Perl for C Programmers

sysopen (Advanced open)

The sysopen function call gives you greater control over the opening of a file handle. The format of this function call is similar to that of the C open function:

sysopen FILEHANDLE,FILENAME,MODE [, PERMS];

In this case, FILEHANDLE is the file to be opened. The FILENAME is the name of the file to be opened. MODE is open mode. It can be 0 for read, 1 for write, and 2 for read write; however, these values may not work on some operating systems such as Macintosh.

Or you can use the package Fcntl to bring in the symbols O_RDONLY, O_WRONLY, and O_RDWR. This module provides all the flags available on your system. Other flags such as O_APPEND and O_NONBLOCK are available as well.

Finally, if you are creating a file, the PERMS ...