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Add flock; warn about lockdata system dependency when using fcntl.

This commit is contained in:
Guido van Rossum 1996-06-26 19:20:33 +00:00
parent 164c36b6c3
commit 50ec5c074a
2 changed files with 18 additions and 2 deletions
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10
Doc/lib/libfcntl.tex
View File

@ -36,6 +36,12 @@ The module defines the following functions:
\code{IOCTL}. \code{IOCTL}.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{flock}{fd\, op}
Perform the lock operation \var{op} on file descriptor \var{fd}.
See the Unix manual for details. (On some systems, this function is
emulated using \code{fcntl}.)
\end{funcdesc}
If the library modules \code{FCNTL} or \code{IOCTL} are missing, you If the library modules \code{FCNTL} or \code{IOCTL} are missing, you
can find the opcodes in the C include files \code{sys/fcntl} and can find the opcodes in the C include files \code{sys/fcntl} and
\code{sys/ioctl}. You can create the modules yourself with the h2py \code{sys/ioctl}. You can create the modules yourself with the h2py
@ -57,4 +63,6 @@ rv = fcntl(file.fileno(), FCNTL.F_SETLKW, lockdata)
Note that in the first example the return value variable \code{rv} will Note that in the first example the return value variable \code{rv} will
hold an integer value; in the second example it will hold a string hold an integer value; in the second example it will hold a string
value. value. The structure lay-out for the \var{lockadata} variable is
system dependent -- therefore using the \code{flock()} call may be
better.

10
Doc/libfcntl.tex
View File

@ -36,6 +36,12 @@ The module defines the following functions:
\code{IOCTL}. \code{IOCTL}.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{flock}{fd\, op}
Perform the lock operation \var{op} on file descriptor \var{fd}.
See the Unix manual for details. (On some systems, this function is
emulated using \code{fcntl}.)
\end{funcdesc}
If the library modules \code{FCNTL} or \code{IOCTL} are missing, you If the library modules \code{FCNTL} or \code{IOCTL} are missing, you
can find the opcodes in the C include files \code{sys/fcntl} and can find the opcodes in the C include files \code{sys/fcntl} and
\code{sys/ioctl}. You can create the modules yourself with the h2py \code{sys/ioctl}. You can create the modules yourself with the h2py
@ -57,4 +63,6 @@ rv = fcntl(file.fileno(), FCNTL.F_SETLKW, lockdata)
Note that in the first example the return value variable \code{rv} will Note that in the first example the return value variable \code{rv} will
hold an integer value; in the second example it will hold a string hold an integer value; in the second example it will hold a string
value. value. The structure lay-out for the \var{lockadata} variable is
system dependent -- therefore using the \code{flock()} call may be
better.