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Auto merge of #21287 - alexcrichton:issue-19872, r=huonw

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cc #19872, this may help give some insight
This commit is contained in:
bors 2015-01-20 04:23:28 +00:00
commit 9006c3c0f1
1 changed files with 11 additions and 5 deletions
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16
src/librustdoc/flock.rs
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@ -22,6 +22,7 @@ pub use self::imp::Lock;
mod imp { mod imp {
use std::ffi::CString; use std::ffi::CString;
use libc; use libc;
use std::os as stdos;
#[cfg(target_os = "linux")] #[cfg(target_os = "linux")]
mod os { mod os {
@ -116,7 +117,8 @@ mod imp {
libc::open(buf.as_ptr(), libc::O_RDWR | libc::O_CREAT, libc::open(buf.as_ptr(), libc::O_RDWR | libc::O_CREAT,
libc::S_IRWXU) libc::S_IRWXU)
}; };
assert!(fd > 0); assert!(fd > 0, "failed to open lockfile: [{}] {}",
stdos::errno(), stdos::last_os_error());
let flock = os::flock { let flock = os::flock {
l_start: 0, l_start: 0,
l_len: 0, l_len: 0,
@ -129,8 +131,10 @@ mod imp {
libc::fcntl(fd, os::F_SETLKW, &flock as *const os::flock) libc::fcntl(fd, os::F_SETLKW, &flock as *const os::flock)
}; };
if ret == -1 { if ret == -1 {
let errno = stdos::errno();
unsafe { libc::close(fd); } unsafe { libc::close(fd); }
panic!("could not lock `{}`", p.display()) panic!("could not lock `{}`: [{}] {}", p.display(),
errno, stdos::error_string(errno))
} }
Lock { fd: fd } Lock { fd: fd }
} }
@ -199,7 +203,8 @@ mod imp {
ptr::null_mut()) ptr::null_mut())
}; };
if handle == libc::INVALID_HANDLE_VALUE { if handle == libc::INVALID_HANDLE_VALUE {
panic!("create file error: {}", os::last_os_error()); panic!("create file error: [{}] {}",
os::errno(), os::last_os_error());
} }
let mut overlapped: libc::OVERLAPPED = unsafe { mem::zeroed() }; let mut overlapped: libc::OVERLAPPED = unsafe { mem::zeroed() };
let ret = unsafe { let ret = unsafe {
@ -207,9 +212,10 @@ mod imp {
&mut overlapped) &mut overlapped)
}; };
if ret == 0 { if ret == 0 {
let errno = os::errno();
unsafe { libc::CloseHandle(handle); } unsafe { libc::CloseHandle(handle); }
panic!("could not lock `{}`: {}", p.display(), panic!("could not lock `{}`: [{}] {}", p.display(),
os::last_os_error()) errno, os::error_string(errno));
} }
Lock { handle: handle } Lock { handle: handle }
} }