From c92cfd95be35df604345c96974b92665d2881acd Mon Sep 17 00:00:00 2001
From: jewelcodes <omarmelghoul01@gmail.com>
Date: Sat, 5 Oct 2024 23:39:16 -0400
Subject: [PATCH] procfs: implemented stat()

---
 fs/procfs/src/include/procfs/procfs.h |  2 ++
 fs/procfs/src/io.c                    | 25 +++++++++++++++++++++++++
 fs/procfs/src/main.c                  | 16 +++++++++++++---
 3 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/fs/procfs/src/include/procfs/procfs.h b/fs/procfs/src/include/procfs/procfs.h
index b9f906e..cdc1d1b 100644
--- a/fs/procfs/src/include/procfs/procfs.h
+++ b/fs/procfs/src/include/procfs/procfs.h
@@ -34,6 +34,8 @@
 
 #define RESOLVE_DIRECTORY           0x10000
 
+extern SysInfoResponse *sysinfo;
+
 void procfsMount(MountCommand *);
 void procfsStat(StatCommand *);
 void procfsOpen(OpenCommand *);
diff --git a/fs/procfs/src/io.c b/fs/procfs/src/io.c
index 4490867..f9a8ebc 100644
--- a/fs/procfs/src/io.c
+++ b/fs/procfs/src/io.c
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include <fnctl.h>
 #include <errno.h>
+#include <sys/stat.h>
 
 void procfsOpen(OpenCommand *ocmd) {
     pid_t pid;
@@ -37,4 +38,28 @@ void procfsOpen(OpenCommand *ocmd) {
         ocmd->header.header.status = 0;
     
     luxSendDependency(ocmd);
+}
+
+void procfsStat(StatCommand *scmd) {
+    scmd->header.header.response = 1;
+    scmd->header.header.length = sizeof(StatCommand);
+
+    pid_t pid;
+    int res = resolve(scmd->path, &pid);
+    if(res < 0) {
+        scmd->header.header.status = -ENOENT;
+        luxSendDependency(scmd);
+        return;
+    }
+
+    scmd->header.header.status = 0;
+
+    memset(&scmd->buffer, 0, sizeof(struct stat));
+    scmd->buffer.st_mode = S_IRUSR | S_IRGRP | S_IROTH;
+    if(res & RESOLVE_DIRECTORY) scmd->buffer.st_mode |= S_IFDIR;
+
+    if(res == RESOLVE_KERNEL) scmd->buffer.st_size = strlen(sysinfo->kernel);
+    else scmd->buffer.st_size = 8;
+
+    luxSendDependency(scmd);
 }
\ No newline at end of file
diff --git a/fs/procfs/src/main.c b/fs/procfs/src/main.c
index 6b1fabf..b37d26c 100644
--- a/fs/procfs/src/main.c
+++ b/fs/procfs/src/main.c
@@ -11,16 +11,25 @@
 #include <string.h>
 #include <stdlib.h>
 
+SysInfoResponse *sysinfo;
+
 int main() {
     luxInit("procfs");
     while(luxConnectDependency("vfs"));     // file system driver
 
     SyscallHeader *req = calloc(1, SERVER_MAX_SIZE);
     SyscallHeader *res = calloc(1, SERVER_MAX_SIZE);
+    sysinfo = calloc(1, sizeof(SysInfoResponse));
+
+    if(!req || !res || !sysinfo) {
+        luxLog(KPRINT_LEVEL_ERROR, "unable to allocate memory for procfs server\n");
+        return -1;
+    }
 
-    if(!req || !res) {
-        luxLog(KPRINT_LEVEL_ERROR, "unable to allocate memory for procfs messages\n");
-        exit(-1);
+    // request kernel info
+    if(luxSysinfo(sysinfo)) {
+        luxLog(KPRINT_LEVEL_ERROR, "failed to acquire kernel sysinfo\n");
+        return -1;
     }
 
     // notify the vfs that this is a file system driver
@@ -54,6 +63,7 @@ int main() {
             switch(req->header.command) {
             case COMMAND_MOUNT: procfsMount((MountCommand *) req); break;
             case COMMAND_OPEN: procfsOpen((OpenCommand *) req); break;
+            case COMMAND_STAT: procfsStat((StatCommand *) req); break;
             default:
                 luxLogf(KPRINT_LEVEL_WARNING, "unimplemented command 0x%X, dropping message...\n", req->header.command);
             }