From 2dfecbfa898c7db2f5039c81c23a8475966ecfef Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Thu, 26 May 2022 21:45:34 +0200
Subject: syscalls/memflag: FINDFREE flag

---
 src/shared/syscalls.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/shared/syscalls.h')

diff --git a/src/shared/syscalls.h b/src/shared/syscalls.h
index 8dee783..5d98429 100644
--- a/src/shared/syscalls.h
+++ b/src/shared/syscalls.h
@@ -66,4 +66,13 @@ struct fs_wait_response {
 int _syscall_fs_wait(char __user *buf, int max_len, struct fs_wait_response __user *res);
 int _syscall_fs_respond(char __user *buf, int ret);
 
-int _syscall_memflag(void __user *addr, size_t len, int flags);
+/** Modifies the virtual address space.
+ *
+ * If the MEMFLAG_PRESENT flag is present - mark the memory region as allocated.
+ * Otherwise, free it.
+ *
+ * MEMFLAG_FINDFREE tries to find the first free region of length `len`.
+ *
+ * @return address of the first affected page (usually == addr)
+ */
+void __user *_syscall_memflag(void __user *addr, size_t len, int flags);
-- 
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