sysreadFILEHANDLE,SCALAR,LENGTH,OFFSETsysreadFILEHANDLE,SCALAR,LENGTH
This function attempts to read
LENGTH
bytes of data
into variable
SCALAR
from the specified
FILEHANDLE
using
read
(2). The function returns the number of bytes
actually read, or 0 at EOF. It returns the undefined value on error.
SCALAR
will be grown or shrunk to the length actually
read. The
OFFSET
, if specified, says where in the
string to start putting the bytes, so that you can read into the middle of a
string that's being used as a buffer. For an example, see
syswrite
. You should be prepared to handle the problems
(like interrupted system calls) that standard I/O normally handles for you.
Also, do not mix calls to
read
and
sysread
on the same filehandle unless you are into
heavy wizardry (and/or pain).
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