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Make logging fall back to /dev/stderr if we're on the host.

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Otherwise you get no logging, which sucks.

Change-Id: Iea1e8f996461afbb217a55711b7967005c39cfcb
This commit is contained in:
Elliott Hughes
2013-10-08 13:19:00 -07:00
parent 9c710927ab
commit 0f395b7ba0
2 changed files with 25 additions and 5 deletions
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25
libc/bionic/libc_logging.cpp
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@@ -419,9 +419,34 @@ int __libc_format_fd(int fd, const char* format, ...) {
return os.total;
}
static int __libc_write_stderr(const char* tag, const char* msg) {
int fd = TEMP_FAILURE_RETRY(open("/dev/stderr", O_CLOEXEC | O_WRONLY));
if (fd == -1) {
return -1;
}
iovec vec[4];
vec[0].iov_base = const_cast<char*>(tag);
vec[0].iov_len = strlen(tag);
vec[1].iov_base = const_cast<char*>(": ");
vec[1].iov_len = 2;
vec[2].iov_base = const_cast<char*>(msg);
vec[2].iov_len = strlen(msg) + 1;
vec[3].iov_base = const_cast<char*>("\n");
vec[3].iov_len = 1;
int result = TEMP_FAILURE_RETRY(writev(fd, vec, 4));
close(fd);
return result;
}
static int __libc_write_log(int priority, const char* tag, const char* msg) {
int main_log_fd = TEMP_FAILURE_RETRY(open("/dev/log/main", O_CLOEXEC | O_WRONLY));
if (main_log_fd == -1) {
if (errno == ENOTDIR) {
// /dev/log isn't a directory? Maybe we're running on the host? Try stderr instead.
return __libc_write_stderr(tag, msg);
}
return -1;
}