Add errno

Cargo.toml

@@ -11,4 +11,5 @@ repository = "https://gitlab.com/imp/pager-rs.git"
 version = "0.9.3"
 
 [dependencies]
+errno = "0.1.8"
 libc = "0.2"

src/lib.rs

@@ -38,6 +38,7 @@
 //! will skip initialization. The host application will continue as normal. `Pager::ok()` will
 //! reflect the fact that no Pager is active.
 
+extern crate errno;
 extern crate libc;
 
 mod utils;

src/utils.rs

@@ -3,6 +3,7 @@ use std::ffi::{CString, OsString};
 use std::os::unix::ffi::OsStringExt;
 use std::ptr;
 
+use errno;
 use libc;
 
 fn osstring2cstring(s: &OsString) -> CString {
@@ -22,12 +23,20 @@ pub fn fork() -> libc::pid_t {
 }
 
 pub fn execvp(cmd: &OsString) {
+    // println!("cmd {:?}", cmd);
     let mut args = Vec::with_capacity(2);
     for arg in split_string(cmd) {
+        // println!("arg {:?}", arg);
         args.push(osstring2cstring(&arg).as_ptr())
     }
     args.push(ptr::null());
-    assert!(unsafe { libc::execvp(args[0], args.as_ptr()) } > -1);
+    // println!("args {:?}", args);
+    errno::set_errno(errno::Errno(0));
+    // println!("errno pre {}", errno::errno());
+    // println!("Going to run execvp({:?}, {:?})", args[0], args.as_ptr());
+    unsafe { libc::execvp(args[0], args.as_ptr()) };
+    // println!("errno post {}", errno::errno());
+    assert!(false);
 }
 
 pub fn dup2(fd1: i32, fd2: i32) {