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linux-user: add tee, splice and vmsplice 

Add support for tee, splice and vmsplice.

Originally from: vibi sreenivasan <vibi_sreenivasan@cms.com>

Riku: squashed patches together, added a test to configure
and removed compliler warning by picking up correct type for
splice param

Signed-off-by: vibisreenivasan <vibi_sreenivasan@cms.com>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
This commit is contained in:
vibisreenivasan 2009-05-16 18:32:41 +05:30 committed by Riku Voipio
parent 099d6b0fe9
commit 3ce34dfb42
2 changed files with 63 additions and 0 deletions
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23
configure vendored
View File

@ -1322,6 +1322,26 @@ if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
pipe2=yes
fi
# check if tee/splice is there. vmsplice was added same time.
splice=no
cat > $TMPC << EOF
#define _GNU_SOURCE
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
int main(void)
{
int len, fd;
len = tee(STDIN_FILENO, STDOUT_FILENO, INT_MAX, SPLICE_F_NONBLOCK);
splice(STDIN_FILENO, NULL, fd, NULL, len, SPLICE_F_MOVE);
return 0;
}
EOF
if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
splice=yes
fi
# Check if tools are available to build documentation.
if test "$build_docs" = "yes" -a \( ! -x "`which texi2html 2>/dev/null`" -o ! -x "`which pod2man 2>/dev/null`" \) ; then
build_docs="no"
@ -1725,6 +1745,9 @@ fi
if test "$pipe2" = "yes" ; then
echo "#define CONFIG_PIPE2 1" >> $config_h
fi
if test "$splice" = "yes" ; then
echo "#define CONFIG_SPLICE 1" >> $config_h
fi
if test "$inotify" = "yes" ; then
echo "#define CONFIG_INOTIFY 1" >> $config_h
fi

40
linux-user/syscall.c
View File

@ -6865,6 +6865,46 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
break;
#endif
#ifdef CONFIG_SPLICE
#ifdef TARGET_NR_tee
case TARGET_NR_tee:
{
ret = get_errno(tee(arg1,arg2,arg3,arg4));
}
break;
#endif
#ifdef TARGET_NR_splice
case TARGET_NR_splice:
{
loff_t loff_in, loff_out;
loff_t *ploff_in = NULL, *ploff_out = NULL;
if(arg2) {
get_user_u64(loff_in, arg2);
ploff_in = &loff_in;
}
if(arg4) {
get_user_u64(loff_out, arg2);
ploff_out = &loff_out;
}
ret = get_errno(splice(arg1, ploff_in, arg3, ploff_out, arg5, arg6));
}
break;
#endif
#ifdef TARGET_NR_vmsplice
case TARGET_NR_vmsplice:
{
int count = arg3;
struct iovec *vec;
vec = alloca(count * sizeof(struct iovec));
if (lock_iovec(VERIFY_READ, vec, arg2, count, 1) < 0)
goto efault;
ret = get_errno(vmsplice(arg1, vec, count, arg4));
unlock_iovec(vec, arg2, count, 0);
}
break;
#endif
#endif /* CONFIG_SPLICE */
default:
unimplemented:
gemu_log("qemu: Unsupported syscall: %d\n", num);