From 0df3ef4435beda2711abcb992fae1969398b9a7c Mon Sep 17 00:00:00 2001
From: Christopher Berner <me@cberner.com>
Date: Tue, 12 Nov 2024 20:02:47 -0800
Subject: Fix compilation error on Solaris due to flock usage

PR 130999 added the file_lock feature, but libc does not define
flock() for the Solaris platform leading to a compilation error.

Additionally, I went through all the Tier 2 platforms and read through
their documentation to see whether flock was implemented. This turned up
5 more Unix platforms where flock is not supported, even though it may
exist in the libc crate.
---
 library/std/src/sys/pal/unix/fs.rs | 80 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

(limited to 'library/std/src/sys')

diff --git a/library/std/src/sys/pal/unix/fs.rs b/library/std/src/sys/pal/unix/fs.rs
index be2363862ee..96f99efb21e 100644
--- a/library/std/src/sys/pal/unix/fs.rs
+++ b/library/std/src/sys/pal/unix/fs.rs
@@ -1254,16 +1254,54 @@ impl File {
         }
     }
 
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    ))]
     pub fn lock(&self) -> io::Result<()> {
         cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_EX) })?;
         return Ok(());
     }
 
+    #[cfg(not(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    )))]
+    pub fn lock(&self) -> io::Result<()> {
+        Err(io::const_io_error!(io::ErrorKind::Unsupported, "lock() not supported"))
+    }
+
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    ))]
     pub fn lock_shared(&self) -> io::Result<()> {
         cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_SH) })?;
         return Ok(());
     }
 
+    #[cfg(not(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    )))]
+    pub fn lock_shared(&self) -> io::Result<()> {
+        Err(io::const_io_error!(io::ErrorKind::Unsupported, "lock_shared() not supported"))
+    }
+
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    ))]
     pub fn try_lock(&self) -> io::Result<bool> {
         let result = cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_EX | libc::LOCK_NB) });
         if let Err(ref err) = result {
@@ -1275,6 +1313,22 @@ impl File {
         return Ok(true);
     }
 
+    #[cfg(not(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    )))]
+    pub fn try_lock(&self) -> io::Result<bool> {
+        Err(io::const_io_error!(io::ErrorKind::Unsupported, "try_lock() not supported"))
+    }
+
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    ))]
     pub fn try_lock_shared(&self) -> io::Result<bool> {
         let result = cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_SH | libc::LOCK_NB) });
         if let Err(ref err) = result {
@@ -1286,11 +1340,37 @@ impl File {
         return Ok(true);
     }
 
+    #[cfg(not(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    )))]
+    pub fn try_lock_shared(&self) -> io::Result<bool> {
+        Err(io::const_io_error!(io::ErrorKind::Unsupported, "try_lock_shared() not supported"))
+    }
+
+    #[cfg(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    ))]
     pub fn unlock(&self) -> io::Result<()> {
         cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_UN) })?;
         return Ok(());
     }
 
+    #[cfg(not(any(
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_vendor = "apple",
+    )))]
+    pub fn unlock(&self) -> io::Result<()> {
+        Err(io::const_io_error!(io::ErrorKind::Unsupported, "unlock() not supported"))
+    }
+
     pub fn truncate(&self, size: u64) -> io::Result<()> {
         let size: off64_t =
             size.try_into().map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))?;
-- 
cgit 1.4.1-3-g733a5