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sysseek FILEHANDLE,POSITION,WHENCE
Sets FILEHANDLE's system position using the system call lseek(2). It bypasses stdio, so mixing this with reads (other than sysread()), print(), write(), seek(), or tell() may cause confusion.
FILEHANDLE may be an expression whose value gives the name of the filehandle. The values for
WHENCE are 0 to set the new position to
POSITION, 1 to set the it to the current position plus
POSITION, and 2 to set it to
EOF plus
POSITION (typically negative). For
WHENCE, you may use the constants
SEEK_SET,
SEEK_CUR, and
SEEK_END from either the IO::Seekable or the
POSIX module.
Returns the new position, or the undefined value on failure.
A position of zero is returned as the string ``0 but true''; thus sysseek() returns
TRUE on success and
FALSE on failure, yet you can still easily determine the new position.
Source: Perl builtin functions
Copyright: Larry Wall, et al. |
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(Corrections, notes, and links courtesy of RocketAware.com)
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