On Sun, 14 Nov 2010, Ed Schouten wrote:
> Author: ed
> Date: Sun Nov 14 18:42:39 2010
> New Revision: 215310
> URL: http://svn.freebsd.org/changeset/base/215310
> 
> Log:
>   Always set errno to a sane value when pututxline(3) fails.
>   
>   For example, it will now return ESRCH when trying to replace a
>   nonexistent entry with DEAD_PROCESS.
> 
> Modified:
>   head/lib/libc/gen/pututxline.c
> 
> Modified: head/lib/libc/gen/pututxline.c
> ==============================================================================
> --- head/lib/libc/gen/pututxline.c    Sun Nov 14 18:24:12 2010        
> (r215309)
> +++ head/lib/libc/gen/pututxline.c    Sun Nov 14 18:42:39 2010        
> (r215310)
> @@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
>  #include <sys/endian.h>
>  #include <sys/stat.h>
>  #include <sys/uio.h>
> +#include <errno.h>
>  #include <fcntl.h>
>  #include <stdio.h>
>  #include <string.h>
> @@ -53,6 +54,7 @@ futx_open(const char *file)
>       /* Safety check: never use broken files. */
>       if (_fstat(fd, &sb) != -1 && sb.st_size % sizeof(struct futx) != 0) {
>               _close(fd);
> +             errno = EINVAL;
>               return (NULL);
>       }

setutxdb(3) returns EFTYPE here, for the same error.  Should this be the 
same?

>       
> @@ -142,6 +144,7 @@ utx_active_remove(struct futx *fu)
>       }
>  
>       fclose(fp);
> +     errno = ESRCH;
>       return (1);
>  }

These possible errors should probably also now be documented in 
pututxline(3).

Gavin
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