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syswrite - fixed-length unbuffered output to a filehandle |
syswrite - fixed-length unbuffered output to a filehandle
syswrite FILEHANDLE,SCALAR,LENGTH,OFFSET
syswrite FILEHANDLE,SCALAR,LENGTH
syswrite FILEHANDLE,SCALAR
Attempts to write
LENGTH bytes of data from variable
SCALAR to the
specified
FILEHANDLE, using the system call write(2). If
LENGTH
is not specified, writes whole
SCALAR. It bypasses stdio, so mixing
this with reads (other than sysread()), print, write,
seek, tell, or eof 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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syswrite - fixed-length unbuffered output to a filehandle |