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| author | Matt Harden <matth@mindspring.com> | 2008-12-21 22:06:16 -0600 |
|---|---|---|
| committer | Jim Meyering <meyering@redhat.com> | 2008-12-26 10:57:05 +0100 |
| commit | 5c065bb0cb979dff21c474c0ff45b0c9013791d4 (patch) | |
| tree | 4f47a9ffc3e455d145c8e75d49fe962094c1a703 /src | |
| parent | 680afe675159bab05b45ddebfc79eac5f7cd5bc5 (diff) | |
| download | coreutils-5c065bb0cb979dff21c474c0ff45b0c9013791d4.tar.xz | |
dd: add support for opening files in Concurrent I/O (CIO) mode
* src/dd.c (O_CIO): New flag.
* src/dd.c (O_FULLBLOCK): Add O_CIO to the list of flags that
O_FULLBLOCK should be greater than.
* src/dd.c (flags): Give the name "cio" to the new O_CIO flag, mirroring
the treatment of O_DIRECT.
* src/dd.c (usage): Add a description of the new flag when it is available.
* doc/coreutils.text (dd invocation): Describe the new flag.
* NEWS: Mention the new feature.
Diffstat (limited to 'src')
| -rw-r--r-- | src/dd.c | 12 |
1 files changed, 11 insertions, 1 deletions
@@ -66,6 +66,12 @@ static void process_signals (void); # define SIGINFO SIGUSR1 #endif +/* This may belong in GNULIB's fcntl module instead. + Define O_CIO to 0 if it is not supported by this OS. */ +#ifndef O_CIO +# define O_CIO 0 +#endif + #if ! HAVE_FDATASYNC # define fdatasync(fd) (errno = ENOSYS, -1) #endif @@ -264,6 +270,7 @@ enum /* Use a value that is larger than that of any other O_ symbol. */ O_FULLBLOCK = ((MAX (O_APPEND, MAX (O_BINARY, + MAX (O_CIO, MAX (O_DIRECT, MAX (O_DIRECTORY, MAX (O_DSYNC, @@ -272,7 +279,7 @@ enum MAX (O_NOFOLLOW, MAX (O_NOLINKS, MAX (O_NONBLOCK, - MAX (O_SYNC, O_TEXT)))))))))))) << 1) + MAX (O_SYNC, O_TEXT))))))))))))) << 1) }; /* Ensure that we didn't shift it off the end. */ @@ -288,6 +295,7 @@ static struct symbol_value const flags[] = { {"append", O_APPEND}, {"binary", O_BINARY}, + {"cio", O_CIO}, {"direct", O_DIRECT}, {"directory", O_DIRECTORY}, {"dsync", O_DSYNC}, @@ -508,6 +516,8 @@ Each FLAG symbol may be:\n\ \n\ append append mode (makes sense only for output; conv=notrunc suggested)\n\ "), stdout); + if (O_CIO) + fputs (_(" cio use concurrent I/O for data\n"), stdout); if (O_DIRECT) fputs (_(" direct use direct I/O for data\n"), stdout); if (O_DIRECTORY) |