kern: filedesc: Add close() system call

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 18 insertions, 1 deletions

diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index be351e8..a031872 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -68,6 +68,11 @@ scret_t sys_open(struct syscall_args *scargs);
  */
 scret_t sys_read(struct syscall_args *scargs);
 
+/*
+ * Close a file
+ */
+scret_t sys_close(struct syscall_args *scargs);
+
 #ifdef _NEED_UNIX_SCTAB
 scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_none]   = NULL,
@@ -83,7 +88,8 @@ scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_reboot]  = sys_reboot,
     [SYS_waitpid] = sys_waitpid,
     [SYS_dmsio] = sys_dmsio,
-    [SYS_read] = sys_read
+    [SYS_read] = sys_read,
+    [SYS_close] = sys_close
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/os/filedesc.h b/src/sys/include/os/filedesc.h
index fb899cf..a6a2ac5 100644
--- a/src/sys/include/os/filedesc.h
+++ b/src/sys/include/os/filedesc.h
@@ -84,6 +84,16 @@ int fdtab_init(struct proc *procp);
 int fd_open(const char *path, mode_t mode);
 
 /*
+ * Close a file
+ *
+ * @fd: File descriptor to close
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int fd_close(int fd);
+
+/*
  * Write to a file descriptor
  *
  * @fd: File descriptor to write to
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index 1138029..77b7505 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -57,6 +57,7 @@
 #define SYS_waitpid     0x0C    /* wait for child to exit */
 #define SYS_dmsio       0x0D    /* DMS I/O */
 #define SYS_read        0x0E    /* read a file descriptor */
+#define SYS_close       0x0F    /* close a file */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;