diff options
| -rw-r--r-- | src/unistd.rs | 50 |
1 files changed, 30 insertions, 20 deletions
diff --git a/src/unistd.rs b/src/unistd.rs index 47057e34..86cce832 100644 --- a/src/unistd.rs +++ b/src/unistd.rs @@ -737,36 +737,46 @@ pub fn write(fd: RawFd, buf: &[u8]) -> Result<usize> { Errno::result(res).map(|r| r as usize) } +/// Directive that tells [`lseek`] and [`lseek64`] what the offset is relative to. +/// [`lseek`]: ./fn.lseek.html +/// [`lseek64`]: ./fn.lseek64.html +#[repr(i32)] pub enum Whence { - SeekSet, - SeekCur, - SeekEnd, - SeekData, - SeekHole -} - -impl Whence { - fn to_libc_type(&self) -> c_int { - match self { - &Whence::SeekSet => libc::SEEK_SET, - &Whence::SeekCur => libc::SEEK_CUR, - &Whence::SeekEnd => libc::SEEK_END, - &Whence::SeekData => 3, - &Whence::SeekHole => 4 - } - } - + /// Specify an offset relative to the start of the file. + SeekSet = libc::SEEK_SET, + /// Specify an offset relative to the current file location. + SeekCur = libc::SEEK_CUR, + /// Specify an offset relative to the end of the file. + SeekEnd = libc::SEEK_END, + /// Specify an offset relative to the next location in the file greater than or + /// equal to offset that contains some data. If offset points to + /// some data, then the file offset is set to offset. + #[cfg(any(target_os = "dragonfly", target_os = "freebsd", + all(target_os = "linux", not(any(target_env = "musl", + target_arch = "mips", + target_arch = "mips64")))))] + SeekData = libc::SEEK_DATA, + /// Specify an offset relative to the next hole in the file greater than + /// or equal to offset. If offset points into the middle of a hole, then + /// the file offset should be set to offset. If there is no hole past offset, + /// then the file offset should be adjusted to the end of the file (i.e., there + /// is an implicit hole at the end of any file). + #[cfg(any(target_os = "dragonfly", target_os = "freebsd", + all(target_os = "linux", not(any(target_env = "musl", + target_arch = "mips", + target_arch = "mips64")))))] + SeekHole = libc::SEEK_HOLE } pub fn lseek(fd: RawFd, offset: libc::off_t, whence: Whence) -> Result<libc::off_t> { - let res = unsafe { libc::lseek(fd, offset, whence.to_libc_type()) }; + let res = unsafe { libc::lseek(fd, offset, whence as i32) }; Errno::result(res).map(|r| r as libc::off_t) } #[cfg(any(target_os = "linux", target_os = "android"))] pub fn lseek64(fd: RawFd, offset: libc::off64_t, whence: Whence) -> Result<libc::off64_t> { - let res = unsafe { libc::lseek64(fd, offset, whence.to_libc_type()) }; + let res = unsafe { libc::lseek64(fd, offset, whence as i32) }; Errno::result(res).map(|r| r as libc::off64_t) } |