Commits on Jul 12, 2022

1. SigSet: A new unsafe helper method to create a SigSet from a sigset_t …

   Currently,  the only way to create a `SigSet` from a `sigset_t` object
   is by using pointer casts, like:
   
   ```
   unsafe {
       let sigset = *(&sigset as *const libc::sigset_t as *const SigSet)
   };
   ```
   
   This is un-ergonomic for library creators with interfaces to C.
   So, let's add a new unsafe method that creates a `SigSet` from a
   `libc::sigset_t` object.
   
   We can't implement `From` since converting from `libc::sigset_t` to
   `SigSet` is unsafe, because objects of type `libc::sigset_t` must be
   initialized by calling either `sigemptyset(3)` or `sigfillset(3)`
   before being used. In other case, the results are undefined.
   We can't implement `TryFrom` either, because there is no way to check
   if an object of type `libc::sigset_t` is initialized.
   
   Signed-off-by: German Maglione <gmaglione@redhat.com>

   

   germag committed Jul 12, 2022
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2. SigSet: Add the repr(transparent) attribute …

   This commit adds the `repr(transparent)` attribute to the `SigSet`
   struct, to make sure that its representation is exactly like the
   `sigset_t` struct from C, in all cases.
   
   Signed-off-by: German Maglione <gmaglione@redhat.com>

   

   germag committed Jul 12, 2022
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