adding environmental variables support

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@304 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/defines.h

@@ -14,4 +14,6 @@
 
 #define SYS_THREAD_ARG_LENGTH_MAX 255
 
+#define SYS_THREAD_STRING_LENGTH_MAX 2048
+
 #endif

headers/private/kernel/kernel.h

@@ -36,7 +36,10 @@ extern "C" {
  * Size of the stack given to processes
  */
 #define STACK_SIZE  (PAGE_SIZE*16)
-
+/**
+ * Size of the environmental variables space for a process
+ */
+#define ENV_SIZE    (PAGE_SIZE*8)
 
 #define ROUNDUP(a, b) (((a) + ((b)-1)) & ~((b)-1))
 #define ROUNDOWN(a, b) (((a) / (b)) * (b))

headers/private/kernel/ksyscalls.h

@@ -86,7 +86,9 @@ enum {
 	SYSCALL_READ_DIR,
 	SYSCALL_REWIND_DIR,
 	SYSCALL_OPEN_DIR,
-	SYSCALL_CREATE_DIR
+	SYSCALL_CREATE_DIR,
+	SYSCALL_SETENV,
+	SYSCALL_GETENV /* 80 */
 };
 
 int syscall_dispatcher(unsigned long call_num, void *arg_buffer, uint64 *call_ret);

headers/private/kernel/thread.h

@@ -48,7 +48,7 @@ thread_id thread_create_user_thread(char *name, proc_id pid, addr entry, void *a
 thread_id thread_create_kernel_thread(const char *name, int (*func)(void *args), void *args);
 
 struct proc *proc_get_kernel_proc(void);
-proc_id proc_create_proc(const char *path, const char *name, char **args, int argc, int priority);
+proc_id proc_create_proc(const char *path, const char *name, char **args, int argc, char **envp, int envc, int priority);
 int proc_kill_proc(proc_id);
 int proc_wait_on_proc(proc_id id, int *retcode);
 proc_id proc_get_kernel_proc_id(void);
@@ -58,7 +58,7 @@ int user_proc_get_arg_count(void);
 
 // used in syscalls.c
 int user_thread_wait_on_thread(thread_id id, int *uretcode);
-proc_id user_proc_create_proc(const char *path, const char *name, char **args, int argc, int priority);
+proc_id user_proc_create_proc(const char *path, const char *name, char **args, int argc, char **envp, int envc, int priority);
 int user_proc_wait_on_proc(proc_id id, int *uretcode);
 
 thread_id user_thread_create_user_thread(addr, proc_id, const char*, 
@@ -69,6 +69,9 @@ int user_proc_get_table(struct proc_info *pi, size_t len);
 int user_getrlimit(int resource, struct rlimit * rlp);
 int user_setrlimit(int resource, const struct rlimit * rlp);
 
+int user_setenv(const char *name, const char *value, int overwrite);
+int user_getenv(const char *name, char **value);
+
 #if 1
 // XXX remove later
 int thread_test(void);

headers/private/kernel/unistd.h

@@ -39,6 +39,8 @@ extern	 int optind;
 extern	 int optopt;
 extern	 int optreset;
 
+extern   char **environ;
+
 off_t   lseek(int, off_t, int);
 ssize_t read(int, void *, size_t);
 ssize_t pread(int, void *, size_t, off_t);