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[tor-commits] [tor/master] Always check returns from unlink()
commit abdf1878a3f8fe366d8bb7f649127880bdbdf82d
Author: Andrea Shepard <andrea@xxxxxxxxxxxxxx>
Date: Tue Mar 18 17:52:31 2014 -0700
Always check returns from unlink()
---
src/common/util.c | 9 ++++++++-
src/or/config.c | 5 ++++-
src/or/hibernate.c | 10 +++++++++-
src/or/main.c | 17 +++++++++++++----
src/or/networkstatus.c | 21 +++++++++++++++++----
src/or/statefile.c | 10 ++++++++--
6 files changed, 59 insertions(+), 13 deletions(-)
diff --git a/src/common/util.c b/src/common/util.c
index 3c2f664..c4f8c88 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -2141,6 +2141,7 @@ static int
finish_writing_to_file_impl(open_file_t *file_data, int abort_write)
{
int r = 0;
+
tor_assert(file_data && file_data->filename);
if (file_data->stdio_file) {
if (fclose(file_data->stdio_file)) {
@@ -2157,7 +2158,13 @@ finish_writing_to_file_impl(open_file_t *file_data, int abort_write)
if (file_data->rename_on_close) {
tor_assert(file_data->tempname && file_data->filename);
if (abort_write) {
- unlink(file_data->tempname);
+ int res = unlink(file_data->tempname);
+ if (res != 0) {
+ /* We couldn't unlink and we'll leave a mess behind */
+ log_warn(LD_FS, "Failed to unlink %s: %s",
+ file_data->tempname, strerror(errno));
+ r = -1;
+ }
} else {
tor_assert(strcmp(file_data->filename, file_data->tempname));
if (replace_file(file_data->tempname, file_data->filename)) {
diff --git a/src/or/config.c b/src/or/config.c
index 0da4877..5b590f2 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -6464,7 +6464,10 @@ remove_file_if_very_old(const char *fname, time_t now)
format_local_iso_time(buf, st.st_mtime);
log_notice(LD_GENERAL, "Obsolete file %s hasn't been modified since %s. "
"Removing it.", fname, buf);
- unlink(fname);
+ if (unlink(fname) != 0) {
+ log_warn(LD_FS, "Failed to unlink %s: %s",
+ fname, strerror(errno));
+ }
}
}
diff --git a/src/or/hibernate.c b/src/or/hibernate.c
index 607dec8..bbda842 100644
--- a/src/or/hibernate.c
+++ b/src/or/hibernate.c
@@ -648,7 +648,15 @@ read_bandwidth_usage(void)
{
char *fname = get_datadir_fname("bw_accounting");
- unlink(fname);
+ int res;
+
+ res = unlink(fname);
+ if (res != 0) {
+ log_warn(LD_FS,
+ "Failed to unlink %s: %s",
+ fname, strerror(errno));
+ }
+
tor_free(fname);
}
diff --git a/src/or/main.c b/src/or/main.c
index 7294c89..3d5ce10 100644
--- a/src/or/main.c
+++ b/src/or/main.c
@@ -2574,10 +2574,19 @@ tor_cleanup(void)
time_t now = time(NULL);
/* Remove our pid file. We don't care if there was an error when we
* unlink, nothing we could do about it anyways. */
- if (options->PidFile)
- unlink(options->PidFile);
- if (options->ControlPortWriteToFile)
- unlink(options->ControlPortWriteToFile);
+ if (options->PidFile) {
+ if (unlink(options->PidFile) != 0) {
+ log_warn(LD_FS, "Couldn't unlink pid file %s: %s",
+ options->PidFile, strerror(errno));
+ }
+ }
+ if (options->ControlPortWriteToFile) {
+ if (unlink(options->ControlPortWriteToFile) != 0) {
+ log_warn(LD_FS, "Couldn't unlink control port file %s: %s",
+ options->ControlPortWriteToFile,
+ strerror(errno));
+ }
+ }
if (accounting_is_enabled(options))
accounting_record_bandwidth_usage(now, get_or_state());
or_state_mark_dirty(get_or_state(), 0); /* force an immediate save. */
diff --git a/src/or/networkstatus.c b/src/or/networkstatus.c
index 49478a7..74c4ca4 100644
--- a/src/or/networkstatus.c
+++ b/src/or/networkstatus.c
@@ -1254,7 +1254,11 @@ networkstatus_set_current_consensus(const char *consensus,
/* Even if we had enough signatures, we'd never use this as the
* latest consensus. */
if (was_waiting_for_certs && from_cache)
- unlink(unverified_fname);
+ if (unlink(unverified_fname) != 0) {
+ log_warn(LD_FS,
+ "Failed to unlink %s: %s",
+ unverified_fname, strerror(errno));
+ }
}
goto done;
} else {
@@ -1264,8 +1268,13 @@ networkstatus_set_current_consensus(const char *consensus,
"consensus");
result = -2;
}
- if (was_waiting_for_certs && (r < -1) && from_cache)
- unlink(unverified_fname);
+ if (was_waiting_for_certs && (r < -1) && from_cache) {
+ if (unlink(unverified_fname) != 0) {
+ log_warn(LD_FS,
+ "Failed to unlink %s: %s",
+ unverified_fname, strerror(errno));
+ }
+ }
goto done;
}
}
@@ -1313,7 +1322,11 @@ networkstatus_set_current_consensus(const char *consensus,
waiting->body = NULL;
waiting->set_at = 0;
waiting->dl_failed = 0;
- unlink(unverified_fname);
+ if (unlink(unverified_fname) != 0) {
+ log_warn(LD_FS,
+ "Failed to unlink %s: %s",
+ unverified_fname, strerror(errno));
+ }
}
/* Reset the failure count only if this consensus is actually valid. */
diff --git a/src/or/statefile.c b/src/or/statefile.c
index 8ab0476..2251f25 100644
--- a/src/or/statefile.c
+++ b/src/or/statefile.c
@@ -260,7 +260,7 @@ or_state_set(or_state_t *new_state)
static void
or_state_save_broken(char *fname)
{
- int i;
+ int i, res;
file_status_t status;
char *fname2 = NULL;
for (i = 0; i < 100; ++i) {
@@ -274,7 +274,13 @@ or_state_save_broken(char *fname)
log_warn(LD_BUG, "Unable to parse state in \"%s\"; too many saved bad "
"state files to move aside. Discarding the old state file.",
fname);
- unlink(fname);
+ res = unlink(fname);
+ if (res != 0) {
+ log_warn(LD_FS,
+ "Also couldn't discard old state file \"%s\" because "
+ "unlink() failed: %s",
+ fname, strerror(errno));
+ }
} else {
log_warn(LD_BUG, "Unable to parse state in \"%s\". Moving it aside "
"to \"%s\". This could be a bug in Tor; please tell "
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