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authorGerd Hoffmann <kraxel@redhat.com>2009-04-02 19:59:23 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 22:05:08 -0400
commitf3554f4bc69803ac2baaf7cf2aa4339e1f4b693e (patch)
tree52505043de254dc3e34dad7110724fcc1f489eb9 /arch/x86/include/asm/unistd_32.h
parent6949a6318e60aeb9c755679ac7f978aefe8c1722 (diff)
preadv/pwritev: Add preadv and pwritev system calls.
This patch adds preadv and pwritev system calls. These syscalls are a pretty straightforward combination of pread and readv (same for write). They are quite useful for doing vectored I/O in threaded applications. Using lseek+readv instead opens race windows you'll have to plug with locking. Other systems have such system calls too, for example NetBSD, check here: http://www.daemon-systems.org/man/preadv.2.html The application-visible interface provided by glibc should look like this to be compatible to the existing implementations in the *BSD family: ssize_t preadv(int d, const struct iovec *iov, int iovcnt, off_t offset); ssize_t pwritev(int d, const struct iovec *iov, int iovcnt, off_t offset); This prototype has one problem though: On 32bit archs is the (64bit) offset argument unaligned, which the syscall ABI of several archs doesn't allow to do. At least s390 needs a wrapper in glibc to handle this. As we'll need a wrappers in glibc anyway I've decided to push problem to glibc entriely and use a syscall prototype which works without arch-specific wrappers inside the kernel: The offset argument is explicitly splitted into two 32bit values. The patch sports the actual system call implementation and the windup in the x86 system call tables. Other archs follow as separate patches. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <linux-api@vger.kernel.org> Cc: <linux-arch@vger.kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/include/asm/unistd_32.h')
-rw-r--r--arch/x86/include/asm/unistd_32.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/unistd_32.h b/arch/x86/include/asm/unistd_32.h
index f2bba78430a4..6e72d74cf8dc 100644
--- a/arch/x86/include/asm/unistd_32.h
+++ b/arch/x86/include/asm/unistd_32.h
@@ -338,6 +338,8 @@
338#define __NR_dup3 330 338#define __NR_dup3 330
339#define __NR_pipe2 331 339#define __NR_pipe2 331
340#define __NR_inotify_init1 332 340#define __NR_inotify_init1 332
341#define __NR_preadv 333
342#define __NR_pwritev 334
341 343
342#ifdef __KERNEL__ 344#ifdef __KERNEL__
343 345