feat: Fix no_std error for last_os_error() when libc is not available e.g. embedded targets

Ilhan Raja · Ilhan Raja · commit 3e7755a55cf4 · 2026-04-21T12:01:56.000-07:00
diff --git a/crates/libafl_bolts/src/os.rs b/crates/libafl_bolts/src/os.rs
@@ -89,6 +89,7 @@ pub fn last_os_error() -> i32 {
     )
 ))]
 pub fn last_os_error() -> i32 {
+    #[cfg(unix)]
     unsafe {
         #[cfg(target_os = "linux")]
         {
@@ -109,6 +110,12 @@ pub fn last_os_error() -> i32 {
             *libc::__error()
         }
     }
+
+    // Fallback for no_std without unix
+    #[cfg(not(unix))]
+    {
+        0
+    }
 }
 
 /// Waits for a pid and returns the status

Original file line number	Diff line number	Diff line change
`@@ -89,6 +89,7 @@ pub fn last_os_error() -> i32 {`
`89`	`89`	`)`
`90`	`90`	`))]`
`91`	`91`	`pub fn last_os_error() -> i32 {`
	`92`	`+ #[cfg(unix)]`
`92`	`93`	`unsafe {`
`93`	`94`	`#[cfg(target_os = "linux")]`
`94`	`95`	`{`
`@@ -109,6 +110,12 @@ pub fn last_os_error() -> i32 {`
`109`	`110`	`*libc::__error()`
`110`	`111`	`}`
`111`	`112`	`}`
	`113`	`+`
	`114`	`+ // Fallback for no_std without unix`
	`115`	`+ #[cfg(not(unix))]`
	`116`	`+ {`
	`117`	`+ 0`
	`118`	`+ }`
`112`	`119`	`}`
`113`	`120`
`114`	`121`	`/// Waits for a pid and returns the status`