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sysseek - position I/O pointer on handle used with sysread and syswrite |
sysseek - position I/O pointer on handle used with sysread and syswrite
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, tell, or eof 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 also use the constants SEEK_SET, SEEK_CUR, and
SEEK_END (start of the file, current position, end of the file)
from the Fcntl 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.
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sysseek - position I/O pointer on handle used with sysread and syswrite |