The linux-user getpriority() syscall goes through the libc wrapper.
This causes a problem because the libc wrapper remaps the return value
from the kernel. This patch calls the kernel getpriority syscall
directly.
Index: qemu/linux-user/syscall.c
===================================================================
--- qemu.orig/linux-user/syscall.c 2007-09-26 13:13:40.000000000 -0600
+++ qemu/linux-user/syscall.c 2007-09-26 14:10:29.000000000 -0600
@@ -174,6 +174,7 @@
#define __NR_sys_getcwd1 __NR_getcwd
#define __NR_sys_getdents __NR_getdents
#define __NR_sys_getdents64 __NR_getdents64
+#define __NR_sys_getpriority __NR_getpriority
#define __NR_sys_linkat __NR_linkat
#define __NR_sys_mkdirat __NR_mkdirat
#define __NR_sys_mknodat __NR_mknodat
@@ -229,6 +230,7 @@
#if defined(TARGET_NR_getdents64) && defined(__NR_getdents64)
_syscall3(int, sys_getdents64, uint, fd, struct dirent64 *, dirp, uint, count);
#endif
+_syscall2(int, sys_getpriority, int, which, int, who);
_syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
#if defined(TARGET_NR_linkat) && defined(__NR_linkat)
@@ -4010,7 +4012,10 @@
break;
#endif
case TARGET_NR_getpriority:
- ret = get_errno(getpriority(arg1, arg2));
+ /* libc does special remapping of the return value of
+ * sys_getpriority() so it's just easiest to call
+ * sys_getpriority() directly rather than through libc. */
+ ret = sys_getpriority(arg1, arg2);
break;
case TARGET_NR_setpriority:
ret = get_errno(setpriority(arg1, arg2, arg3));
