Kernel, libc: Rename gettid() to getpid() and move it to unistd.h

apps/src/init.c

@@ -42,9 +42,9 @@ int print_version()
 
 int main()
 {
-    if (gettid() == 0) // why are we the idle task?
+    if (getpid() != 1)
     {
-        fprintf(stderr, "SHENANIGANS! init is tid 0 (which is reserved for the idle task)\n");
+        fprintf(stderr, "init should be started as PID 1\n");
         return 1;
     }
 
@@ -67,7 +67,7 @@ int main()
 
     printf("Welcome to Luna!\n");
 
-    printf("Running as PID %ld\n\n", gettid());
+    printf("Running as PID %ld\n\n", getpid());
 
     sleep(1);
 

kernel/include/sys/Syscall.h

@@ -7,7 +7,7 @@
 #define SYS_sleep 2
 #define SYS_write 3
 #define SYS_paint 4
-#define SYS_gettid 5
+#define SYS_getpid 5
 #define SYS_mmap 6
 #define SYS_munmap 7
 #define SYS_open 8
@@ -33,7 +33,7 @@ void sys_yield(Context* context);
 void sys_sleep(Context* context, uint64_t ms);
 void sys_write(Context* context, int fd, size_t size, const char* addr);
 void sys_paint(Context* context, uint64_t x, uint64_t y, uint64_t w, uint64_t h, uint64_t col);
-void sys_gettid(Context* context);
+void sys_getpid(Context* context);
 void sys_mmap(Context* context, void* address, size_t size, int prot);
 void sys_munmap(Context* context, void* address, size_t size);
 void sys_open(Context* context, const char* filename, int flags);

kernel/src/sys/Syscall.cpp

@@ -16,7 +16,7 @@ void Syscall::entry(Context* context)
     case SYS_sleep: sys_sleep(context, context->rdi); break;
     case SYS_write: sys_write(context, (int)context->rdi, context->rsi, (const char*)context->rdx); break;
     case SYS_paint: sys_paint(context, context->rdi, context->rsi, context->rdx, context->r10, context->r8); break;
-    case SYS_gettid: sys_gettid(context); break;
+    case SYS_getpid: sys_getpid(context); break;
     case SYS_mmap: sys_mmap(context, (void*)context->rdi, context->rsi, (int)context->rdx); break;
     case SYS_munmap: sys_munmap(context, (void*)context->rdi, context->rsi); break;
     case SYS_open: sys_open(context, (const char*)context->rdi, (int)context->rsi); break;

kernel/src/sys/sched.cpp

@@ -20,7 +20,7 @@ void sys_sleep(Context* context, uint64_t ms)
     Scheduler::task_yield(context);
 }
 
-void sys_gettid(Context* context)
+void sys_getpid(Context* context)
 {
     context->rax = Scheduler::current_task()->id;
 }

libs/libc/include/luna.h

@@ -9,9 +9,6 @@ extern "C"
 {
 #endif
 
-    /* Returns the current program's thread identifier. */
-    pid_t gettid(void);
-
     /* Sleeps for ms milliseconds. */
     unsigned int msleep(unsigned int ms);
 

libs/libc/include/luna/syscall.h

@@ -6,7 +6,7 @@
 #define SYS_sleep 2
 #define SYS_write 3
 #define SYS_paint 4
-#define SYS_gettid 5
+#define SYS_getpid 5
 #define SYS_mmap 6
 #define SYS_munmap 7
 #define SYS_open 8

libs/libc/include/unistd.h

@@ -27,6 +27,9 @@ extern "C"
      * the parent. */
     pid_t fork(void);
 
+    /* Returns the current process's process ID. */
+    pid_t getpid(void);
+
     /* Terminates the program with the status code status. */
     __lc_noreturn void _exit(int status);
 

libs/libc/src/luna.cpp

@@ -7,11 +7,6 @@
 
 extern "C"
 {
-    pid_t gettid()
-    {
-        return syscall(SYS_gettid);
-    }
-
     unsigned int msleep(unsigned int ms)
     {
         return (unsigned int)syscall(SYS_sleep, ms);

libs/libc/src/unistd.cpp

@@ -25,6 +25,11 @@ extern "C"
         return syscall(SYS_fork);
     }
 
+    pid_t getpid(void)
+    {
+        return syscall(SYS_getpid);
+    }
+
     long syscall(long number, ...)
     {
         typedef unsigned long int arg;
@@ -36,7 +41,7 @@ extern "C"
         case SYS_clock:
         case SYS_yield:
         case SYS_fork:
-        case SYS_gettid: result = __luna_syscall0(number); break;
+        case SYS_getpid: result = __luna_syscall0(number); break;
         case SYS_exit:
         case SYS_close:
         case SYS_exec: