File Descriptor Operations
These functions operate on I/O streams referred to with file descriptors:
-
close(
fd
)
Closes file descriptor
fd
. Availability: Macintosh, Unix, Windows.This function is intended for low-level I/O and must be applied to a file descriptor as returned by
open()
orpipe()
. To close a file object returned by the built-in functionopen()
, bypopen()
, orfdopen()
, use itsclose()
method.-
dup(
fd
)
Returns a duplicate of file descriptor
fd
. Availability: Macintosh, Unix, Windows.-
dup2(
fd
,
fd2
)
Duplicates file descriptor
fd
tofd2
, closing the latter first if necessary. Availability: Unix, Windows.-
fstat(
fd
)
Returns status for file descriptor
fd
, likestat()
. Availability: Unix, Windows.-
fstatvfs(
fd
)
Returns information about the filesystem containing the file associated with file descriptor
fd
, likestatvfs()
. Availability: Unix.-
ftruncate(
fd,
length
)
Truncates the file corresponding to file descriptor
fd
, so that it islength
bytes in size. Availability: Unix.-
lseek(
fd
,
pos
,
how
)
Sets the current position of file descriptor
fd
to positionpos
, modified byhow
: to set the position relative to the beginning of the file; 1 to set it relative to the current position; and 2 to set it relative to the end of the file. Availability: Macintosh, Unix, Windows.-
open(
file,
flags[,
mode]
)
Opens the file
file
and sets various flags according toflags
and, possibly, its mode according tomode
. The default mode is 0777 (octal), and the currentumask
value ...
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