Update hold_lock_file_for_append and copy_fd to return a meaningful errno
on failure.
Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
copy.c | 20 +++++++++++++-------
lockfile.c | 7 ++++++-
2 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/copy.c b/copy.c
index a7f58fd..5cb8679 100644
--- a/copy.c
+++ b/copy.c
@@ -9,10 +9,12 @@ int copy_fd(int ifd, int ofd)
if (!len)
break;
if (len < 0) {
- int read_error = errno;
+ int save_errno = errno;
close(ifd);
- return error("copy-fd: read returned %s",
- strerror(read_error));
+ error("copy-fd: read returned %s",
+ strerror(save_errno));
+ errno = save_errno;
+ return -1;
}
while (len) {
int written = xwrite(ofd, buf, len);
@@ -22,12 +24,16 @@ int copy_fd(int ifd, int ofd)
}
else if (!written) {
close(ifd);
- return error("copy-fd: write returned 0");
+ error("copy-fd: write returned 0");
+ errno = EAGAIN;
+ return -1;
} else {
- int write_error = errno;
+ int save_errno = errno;
close(ifd);
- return error("copy-fd: write returned %s",
- strerror(write_error));
+ error("copy-fd: write returned %s",
+ strerror(save_errno));
+ errno = save_errno;
+ return -1;
}
}
}
diff --git a/lockfile.c b/lockfile.c
index a921d77..32f4681 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -217,15 +217,20 @@ int hold_lock_file_for_append(struct lock_file *lk, const
char *path, int flags)
orig_fd = open(path, O_RDONLY);
if (orig_fd < 0) {
if (errno != ENOENT) {
+ int save_errno = errno;
if (flags & LOCK_DIE_ON_ERROR)
die("cannot open '%s' for copying", path);
close(fd);
- return error("cannot open '%s' for copying", path);
+ error("cannot open '%s' for copying", path);
+ errno = save_errno;
+ return -1;
}
} else if (copy_fd(orig_fd, fd)) {
+ int save_errno = errno;
if (flags & LOCK_DIE_ON_ERROR)
exit(128);
close(fd);
+ errno = save_errno;
return -1;
}
return fd;
--
2.0.0.467.g08c0633
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