From d818a8d10ea8d39e3a064c7b8b27d2f22b349239 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Sun, 25 Nov 2018 14:38:12 -0700
Subject: [PATCH] Add pwrite
---
src/header/unistd/mod.rs | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/src/header/unistd/mod.rs b/src/header/unistd/mod.rs
index 4573d4d8..c10b0cd2 100644
--- a/src/header/unistd/mod.rs
+++ b/src/header/unistd/mod.rs
@@ -417,14 +417,30 @@ pub extern "C" fn pthread_atfork(
unimplemented!();
}
-// #[no_mangle]
+#[no_mangle]
pub extern "C" fn pwrite(
fildes: c_int,
buf: *const c_void,
nbyte: size_t,
offset: off_t,
) -> ssize_t {
- unimplemented!();
+ //TODO: better pwrite using system calls
+
+ let previous = lseek(fildes, offset, SEEK_SET);
+ if previous == -1 {
+ return -1;
+ }
+
+ let res = write(fildes, buf, nbyte);
+ if res < 0 {
+ return res;
+ }
+
+ if lseek(fildes, previous, SEEK_SET) == -1 {
+ return -1;
+ }
+
+ res
}
#[no_mangle]
--
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