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95 lines
3.3 KiB
95 lines
3.3 KiB
2 years ago
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From: Florian Weimer <fweimer@redhat.com>
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Date: Tue, 21 Jan 2020 15:52:33 +0000 (+0100)
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Subject: resolv: Use <file_change_detection.h> in __resolv_conf_get_current
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X-Git-Url: https://sourceware.org/git/?p=glibc.git;a=commitdiff_plain;h=9642b85fd0dfa5731020a3271c08e33e1dc05c85
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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
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directories, which are now treated as empty files).
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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---
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diff --git a/resolv/resolv_conf.c b/resolv/resolv_conf.c
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index 08c50ef19e..d954ba9a5a 100644
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--- a/resolv/resolv_conf.c
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+++ b/resolv/resolv_conf.c
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@@ -24,6 +24,7 @@
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#include <resolv-internal.h>
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#include <sys/stat.h>
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#include <libc-symbols.h>
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+#include <file_change_detection.h>
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/* _res._u._ext.__glibc_extension_index is used as an index into a
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struct resolv_conf_array object. The intent of this construction
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@@ -68,12 +69,8 @@ struct resolv_conf_global
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/* Cached current configuration object for /etc/resolv.conf. */
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struct resolv_conf *conf_current;
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- /* These properties of /etc/resolv.conf are used to check if the
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- configuration needs reloading. */
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- struct timespec conf_mtime;
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- struct timespec conf_ctime;
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- off64_t conf_size;
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- ino64_t conf_ino;
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+ /* File system identification for /etc/resolv.conf. */
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+ struct file_change_detection file_resolve_conf;
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};
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/* Lazily allocated storage for struct resolv_conf_global. */
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@@ -123,37 +120,16 @@ conf_decrement (struct resolv_conf *conf)
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struct resolv_conf *
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__resolv_conf_get_current (void)
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{
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- struct stat64 st;
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- if (stat64 (_PATH_RESCONF, &st) != 0)
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- {
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- switch (errno)
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- {
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- case EACCES:
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- case EISDIR:
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- case ELOOP:
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- case ENOENT:
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- case ENOTDIR:
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- case EPERM:
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- /* Ignore errors due to file system contents. */
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- memset (&st, 0, sizeof (st));
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- break;
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- default:
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- /* Other errors are fatal. */
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- return NULL;
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- }
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- }
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+ struct file_change_detection initial;
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+ if (!file_change_detection_for_path (&initial, _PATH_RESCONF))
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+ return NULL;
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struct resolv_conf_global *global_copy = get_locked_global ();
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if (global_copy == NULL)
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return NULL;
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struct resolv_conf *conf;
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if (global_copy->conf_current != NULL
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- && (global_copy->conf_mtime.tv_sec == st.st_mtim.tv_sec
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- && global_copy->conf_mtime.tv_nsec == st.st_mtim.tv_nsec
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- && global_copy->conf_ctime.tv_sec == st.st_ctim.tv_sec
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- && global_copy->conf_ctime.tv_nsec == st.st_ctim.tv_nsec
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- && global_copy->conf_ino == st.st_ino
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- && global_copy->conf_size == st.st_size))
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+ && file_is_unchanged (&initial, &global_copy->file_resolve_conf))
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/* We can reuse the cached configuration object. */
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conf = global_copy->conf_current;
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else
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@@ -171,10 +147,7 @@ __resolv_conf_get_current (void)
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read could be a newer version of the file, but this does
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not matter because this will lead to an extraneous reload
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later. */
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- global_copy->conf_mtime = st.st_mtim;
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- global_copy->conf_ctime = st.st_ctim;
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- global_copy->conf_ino = st.st_ino;
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- global_copy->conf_size = st.st_size;
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+ global_copy->file_resolve_conf = initial;
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}
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}
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