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am dbcba8f5: Merge "Reduce stack usage of tmpfile(3)."

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* commit 'dbcba8f5f9a59fac3d22dfc17a14d3d5cfb4f4b0':
  Reduce stack usage of tmpfile(3).
This commit is contained in:
Elliott Hughes 2014-05-13 17:37:22 +00:00 committed by Android Git Automerger
commit 2b5503b578
2 changed files with 10 additions and 6 deletions
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5
libc/Android.mk
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@ -725,7 +725,10 @@ include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := $(libc_bionic_src_files)
LOCAL_CFLAGS := $(libc_common_cflags) -Werror
LOCAL_CFLAGS := $(libc_common_cflags) \
-Werror \
-Wframe-larger-than=2048 \
LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
LOCAL_CPPFLAGS := $(libc_common_cppflags)
LOCAL_C_INCLUDES := $(libc_common_c_includes)

11
libc/bionic/tmpfile.cpp
View File

@ -57,22 +57,23 @@ class ScopedSignalBlocker {
};
static FILE* __tmpfile_dir(const char* tmp_dir) {
char buf[PATH_MAX];
int path_length = snprintf(buf, sizeof(buf), "%s/tmp.XXXXXXXXXX", tmp_dir);
if (path_length >= static_cast<int>(sizeof(buf))) {
char* path = NULL;
if (asprintf(&path, "%s/tmp.XXXXXXXXXX", tmp_dir) == -1) {
return NULL;
}
int fd;
{
ScopedSignalBlocker ssb;
fd = mkstemp(buf);
fd = mkstemp(path);
if (fd == -1) {
free(path);
return NULL;
}
// Unlink the file now so that it's removed when closed.
unlink(buf);
unlink(path);
free(path);
// Can we still use the file now it's unlinked?
// File systems without hard link support won't have the usual Unix semantics.