发信人: saka.bbs@bbs.neu.edu.cn (机器猫), 信区: cnlinux
标 题: perl(32)
发信站: 白山黑水BBS (Wed Apr 2 17:46:03 1997)
转信站: Lilac!ustcnews!ustcnews!sjtunews!neubbs
出 处: conger.neu.edu.cn
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NAME
sysread - fixed-length unbuffered input from a filehandle
---------------------------------------------------------------------------
SYNOPSIS
sysread FILEHANDLE,SCALAR,LENGTH,OFFSET
sysread FILEHANDLE,SCALAR,LENGTH
---------------------------------------------------------------------------
DESCRIPTION
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 may cause confusion. Returns the
number of bytes actually read, or undef if there was an error. SCALAR will
be grown or shrunk to the length actually read. An OFFSET may be specified
to place the read data at some other place than the beginning of the
string.
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