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sysread function
Fixed-length unbuffered input from a filehandle
sysread FILEHANDLE,SCALAR,LENGTH,OFFSET
sysread FILEHANDLE,SCALAR,LENGTH
Attempts to read LENGTH bytes of data into variable SCALAR from
the specified FILEHANDLE, using the system call read(2). It bypasses stdio,
so mixing this with other kinds of reads, print(), write(), seek(), or tell() can cause confusion because stdio usually buffers
data. Returns the number of bytes actually read, 0 at end of file, or undef if there was an error.
SCALAR will be grown or shrunk so that the last byte actually read is the last byte of the
scalar after the read.
An OFFSET may be specified to place the read data at some place in the string other than
the beginning. A negative OFFSET specifies placement at that many bytes
counting backwards from the end of the string. A positive OFFSET greater
than the length of SCALAR results in the string being padded to the required size with "\0"
bytes before the result of the read is appended.
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