%s",status_info);

}

Output:

   

[telnet29@linux ~]$ ./a.out

  Welcome To Linux