sysopen

sysopen 
filehandle
, 
filename
, 
mode
, [
perms
]

Opens the file given by filename and associates it with filehandle . This function calls open(2) with the parameters filename , mode , and perms .

The possible values and flag bits of the mode parameter are system-dependent; they are available via the Fcntl library module. However, for historical reasons, some values are universal: zero means read-only, one means write-only, and two means read/write.

If the file named by filename does not exist, and sysopen creates it (typically because mode includes the O_CREAT flag), then the value of perms specifies the permissions of the newly created file. If perms is omitted, the default value is 0666 , which allows read and write for all. This default is reasonable: see umask .

The FileHandle module provides a more object-oriented approach to sysopen . See also open .