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resolv: Use <file_change_detection.h> in __resolv_conf_get_current

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Only minor functional changes (i.e., regarding the handling of
directories, which are now treated as empty files).

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2020-01-21 16:52:33 +01:00
parent fe7df8eb5e
commit 9642b85fd0
1 changed files with 8 additions and 35 deletions
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43
resolv/resolv_conf.c
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@ -24,6 +24,7 @@
#include <resolv-internal.h>
#include <sys/stat.h>
#include <libc-symbols.h>
#include <file_change_detection.h>
/* _res._u._ext.__glibc_extension_index is used as an index into a
struct resolv_conf_array object. The intent of this construction
@ -68,12 +69,8 @@ struct resolv_conf_global
/* Cached current configuration object for /etc/resolv.conf. */
struct resolv_conf *conf_current;
/* These properties of /etc/resolv.conf are used to check if the
configuration needs reloading. */
struct timespec conf_mtime;
struct timespec conf_ctime;
off64_t conf_size;
ino64_t conf_ino;
/* File system identification for /etc/resolv.conf. */
struct file_change_detection file_resolve_conf;
};
/* Lazily allocated storage for struct resolv_conf_global. */
@ -123,37 +120,16 @@ conf_decrement (struct resolv_conf *conf)
struct resolv_conf *
__resolv_conf_get_current (void)
{
struct stat64 st;
if (stat64 (_PATH_RESCONF, &st) != 0)
{
switch (errno)
{
case EACCES:
case EISDIR:
case ELOOP:
case ENOENT:
case ENOTDIR:
case EPERM:
/* Ignore errors due to file system contents. */
memset (&st, 0, sizeof (st));
break;
default:
/* Other errors are fatal. */
return NULL;
}
}
struct file_change_detection initial;
if (!file_change_detection_for_path (&initial, _PATH_RESCONF))
return NULL;
struct resolv_conf_global *global_copy = get_locked_global ();
if (global_copy == NULL)
return NULL;
struct resolv_conf *conf;
if (global_copy->conf_current != NULL
&& (global_copy->conf_mtime.tv_sec == st.st_mtim.tv_sec
&& global_copy->conf_mtime.tv_nsec == st.st_mtim.tv_nsec
&& global_copy->conf_ctime.tv_sec == st.st_ctim.tv_sec
&& global_copy->conf_ctime.tv_nsec == st.st_ctim.tv_nsec
&& global_copy->conf_ino == st.st_ino
&& global_copy->conf_size == st.st_size))
&& file_is_unchanged (&initial, &global_copy->file_resolve_conf))
/* We can reuse the cached configuration object. */
conf = global_copy->conf_current;
else
@ -171,10 +147,7 @@ __resolv_conf_get_current (void)
read could be a newer version of the file, but this does
not matter because this will lead to an extraneous reload
later. */
global_copy->conf_mtime = st.st_mtim;
global_copy->conf_ctime = st.st_ctim;
global_copy->conf_ino = st.st_ino;
global_copy->conf_size = st.st_size;
global_copy->file_resolve_conf = initial;
}
}