To contents
Next section
However, instead of cloning and then calling open(), you can clone the File with a filename and open mode. This is the same thing as cloning and then calling open, except shorter and faster. Default open mode is "r" and default mask is 0666.
Alternatively, you can clone a File with "stdin", "stdout" or "stderr" as argument. This will open the specified standard stream.
For the advanced users, you can use the file descriptors of the systems (note: emulated by pike on some systems - like NT). This is only useful for streaming purposes on unix systems. This is not recommended at all if you don't know what you're into. Default mode for this is "rw".
| 'r' | open file for reading |
| 'w' | open file for writing |
| 'a' | open file for append (use with 'w') |
| 't' | truncate file at open (use with 'w') |
| 'c' | create file if it doesn't exist (use with 'w') |
| 'x' | fail if file already exist (use with 'c') |
How should _always_ contain at least one of 'r' or 'w'.
The third argument is protection bits if the file is created. Default is 0666 (all read+write, in octal notation).
If a one is given as second argument to read(), read will not try its best to read as many bytes as you asked it to read, it will merely try to read as many bytes as the system read function will return. This mainly useful with stream devices which can return exactly one row or packet at a time.
If no arguments are given, read will read to the end of the file/stream.
If a one is given as a second argument to read_oob(), only as many bytes of out-of-band data as are currently available will be returned.
If no arguments are given, read_oob will read to the end of the stream.
It is not guaranteed that all out-of-band data sent from the other end will be received. Most streams only allow for a single byte of out-of-band data at a time.
It is not guaranteed that all out-of-band data will be received at the other end. Most streams only allow for a single byte of out-of-band data at a time. Some streams will send the rest of the data as ordinary data.
When out-of-band data arrives on the stream, read_oob_callback will be called with some or all of this data. When the stream allows out-of-band data to be sent, write_oob_callback is called so that you can write out-of-band data to it.
All callbacks will have the id of file as first argument when called.
If no arguments are given, the callbacks are not changed. The stream is just set to nonblocking mode.
/* Redirect stdin to come from the file 'foo' */
object o=Stdio.File();
o->open("foo","r");
o->dup2(Stdio.File("stdin"));
If you give a port number to this function, the socket will be bound to this port locally before connecting anywhere. This is only useful for some silly protocols like FTP. You may also specify an address to bind to if your machine has many IP numbers.
This function returns 1 for success, 0 otherwise. Note that if the socket is in nonblocking mode, you have to wait for a write or close callback before you know if the connection failed or not.
Here is an example of how to use the TCP functions in Stdio.File in blocking mode. This short program takes a URL as first argument, connects to the WWW server, sends a HEAD request and writes the reply to stdout. For clarity, all calls to Stdio.File use File:: even if that is not strictly necessary.
import Stdio;
inherit File;
int main(int argc, array(string) argv)
{
string host;
string path="";
int port=80;
sscanf(argv[1],"http://%s",argv[1]);
sscanf(argv[1],"%s/%s",host,path);
sscanf(host,"%s:%d",host,port);
if(!File::open_socket())
{
perror("Open socket failed");
exit(1);
}
if(!File::connect(host,port))
{
perror("Failed to connect to remote host");
exit(1);
}
File::write(sprintf("HEAD /%s HTTP/1.0\n",path));
stdout::write(File::read());
}
To contents
Next section