From: Matthias Kruk <m@m10k.eu>
Date: Thu, 3 Oct 2019 09:39:51 +0000 (+0900)
Subject: Add infrastructure to allocate file descriptors to processes
X-Git-Url: https://git.corax.cc/?a=commitdiff_plain;h=55a010559cf1e4fc23b6378ade251e698807314d;p=corax

Add infrastructure to allocate file descriptors to processes
---

diff --git a/kernel/core/fd.h b/kernel/core/fd.h
new file mode 100644
index 0000000..1d87f6f
--- /dev/null
+++ b/kernel/core/fd.h
@@ -0,0 +1,11 @@
+#ifndef __FD_H
+#define __FD_H
+
+#define FD_VALID (1 << 0)
+
+struct fd {
+	int fd_flags;
+	int fd_socknum;
+};
+
+#endif /* __FD_H */
diff --git a/kernel/core/process.c b/kernel/core/process.c
index bbad28d..06b00c8 100644
--- a/kernel/core/process.c
+++ b/kernel/core/process.c
@@ -6,11 +6,14 @@
 #include <debug.h>
 #include <process.h>
 #include "sched.h"
+#include "fd.h"
 
 struct process {
 	struct pagedir *p_pgdir;
 	struct task    *p_tasks;
 	u32_t          p_privl;
+
+	struct fd      p_fds[16];
 };
 
 extern int sched_enqueue(task_t*);
@@ -54,6 +57,7 @@ int process_create(process_t **dst, u32_t ppl, void *entry)
 		proc->p_tasks->t_kstack = kstack;
 		proc->p_tasks->t_tslice = 50;
 		proc->p_tasks->t_rslice = 50;
+		proc->p_tasks->t_proc = proc;
 
 		if(sched_enqueue(proc->p_tasks) != 0) {
 			PANIC("sched_enqueue() failed for a new task\n");
@@ -93,3 +97,41 @@ int process_switch(process_t *proc)
 
 	return(ret_val);
 }
+
+int process_falloc(process_t *proc, int sock)
+{
+	int ret_val;
+	int i;
+
+	ret_val = -EMFILE;
+
+	for(i = 0; i < (sizeof(proc->p_fds) / sizeof(proc->p_fds[0])); i++) {
+		if(!(proc->p_fds[i].fd_flags & FD_VALID)) {
+			ret_val = i;
+			proc->p_fds[i].fd_socknum = sock;
+			proc->p_fds[i].fd_flags |= FD_VALID;
+			break;
+		}
+	}
+
+	return(ret_val);
+}
+
+int process_ffree(process_t *proc, int fd)
+{
+	int ret_val;
+
+	ret_val = -EINVAL;
+
+	if(fd >= 0 && fd < (sizeof(proc->p_fds) / sizeof(proc->p_fds[0]))) {
+		ret_val = -EBADF;
+
+		if(proc->p_fds[fd].fd_flags & FD_VALID) {
+			proc->p_fds[fd].fd_flags = 0;
+			proc->p_fds[fd].fd_socknum = -1;
+			ret_val = 0;
+		}
+	}
+
+	return(ret_val);
+}
diff --git a/kernel/include/process.h b/kernel/include/process.h
index c201180..3b1e566 100644
--- a/kernel/include/process.h
+++ b/kernel/include/process.h
@@ -26,4 +26,7 @@ typedef struct process process_t;
 int process_create(process_t**, u32_t, void*);
 int process_switch(process_t*);
 
+int process_falloc(process_t*, int);
+int process_ffree(process_t*, int);
+
 #endif /* __PROCESS_H */