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authorMatt Harden <matth@mindspring.com>2008-12-21 22:06:16 -0600
committerJim Meyering <meyering@redhat.com>2008-12-26 10:57:05 +0100
commit5c065bb0cb979dff21c474c0ff45b0c9013791d4 (patch)
tree4f47a9ffc3e455d145c8e75d49fe962094c1a703 /src
parent680afe675159bab05b45ddebfc79eac5f7cd5bc5 (diff)
downloadcoreutils-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.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/dd.c b/src/dd.c
index e54cc14df..763961261 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -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)