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syswrite function
Fixed-length unbuffered output to a filehandle
syswrite FILEHANDLE,SCALAR,LENGTH,OFFSET
syswrite FILEHANDLE,SCALAR,LENGTH
Attempts to write LENGTH bytes of data from variable SCALAR to the
specified FILEHANDLE, using the system call write(2). It bypasses stdio, so
mixing this with reads (other than sysread()), print(),
write(), seek(), or tell() may cause confusion
because stdio usually buffers data. Returns the number of bytes actually written, or undef
if there was an error. If the LENGTH is greater than the available data in the SCALAR
after the OFFSET, only as much data as is available will be written.
An OFFSET may be specified to write the data from some part of the string other than the
beginning. A negative OFFSET specifies writing that many bytes counting
backwards from the end of the string. In the case the SCALAR is empty you can use OFFSET
but only zero offset.
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