Add some scheduler API stubs

#461

fs/dir.c

@@ -34,8 +34,6 @@ struct linux_dirent64_ {
     char name[];
 } __attribute__((packed));
 
-#define MAX_RECLEN sizeof(struct linux_dirent64_) + NAME_MAX + 
-
 size_t fill_dirent_32(void *dirent_data, ino_t inode, off_t_ offset, const char *name, int type) {
     struct linux_dirent_ *dirent = dirent_data;
     dirent->inode = inode;

kernel/calls.c

@@ -98,6 +98,9 @@ syscall_t syscall_table[] = {
     [147] = (syscall_t) sys_getsid,
     [148] = (syscall_t) sys_fsync, // fdatasync
     [150] = (syscall_t) sys_mlock,
+    [155] = (syscall_t) sys_sched_getparam,
+    [156] = (syscall_t) sys_sched_setscheduler,
+    [157] = (syscall_t) sys_sched_getscheduler,
     [158] = (syscall_t) sys_sched_yield,
     [162] = (syscall_t) sys_nanosleep,
     [163] = (syscall_t) sys_mremap,

kernel/resource.c

@@ -217,6 +217,7 @@ int_t sys_sched_setaffinity(pid_t_ UNUSED(pid), dword_t UNUSED(cpusetsize), addr
     // meh
     return 0;
 }
+
 int_t sys_getpriority(int_t which, pid_t_ who) {
     STRACE("getpriority(%d, %d)", which, who);
     return 20;
@@ -225,3 +226,25 @@ int_t sys_setpriority(int_t which, pid_t_ who, int_t prio) {
     STRACE("setpriority(%d, %d, %d)", which, who, prio);
     return 0;
 }
+
+// realtime scheduling stubs
+int_t sys_sched_getparam(pid_t_ UNUSED(pid), addr_t param_addr) {
+    int_t sched_priority = 0;
+    if (user_put(param_addr, sched_priority))
+        return _EFAULT;
+    return 0;
+}
+#define SCHED_OTHER_ 0
+int_t sys_sched_getscheduler(pid_t_ UNUSED(pid)) {
+    return SCHED_OTHER_;
+}
+int_t sys_sched_setscheduler(pid_t_ UNUSED(pid), int_t policy, addr_t param_addr) {
+    if (policy != SCHED_OTHER_)
+        return _EINVAL;
+    int_t sched_priority;
+    if (user_get(param_addr, sched_priority))
+        return _EFAULT;
+    if (sched_priority != 0)
+        return _EINVAL;
+    return 0;
+}

kernel/resource.h

@@ -71,4 +71,8 @@ int_t sys_sched_setaffinity(pid_t_ pid, dword_t cpusetsize, addr_t cpuset_addr);
 int_t sys_getpriority(int_t which, pid_t_ who);
 int_t sys_setpriority(int_t which, pid_t_ who, int_t prio);
 
+int_t sys_sched_getparam(pid_t_ pid, addr_t param_addr);
+int_t sys_sched_getscheduler(pid_t_ UNUSED(pid));
+int_t sys_sched_setscheduler(pid_t_ UNUSED(pid), int_t policy, addr_t param_addr);
+
 #endif