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linux-user: implement pipe2 [v3] 

implement pipe2 syscall.

[v2] fix do_pipe on mips and sh4
[v3] use pipe2 to ensure atomicity, but only when it is available.

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
This commit is contained in:
Riku Voipio 2009-05-05 12:10:04 +03:00 committed by Riku Voipio
parent 4b627a236a
commit 099d6b0fe9
2 changed files with 58 additions and 18 deletions
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21
configure vendored
View File

@ -1304,6 +1304,24 @@ if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
utimens=yes
fi
# check if pipe2 is there
pipe2=no
cat > $TMPC << EOF
#define _GNU_SOURCE
#include <unistd.h>
#include <fcntl.h>
int main(void)
{
int pipefd[2];
pipe2(pipefd, O_CLOEXEC);
return 0;
}
EOF
if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
pipe2=yes
fi
# Check if tools are available to build documentation.
if test "$build_docs" = "yes" -a \( ! -x "`which texi2html 2>/dev/null`" -o ! -x "`which pod2man 2>/dev/null`" \) ; then
build_docs="no"
@ -1704,6 +1722,9 @@ fi
if test "$utimens" = "yes" ; then
echo "#define CONFIG_UTIMENSAT 1" >> $config_h
fi
if test "$pipe2" = "yes" ; then
echo "#define CONFIG_PIPE2 1" >> $config_h
fi
if test "$inotify" = "yes" ; then
echo "#define CONFIG_INOTIFY 1" >> $config_h
fi

55
linux-user/syscall.c
View File

@ -944,6 +944,37 @@ static abi_long do_select(int n,
return ret;
}
static abi_long do_pipe2(int host_pipe[], int flags)
{
#ifdef CONFIG_PIPE2
return pipe2(host_pipe, flags);
#else
return -ENOSYS;
#endif
}
static abi_long do_pipe(void *cpu_env, int pipedes, int flags)
{
int host_pipe[2];
abi_long ret;
ret = flags ? do_pipe2(host_pipe, flags) : pipe(host_pipe);
if (is_error(ret))
return get_errno(ret);
#if defined(TARGET_MIPS)
((CPUMIPSState*)cpu_env)->active_tc.gpr[3] = host_pipe[1];
ret = host_pipe[0];
#elif defined(TARGET_SH4)
((CPUSH4State*)cpu_env)->gregs[1] = host_pipe[1];
ret = host_pipe[0];
#else
if (put_user_s32(host_pipe[0], pipedes)
|| put_user_s32(host_pipe[1], pipedes + sizeof(host_pipe[0])))
return -TARGET_EFAULT;
#endif
return get_errno(ret);
}
static inline abi_long target_to_host_ip_mreq(struct ip_mreqn *mreqn,
abi_ulong target_addr,
socklen_t len)
@ -4529,25 +4560,13 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
ret = get_errno(dup(arg1));
break;
case TARGET_NR_pipe:
{
int host_pipe[2];
ret = get_errno(pipe(host_pipe));
if (!is_error(ret)) {
#if defined(TARGET_MIPS)
CPUMIPSState *env = (CPUMIPSState*)cpu_env;
env->active_tc.gpr[3] = host_pipe[1];
ret = host_pipe[0];
#elif defined(TARGET_SH4)
((CPUSH4State*)cpu_env)->gregs[1] = host_pipe[1];
ret = host_pipe[0];
#else
if (put_user_s32(host_pipe[0], arg1)
|| put_user_s32(host_pipe[1], arg1 + sizeof(host_pipe[0])))
goto efault;
#endif
}
}
ret = do_pipe(cpu_env, arg1, 0);
break;
#ifdef TARGET_NR_pipe2
case TARGET_NR_pipe2:
ret = do_pipe(cpu_env, arg1, arg2);
break;
#endif
case TARGET_NR_times:
{
struct target_tms *tmsp;