[PATCH v2 2/2] linux-user: call set/getscheduler set/getparam directly

[Tonis Tiigi]

There seems to be difference in syscall and libc definition of these
methods and therefore musl does not implement them (1e21e78bf7). Call
syscall directly to ensure the behavior of the libc of user application,
not the libc that was used to build QEMU.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 linux-user/syscall.c      | 40 ++++++++++++++++++++++++++-------------
 linux-user/syscall_defs.h |  4 ++++
 2 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index a447ce1f92..6adecf745a 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -345,6 +345,17 @@ _syscall4(int, sys_sched_getattr, pid_t, pid, struct 
target_sched_attr *, attr,
 #define __NR_sys_sched_setattr __NR_sched_setattr
 _syscall3(int, sys_sched_setattr, pid_t, pid, struct target_sched_attr *, attr,
           unsigned int, flags);
+#define __NR_sys_sched_getscheduler __NR_sched_getscheduler
+_syscall1(int, sys_sched_getscheduler, pid_t, pid);
+#define __NR_sys_sched_setscheduler __NR_sched_setscheduler
+_syscall3(int, sys_sched_setscheduler, pid_t, pid, int, policy,
+          const struct target_sched_param *, param);
+#define __NR_sys_sched_getparam __NR_sched_getparam
+_syscall2(int, sys_sched_getparam, pid_t, pid,
+          struct target_sched_param *, param);
+#define __NR_sys_sched_setparam __NR_sched_setparam
+_syscall2(int, sys_sched_setparam, pid_t, pid,
+          const struct target_sched_param *, param);
 #define __NR_sys_getcpu __NR_getcpu
 _syscall3(int, sys_getcpu, unsigned *, cpu, unsigned *, node, void *, tcache);
 _syscall4(int, reboot, int, magic1, int, magic2, unsigned int, cmd,
@@ -10555,30 +10566,32 @@ static abi_long do_syscall1(void *cpu_env, int num, 
abi_long arg1,
         return ret;
     case TARGET_NR_sched_setparam:
         {
-            struct sched_param *target_schp;
-            struct sched_param schp;
+            struct target_sched_param *target_schp;
+            struct target_sched_param schp;
 
             if (arg2 == 0) {
                 return -TARGET_EINVAL;
             }
-            if (!lock_user_struct(VERIFY_READ, target_schp, arg2, 1))
+            if (!lock_user_struct(VERIFY_READ, target_schp, arg2, 1)) {
                 return -TARGET_EFAULT;
+            }
             schp.sched_priority = tswap32(target_schp->sched_priority);
             unlock_user_struct(target_schp, arg2, 0);
-            return get_errno(sched_setparam(arg1, &schp));
+            return get_errno(sys_sched_setparam(arg1, &schp));
         }
     case TARGET_NR_sched_getparam:
         {
-            struct sched_param *target_schp;
-            struct sched_param schp;
+            struct target_sched_param *target_schp;
+            struct target_sched_param schp;
 
             if (arg2 == 0) {
                 return -TARGET_EINVAL;
             }
-            ret = get_errno(sched_getparam(arg1, &schp));
+            ret = get_errno(sys_sched_getparam(arg1, &schp));
             if (!is_error(ret)) {
-                if (!lock_user_struct(VERIFY_WRITE, target_schp, arg2, 0))
+                if (!lock_user_struct(VERIFY_WRITE, target_schp, arg2, 0)) {
                     return -TARGET_EFAULT;
+                }
                 target_schp->sched_priority = tswap32(schp.sched_priority);
                 unlock_user_struct(target_schp, arg2, 1);
             }
@@ -10586,19 +10599,20 @@ static abi_long do_syscall1(void *cpu_env, int num, 
abi_long arg1,
         return ret;
     case TARGET_NR_sched_setscheduler:
         {
-            struct sched_param *target_schp;
-            struct sched_param schp;
+            struct target_sched_param *target_schp;
+            struct target_sched_param schp;
             if (arg3 == 0) {
                 return -TARGET_EINVAL;
             }
-            if (!lock_user_struct(VERIFY_READ, target_schp, arg3, 1))
+            if (!lock_user_struct(VERIFY_READ, target_schp, arg3, 1)) {
                 return -TARGET_EFAULT;
+            }
             schp.sched_priority = tswap32(target_schp->sched_priority);
             unlock_user_struct(target_schp, arg3, 0);
-            return get_errno(sched_setscheduler(arg1, arg2, &schp));
+            return get_errno(sys_sched_setscheduler(arg1, arg2, &schp));
         }
     case TARGET_NR_sched_getscheduler:
-        return get_errno(sched_getscheduler(arg1));
+        return get_errno(sys_sched_getscheduler(arg1));
     case TARGET_NR_sched_getattr:
         {
             struct target_sched_attr *target_scha;
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 310d6ce8ad..28b9fe9a47 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2928,4 +2928,8 @@ struct target_sched_attr {
     abi_uint sched_util_max;
 };
 
+struct target_sched_param {
+    abi_int sched_priority;
+};
+
 #endif
-- 
2.32.0 (Apple Git-132)