Unix System Calls - open, read, write, close, exit

// Unix system calls

// open, read, write, close system calls

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h> 

#include <fcntl.h>    

int main (int argc, char *argv[])

{

        int fd;

        int n_char=0;

              char buffer[10];

        fd=open(argv[1],O_RDONLY);

        if (fd==-1)

        {

                   printf("File open error.");

                   exit(1);

        }

       

        while( (n_char=read(fd, buffer, 1))!=0)

                   n_char=write(1,buffer,n_char);

       

        close(fd)

        return 0;

}