git: sbin/hammer: Change fprintf/exit to err variants [1/2]

[Tomohiro Kusumi]

commit bac217f3427aaf2d01616d8630b4d8e05a865bfd
Author: Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
Date:   Fri Dec 16 00:17:19 2016 +0900

    sbin/hammer: Change fprintf/exit to err variants [1/2]
    
    Change
    fprintf(stderr, ...); exit(1);
    and
    perror(...); exit(1);
    to
    err(1, ...) or errx(1, ...);
    where possible for consistency.
    
    In test_volume(), if open(2)/pread(2) failed, err(1) without
    scanning rest of the volumes. This function itself is redundant
    anyway as mentioned in 1e297b34, so no one cares.
    
    Other than that this is just conversion to err(3) variants.
    Messages themselves are not changed, except for removing
    strerror(errno) for err(3), and removing trailing \n,
    though err variants add program name in the messages.
    
    err(3) and variants are non standard BSD functions, but HAMMER
    userspace has been using BSD stuff aside from the existing
    err/errx. Also note that err(3) is available in Linux as well.

Summary of changes:
 sbin/mount_hammer/mount_hammer.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/bac217f3427aaf2d01616d8630b4d8e05a865bfd


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