From 675c47f1b376c2e65a6130c0f0ceab53cbb90556 Mon Sep 17 00:00:00 2001
From: Marian Ohligs <ohligs@lfbs.rwth-aachen.de>
Date: Wed, 28 Sep 2011 00:10:54 +0200
Subject: [PATCH] add basic support for syscall stat

---
 include/metalsvm/fs.h | 24 ++++++++++++++++++++++++
 kernel/syscall.c      | 35 +++++++++++++++++++++++++++++++----
 2 files changed, 55 insertions(+), 4 deletions(-)

diff --git a/include/metalsvm/fs.h b/include/metalsvm/fs.h
index b281c8be..59e3eaa4 100644
--- a/include/metalsvm/fs.h
+++ b/include/metalsvm/fs.h
@@ -165,6 +165,30 @@ typedef struct {
 	char entries[MAX_DATAENTRIES];
 } data_block_t;
 
+
+/* Time Value Specification Structures, P1003.1b-1993, p. 261 */
+struct timespec {
+  long	  tv_sec;   /* Seconds */
+  long    tv_nsec;  /* Nanoseconds */
+};
+
+struct stat 
+{
+	uint16_t		st_dev;		/* ID of device containing file */
+	uint16_t		st_ino;		/* inode number */
+	uint32_t		st_mode;	/* protection */
+	unsigned short	st_nlink;	/* number of hard links */
+	uint16_t		st_uid;		/* user ID of owner */
+	uint16_t		st_gid;		/* group ID of owner */
+	uint16_t		st_rdev;	/* device ID (if special file) */
+	off_t		st_size;	/* total size, in bytes */
+	struct timespec st_atim;	/* time of last access */
+	struct timespec st_mtim;	/* time of last modification */
+	struct timespec st_ctim;	/* time of last status change */
+	uint32_t	st_blksize;	/* blocksize for filesystem I/O */
+	uint32_t	st_blocks;	/* number of blocks allocated */
+} stat_t;
+
 extern vfs_node_t* fs_root;	// The root of the filesystem.
 
 /** @defgroup fsfunc FS related functions
diff --git a/kernel/syscall.c b/kernel/syscall.c
index f2d25d8c..cf956ecf 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -98,6 +98,33 @@ static int sys_dup(int fd)
 	return new_fd;
 }
 
+static int sys_stat(const char* name, struct stat* st) {
+	vfs_node_t* node;
+
+	node = findnode_fs(name);
+	if (node == NULL)
+		return -EINVAL;
+
+	st->st_dev = 0; 		/* ID of device containing file */
+	st->st_ino = 0;		/* inode number */
+	st->st_mode = node->mask;	/* protection */
+	st->st_nlink = 0;		/* number of hard links */
+	st->st_uid = node->uid;		/* user ID of owner */
+	st->st_gid = node->gid;		/* group ID of owner */
+	st->st_rdev = node->type;	/* device ID (if special file) */
+	st->st_size = (node->block_size / MAX_DATAENTRIES + 1) * MAX_DATAENTRIES;	/* total size, in bytes */
+	st->st_blksize = node->block_size;	/* blocksize for filesystem I/O */
+	st->st_blocks = node->block_size / MAX_DATAENTRIES + 1;		/* number of blocks allocated */
+	st->st_atim.tv_sec = 0;		/* time of last access */
+	st->st_atim.tv_nsec = 0;
+	st->st_mtim.tv_sec = 0;		/* time of last modification */
+	st->st_mtim.tv_nsec = 0;
+	st->st_ctim.tv_sec = 0;		/* time of last status change */
+	st->st_ctim.tv_nsec = 0;
+
+	return 0;
+}
+
 #if defined(CONFIG_LWIP) && LWIP_SOCKET
 static int sys_socket(int domain, int type, int protocol)
 {
@@ -267,10 +294,10 @@ int syscall_handler(uint32_t sys_nr, ...)
 			break;
 		}
 	case __NR_stat: {
-			//const char* name = va_arg(vl, const char*);
-			//struct stat* st = va_arg(vl, struct stat*);
-
-			ret = -EINVAL;
+			const char* name = va_arg(vl, const char*);
+			struct stat* st = va_arg(vl, struct stat*);
+	
+			ret = sys_stat(name, st);
 			break;
 		}
 	case __NR_read: {