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Uses fstat() instead of stat() to get the nanosecond timestamp.

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This commit is contained in:
Andrea Mazzoleni 2014-06-02 11:37:52 +02:00
parent da6c08ef46
commit 0e2d88d9fc
1 changed files with 27 additions and 23 deletions
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50
cmdline/nano.c
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@ -38,6 +38,8 @@ void state_nano(struct snapraid_state* state)
struct snapraid_file* file = j->data;
/* if the file has a zero nanosecond timestamp */
/* note that symbolic links are not in the file list */
/* and then are not processed */
if (file->mtime_nsec == 0) {
char path[PATH_MAX];
struct stat st;
@ -52,15 +54,6 @@ void state_nano(struct snapraid_state* state)
nsec = rand() % 1000000000;
} while (nsec == 0);
/* uses stat to get the present timestamp */
ret = stat(path, &st);
if (ret == -1) {
/* LCOV_EXCL_START */
fprintf(stderr, "Error accessing file '%s'. %s.\n", path, strerror(errno));
continue;
/* LCOV_EXCL_STOP */
}
/* open it */
/* O_NOFOLLOW: do not follow links to ensure to open the real file */
f = open(path, O_RDONLY | O_BINARY | O_NOFOLLOW);
@ -71,17 +64,39 @@ void state_nano(struct snapraid_state* state)
/* LCOV_EXCL_STOP */
}
/* set the tweaked modification time */
/* get the present timestamp, that may be different than the one */
/* in the content file */
ret = fstat(f, &st);
if (ret == -1) {
/* LCOV_EXCL_START */
close(f);
fprintf(stderr, "Error accessing file '%s'. %s.\n", path, strerror(errno));
continue;
/* LCOV_EXCL_STOP */
}
/* set the tweaked modification time, with new nano seconds */
ret = fmtime(f, st.st_mtime, nsec);
if (ret != 0) {
/* LCOV_EXCL_START */
close(f);
fprintf(stderr, "Error timing file '%s'. %s.\n", path, strerror(errno));
continue;
/* LCOV_EXCL_STOP */
}
/* uses fstat again to get the present timestamp */
/* this is needed because the value read */
/* may be different than the written one */
ret = fstat(f, &st);
if (ret == -1) {
/* LCOV_EXCL_START */
close(f);
fprintf(stderr, "Error accessing file '%s'. %s.\n", path, strerror(errno));
continue;
/* LCOV_EXCL_STOP */
}
/* close it */
ret = close(f);
if (ret != 0) {
@ -91,19 +106,8 @@ void state_nano(struct snapraid_state* state)
/* LCOV_EXCL_STOP */
}
/* uses stat again to get the present timestamp */
/* this is needed because the value read */
/* may be different than the written one */
ret = stat(path, &st);
if (ret == -1) {
/* LCOV_EXCL_START */
fprintf(stderr, "Error accessing file '%s'. %s.\n", path, strerror(errno));
continue;
/* LCOV_EXCL_STOP */
}
/* set the same nanosecond value in the content file */
/* note that if the second value is already matching */
/* note that if the seconds value is already matching */
/* the file won't be synched because the content file will */
/* contain the new updated timestamp */
file->mtime_nsec = STAT_NSEC(&st);