On 06/17/2014 05:53 PM, Ronnie Sahlberg wrote:
> Making errno when returning from lock_file() meaningful, which should
> fix
>
> * an existing almost-bug in lock_ref_sha1_basic where it assumes
> errno==ENOENT is meaningful and could waste some work on retries
>
> * an existing bug in repack_without_refs where it prints
> strerror(errno) and picks advice based on errno, despite errno
> potentially being zero and potentially having been clobbered by
> that point
>
> Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
> ---
> lockfile.c | 17 ++++++++++++-----
> refs.c | 1 +
> refs.h | 1 +
> 3 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/lockfile.c b/lockfile.c
> index 464031b..a921d77 100644
> --- a/lockfile.c
> +++ b/lockfile.c
> @@ -121,7 +121,7 @@ static char *resolve_symlink(char *p, size_t s)
> return p;
> }
>
> -
> +/* Make sure errno contains a meaningful value on error */
> static int lock_file(struct lock_file *lk, const char *path, int flags)
> {
> /*
> @@ -130,8 +130,10 @@ static int lock_file(struct lock_file *lk, const char
> *path, int flags)
> */
> static const size_t max_path_len = sizeof(lk->filename) - 5;
>
> - if (strlen(path) >= max_path_len)
> + if (strlen(path) >= max_path_len) {
> + errno = ENAMETOOLONG;
> return -1;
> + }
> strcpy(lk->filename, path);
> if (!(flags & LOCK_NODEREF))
> resolve_symlink(lk->filename, max_path_len);
> @@ -148,9 +150,13 @@ static int lock_file(struct lock_file *lk, const char
> *path, int flags)
> lock_file_list = lk;
> lk->on_list = 1;
> }
> - if (adjust_shared_perm(lk->filename))
> - return error("cannot fix permission bits on %s",
> - lk->filename);
> + if (adjust_shared_perm(lk->filename)) {
> + int save_errno = errno;
> + error("cannot fix permission bits on %s",
> + lk->filename);
> + errno = save_errno;
> + return -1;
> + }
Wouldn't it make sense for error() to save and restore errno instead of
scattering the save/restore code around everywhere? I saw the same type
of code about three commits later, too.
> [...]
Michael
--
Michael Haggerty
mhag...@alum.mit.edu
http://softwareswirl.blogspot.com/
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