From 52d391507d4af2afa16eb492d8a31a44785a1015 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Tue, 18 Oct 2022 17:36:17 +0200
Subject: [PATCH] Kernel: Rename the getpid() syscall to getprocid()

Now, we have one single system call to fetch all sorts of identifiers:
PID, PPID, UID, GID; EUID, EGID, and more...
---
 kernel/include/sys/Syscall.h |  4 ++--
 kernel/src/sys/Syscall.cpp   |  2 +-
 kernel/src/sys/id.cpp        | 24 ++++++++++++++++++++++++
 kernel/src/sys/sched.cpp     |  5 -----
 4 files changed, 27 insertions(+), 8 deletions(-)
 create mode 100644 kernel/src/sys/id.cpp

diff --git a/kernel/include/sys/Syscall.h b/kernel/include/sys/Syscall.h
index b27d2294..934bb342 100644
--- a/kernel/include/sys/Syscall.h
+++ b/kernel/include/sys/Syscall.h
@@ -7,7 +7,7 @@
 #define SYS_sleep 2
 #define SYS_write 3
 #define SYS_paint 4
-#define SYS_getpid 5
+#define SYS_getprocid 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_getpid(Context* context);
+void sys_getprocid(Context* context, int field);
 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);
diff --git a/kernel/src/sys/Syscall.cpp b/kernel/src/sys/Syscall.cpp
index 1ba62e76..44a38774 100644
--- a/kernel/src/sys/Syscall.cpp
+++ b/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_getpid: sys_getpid(context); break;
+    case SYS_getprocid: sys_getprocid(context, (int)context->rdi); 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;
diff --git a/kernel/src/sys/id.cpp b/kernel/src/sys/id.cpp
new file mode 100644
index 00000000..c54c742d
--- /dev/null
+++ b/kernel/src/sys/id.cpp
@@ -0,0 +1,24 @@
+#include "errno.h"
+#include "thread/Scheduler.h"
+
+#define ID_PID 0
+#define ID_PPID 1
+
+void sys_getprocid(Context* context, int field)
+{
+    if (field == ID_PID)
+    {
+        context->rax = Scheduler::current_task()->id;
+        return;
+    }
+    else if (field == ID_PPID)
+    {
+        context->rax = Scheduler::current_task()->ppid;
+        return;
+    }
+    else
+    {
+        context->rax = -EINVAL;
+        return;
+    }
+}
\ No newline at end of file
diff --git a/kernel/src/sys/sched.cpp b/kernel/src/sys/sched.cpp
index c641a3d5..d658263a 100644
--- a/kernel/src/sys/sched.cpp
+++ b/kernel/src/sys/sched.cpp
@@ -18,9 +18,4 @@ void sys_sleep(Context* context, uint64_t ms)
     task->task_sleep = ms;
     task->state = task->Sleeping;
     Scheduler::task_yield(context);
-}
-
-void sys_getpid(Context* context)
-{
-    context->rax = Scheduler::current_task()->id;
 }
\ No newline at end of file