From 67e666762e60080ee85b750220db4664d691fea2 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sat, 18 Oct 2025 16:44:36 -0400
Subject: kern: filedesc: Expose fd allocation API

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/os/filedesc.h | 24 ++++++++++++++++++++++++
 src/sys/os/os_filedes.c       | 22 ++++------------------
 2 files changed, 28 insertions(+), 18 deletions(-)

diff --git a/src/sys/include/os/filedesc.h b/src/sys/include/os/filedesc.h
index b773de9..95400ed 100644
--- a/src/sys/include/os/filedesc.h
+++ b/src/sys/include/os/filedesc.h
@@ -51,6 +51,18 @@ struct filedesc {
     mode_t mode;
 };
 
+/*
+ * Allocate a file descriptor from a specific process's
+ * file descriptor table
+ *
+ * @procp: Process to allocate fd from
+ * @fd_res: Result pointer is written here
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value upon failure
+ */
+int fd_alloc(struct proc *procp, struct filedesc **fd_res);
+
 /*
  * Duplicate a file descriptor
  *
@@ -62,6 +74,18 @@ struct filedesc {
  */
 struct filedesc *fd_dup(struct proc *procp, int fd);
 
+/*
+ * Look up a file descriptor that belongs to a specific
+ * process by using its fd number
+ *
+ * @procp: Process to look up
+ * @fd: File descriptor number
+ *
+ * Returns the file descriptor pointer on success,
+ * otherwise a less than zero value on failure
+ */
+struct filedesc *fd_get(struct proc *procp, int fd);
+
 /*
  * Initialize a process file descriptor table
  * and set up standard streams
diff --git a/src/sys/os/os_filedes.c b/src/sys/os/os_filedes.c
index 36748a6..3eaee0d 100644
--- a/src/sys/os/os_filedes.c
+++ b/src/sys/os/os_filedes.c
@@ -44,16 +44,9 @@
 #define STDOUT_FILENO 1
 
 /*
- * Allocate a file descriptor from a specific process's
- * file descriptor table
- *
- * @procp: Process to allocate fd from
- * @fd_res: Result pointer is written here
- *
- * Returns zero on success, otherwise a less than
- * zero value upon failure
+ * Allocate a file descriptor
  */
-static int
+int
 fd_alloc(struct proc *procp, struct filedesc **fd_res)
 {
     struct filedesc *fd;
@@ -91,16 +84,9 @@ fd_alloc(struct proc *procp, struct filedesc **fd_res)
 }
 
 /*
- * Look up a file descriptor that belongs to a specific
- * process by using its fd number
- *
- * @procp: Process to look up
- * @fd: File descriptor number
- *
- * Returns the file descriptor pointer on success,
- * otherwise a less than zero value on failure
+ * Get a file descriptor
  */
-static struct filedesc *
+struct filedesc *
 fd_get(struct proc *procp, int fd)
 {
     struct filedesc *fdp;
-- 
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