Update libc to 0.2.79

This also fixes issues with inconsistent `unsafe` on functions.

Author: joshtriplett

Cargo.lock

@@ -1660,9 +1660,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.77"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
+checksum = "2448f6066e80e3bfc792e9c98bf705b4b0fc6e8ef5b43e5889aff0eaa9c58743"
 dependencies = [
  "rustc-std-workspace-core",
 ]

library/std/Cargo.toml

@@ -16,7 +16,7 @@ cfg-if = { version = "0.1.8", features = ['rustc-dep-of-std'] }
 panic_unwind = { path = "../panic_unwind", optional = true }
 panic_abort = { path = "../panic_abort" }
 core = { path = "../core" }
-libc = { version = "0.2.77", default-features = false, features = ['rustc-dep-of-std'] }
+libc = { version = "0.2.79", default-features = false, features = ['rustc-dep-of-std'] }
 compiler_builtins = { version = "0.1.35" }
 profiler_builtins = { path = "../profiler_builtins", optional = true }
 unwind = { path = "../unwind" }

library/std/src/sys/unix/process/process_unix.rs

@@ -461,39 +461,19 @@ impl ExitStatus {
     }
 
     fn exited(&self) -> bool {
-        // On Linux-like OSes this function is safe, on others it is not. See
-        // libc issue: https://github.com/rust-lang/libc/issues/1888.
-        #[cfg_attr(
-            any(target_os = "linux", target_os = "android", target_os = "emscripten"),
-            allow(unused_unsafe)
-        )]
-        unsafe {
-            libc::WIFEXITED(self.0)
-        }
+        libc::WIFEXITED(self.0)
     }
 
     pub fn success(&self) -> bool {
         self.code() == Some(0)
     }
 
     pub fn code(&self) -> Option<i32> {
-        // On Linux-like OSes this function is safe, on others it is not. See
-        // libc issue: https://github.com/rust-lang/libc/issues/1888.
-        #[cfg_attr(
-            any(target_os = "linux", target_os = "android", target_os = "emscripten"),
-            allow(unused_unsafe)
-        )]
-        if self.exited() { Some(unsafe { libc::WEXITSTATUS(self.0) }) } else { None }
+        if self.exited() { Some(libc::WEXITSTATUS(self.0)) } else { None }
     }
 
     pub fn signal(&self) -> Option<i32> {
-        // On Linux-like OSes this function is safe, on others it is not. See
-        // libc issue: https://github.com/rust-lang/libc/issues/1888.
-        #[cfg_attr(
-            any(target_os = "linux", target_os = "android", target_os = "emscripten"),
-            allow(unused_unsafe)
-        )]
-        if !self.exited() { Some(unsafe { libc::WTERMSIG(self.0) }) } else { None }
+        if !self.exited() { Some(libc::WTERMSIG(self.0)) } else { None }
     }
 }
 

library/unwind/Cargo.toml

@@ -14,7 +14,7 @@ doc = false
 
 [dependencies]
 core = { path = "../core" }
-libc = { version = "0.2.51", features = ['rustc-dep-of-std'], default-features = false }
+libc = { version = "0.2.79", features = ['rustc-dep-of-std'], default-features = false }
 compiler_builtins = "0.1.0"
 cfg-if = "0.1.8"