RFC: fix fcntl support in linux-user - new try
Hi,
This is a new try to fix the fcntl support in linux-user. I tried to
adress all comments but as the previous version is several weeks old,
it's possible that I've missed some.
This patch doesn't handle linux specific fcntl flags. My plan is to get
this version of the patch reviewed/fixed and then, add them if wanted.
Thanks,
Arnaud
Signed-off-by: Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fdf74e1..41d7dc1 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -3622,6 +3622,44 @@
return ret;
}
+/* warning : doesn't handle linux specific flags... */
+static int target_to_host_fcntl_cmd(int cmd)
+{
+ switch(cmd) {
+ case TARGET_F_DUPFD:
+ case TARGET_F_GETFD:
+ case TARGET_F_SETFD:
+ case TARGET_F_GETFL:
+ case TARGET_F_SETFL:
+ return cmd;
+ case TARGET_F_GETLK:
+ return F_GETLK;
+ case TARGET_F_SETLK:
+ return F_SETLK;
+ case TARGET_F_SETLKW:
+ return F_SETLKW;
+ case TARGET_F_GETOWN:
+ return F_GETOWN;
+ case TARGET_F_SETOWN:
+ return F_SETOWN;
+ case TARGET_F_GETSIG:
+ return F_GETSIG;
+ case TARGET_F_SETSIG:
+ return F_SETSIG;
+#if TARGET_ABI_BITS == 32
+ case TARGET_F_GETLK64:
+ return F_GETLK64;
+ case TARGET_F_SETLK64:
+ return F_SETLK64;
+ case TARGET_F_SETLKW64:
+ return F_SETLKW64;
+#endif
+ default:
+ return -TARGET_EINVAL;
+ }
+ return -TARGET_EINVAL;
+}
+
static abi_long do_fcntl(int fd, int cmd, abi_ulong arg)
{
struct flock fl;
@@ -3629,6 +3667,10 @@
struct flock64 fl64;
struct target_flock64 *target_fl64;
abi_long ret;
+ int host_cmd = target_to_host_fcntl_cmd(cmd);
+
+ if (host_cmd == -TARGET_EINVAL)
+ return host_cmd;
switch(cmd) {
case TARGET_F_GETLK:
@@ -3640,7 +3682,7 @@
fl.l_len = tswapl(target_fl->l_len);
fl.l_pid = tswapl(target_fl->l_pid);
unlock_user_struct(target_fl, arg, 0);
- ret = get_errno(fcntl(fd, cmd, &fl));
+ ret = get_errno(fcntl(fd, host_cmd, &fl));
if (ret == 0) {
if (!lock_user_struct(VERIFY_WRITE, target_fl, arg, 0))
return -TARGET_EFAULT;
@@ -3663,7 +3705,7 @@
fl.l_len = tswapl(target_fl->l_len);
fl.l_pid = tswapl(target_fl->l_pid);
unlock_user_struct(target_fl, arg, 0);
- ret = get_errno(fcntl(fd, cmd, &fl));
+ ret = get_errno(fcntl(fd, host_cmd, &fl));
break;
case TARGET_F_GETLK64:
@@ -3675,7 +3717,7 @@
fl64.l_len = tswapl(target_fl64->l_len);
fl64.l_pid = tswap16(target_fl64->l_pid);
unlock_user_struct(target_fl64, arg, 0);
- ret = get_errno(fcntl(fd, cmd >> 1, &fl64));
+ ret = get_errno(fcntl(fd, host_cmd, &fl64));
if (ret == 0) {
if (!lock_user_struct(VERIFY_WRITE, target_fl64, arg, 0))
return -TARGET_EFAULT;
@@ -3697,18 +3739,25 @@
fl64.l_len = tswapl(target_fl64->l_len);
fl64.l_pid = tswap16(target_fl64->l_pid);
unlock_user_struct(target_fl64, arg, 0);
- ret = get_errno(fcntl(fd, cmd >> 1, &fl64));
+ ret = get_errno(fcntl(fd, host_cmd, &fl64));
break;
- case F_GETFL:
- ret = get_errno(fcntl(fd, cmd, arg));
+ case TARGET_F_GETFL:
+ ret = get_errno(fcntl(fd, host_cmd, arg));
if (ret >= 0) {
ret = host_to_target_bitmask(ret, fcntl_flags_tbl);
}
break;
- case F_SETFL:
- ret = get_errno(fcntl(fd, cmd, target_to_host_bitmask(arg, fcntl_flags_tbl)));
+ case TARGET_F_SETFL:
+ ret = get_errno(fcntl(fd, host_cmd, target_to_host_bitmask(arg, fcntl_flags_tbl)));
+ break;
+
+ case TARGET_F_SETOWN:
+ case TARGET_F_GETOWN:
+ case TARGET_F_SETSIG:
+ case TARGET_F_GETSIG:
+ ret = get_errno(fcntl(fd, host_cmd, arg));
break;
default:
@@ -6501,20 +6550,9 @@
struct target_eabi_flock64 *target_efl;
#endif
- switch(arg2){
- case TARGET_F_GETLK64:
- cmd = F_GETLK64;
- break;
- case TARGET_F_SETLK64:
- cmd = F_SETLK64;
- break;
- case TARGET_F_SETLKW64:
- cmd = F_SETLK64;
- break;
- default:
- cmd = arg2;
- break;
- }
+ cmd = target_to_host_fcntl_cmd(arg2);
+ if (cmd == -TARGET_EINVAL)
+ return cmd;
switch(arg2) {
case TARGET_F_GETLK64:
@@ -6594,7 +6632,7 @@
ret = get_errno(fcntl(arg1, cmd, &fl));
break;
default:
- ret = do_fcntl(arg1, cmd, arg3);
+ ret = do_fcntl(arg1, arg2, arg3);
break;
}
break;
