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linux-user: add setns and unshare

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Add support for the setns and unshare syscalls, trivially passed through to
the host. Based on patches by Paul Burton, added configure check.

Signed-off-by: Paul Burton <paul@archlinuxmips.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Riku Voipio 2014-08-12 15:58:57 +03:00
parent ab31cda327
commit 9af5c906d1
3 changed files with 34 additions and 0 deletions
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20
configure vendored
View File

@ -3470,6 +3470,23 @@ if compile_prog "" "" ; then
timerfd=yes
fi
# check for setns and unshare support
setns=no
cat > $TMPC << EOF
#include <sched.h>
int main(void)
{
int ret;
ret = setns(0, 0);
ret = unshare(0);
return ret;
}
EOF
if compile_prog "" "" ; then
setns=yes
fi
# Check if tools are available to build documentation.
if test "$docs" != "no" ; then
if has makeinfo && has pod2man; then
@ -4541,6 +4558,9 @@ fi
if test "$timerfd" = "yes" ; then
echo "CONFIG_TIMERFD=y" >> $config_host_mak
fi
if test "$setns" = "yes" ; then
echo "CONFIG_SETNS=y" >> $config_host_mak
fi
if test "$inotify" = "yes" ; then
echo "CONFIG_INOTIFY=y" >> $config_host_mak
fi

3
linux-user/strace.list
View File

@ -1185,6 +1185,9 @@
#ifdef TARGET_NR_set_mempolicy
{ TARGET_NR_set_mempolicy, "set_mempolicy" , NULL, NULL, NULL },
#endif
#ifdef TARGET_NR_setns
{ TARGET_NR_setns, "setns" , NULL, NULL, NULL },
#endif
#ifdef TARGET_NR_setpgid
{ TARGET_NR_setpgid, "setpgid" , NULL, NULL, NULL },
#endif

11
linux-user/syscall.c
View File

@ -9610,6 +9610,17 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
break;
#endif
#if defined(TARGET_NR_setns) && defined(CONFIG_SETNS)
case TARGET_NR_setns:
ret = get_errno(setns(arg1, arg2));
break;
#endif
#if defined(TARGET_NR_unshare) && defined(CONFIG_SETNS)
case TARGET_NR_unshare:
ret = get_errno(unshare(arg1));
break;
#endif
default:
unimplemented:
gemu_log("qemu: Unsupported syscall: %d\n", num);