sysopen
sysopen
sysopen FILEHANDLE,FILENAME,MODE
sysopen FILEHANDLE,FILENAME,MODE,PERMS
Opens the file whose filename is given by FILENAME, and associates it with FILEHANDLE. If FILEHANDLE is an expression, its value is used as the real filehandle wanted; an undefined scalar will be suitably autovivified. This function calls the underlying operating system's open(2) function 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 standard module Fcntl . See the documentation of your operating system's open(2) syscall to see which values and flag bits are available. You may combine several flags using the |-operator.
Some of the most common values are
