diff options
Diffstat (limited to 'Doc/lib/libfuncs.tex')
| -rw-r--r-- | Doc/lib/libfuncs.tex | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex index ab4b03c..2c30c14 100644 --- a/Doc/lib/libfuncs.tex +++ b/Doc/lib/libfuncs.tex @@ -206,10 +206,9 @@ any kind of sequence; the result is always a list. expression. \end{funcdesc} -\begin{funcdesc}{open}{filename\, mode} - % XXXJH xrefs here to Built-in types? +\begin{funcdesc}{open}{filename\, mode\, bufsize} Return a new file object (described earlier under Built-in Types). - The string arguments are the same as for \code{stdio}'s + The first two arguments are the same as for \code{stdio}'s \code{fopen()}: \var{filename} is the file name to be opened, \var{mode} indicates how the file is to be opened: \code{'r'} for reading, \code{'w'} for writing (truncating an existing file), and @@ -219,6 +218,18 @@ any kind of sequence; the result is always a list. between binary and text files, \code{'b'} appended to the mode opens the file in binary mode. If the file cannot be opened, \code{IOError} is raised. +If \var{mode} is omitted, it defaults to \code{'r'}. +The optional \var{bufsize} argument specifies the file's desired +buffer size: 0 means unbuffered, 1 means line buffered, any other +positive value means use a buffer of (approximately) that size. A +negative \var{bufsize} means to use the system default, which is +usually line buffered for for tty devices and fully buffered for other +files.% +\footnote{Specifying a buffer size currently has no effect on systems +that don't have \code{setvbuf()}. The interface to specify the buffer +size is not done using a method that calls \code{setvbuf()}, because +that may dump core when called after any I/O has been performed, and +there's no reliable way to determine whether this is the case.} \end{funcdesc} \begin{funcdesc}{ord}{c} |