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log: a bit clearer calls to dup()

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This commit is contained in:
Robert Swiecki 2019-08-22 13:59:15 +02:00
parent c291b11ae6
commit b435292e9a
1 changed files with 18 additions and 14 deletions
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32
logs.cc
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@ -45,12 +45,17 @@ static bool _log_fd_isatty = true;
static enum llevel_t _log_level = INFO;
static bool _log_set = false;
int getDupLogFd(int fd) {
fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (fd >= 0) {
return fd;
static void setDupLogFdOr(int fd, int orfd) {
int saved_errno = errno;
_log_fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (_log_fd == -1) {
_log_fd = fcntl(orfd, F_DUPFD_CLOEXEC, 0);
}
return STDERR_FILENO;
if (_log_fd == -1) {
_log_fd = orfd;
}
_log_fd_isatty = (isatty(_log_fd) == 1);
errno = saved_errno;
}
/*
@ -58,8 +63,7 @@ int getDupLogFd(int fd) {
* connection socket with fd (0, 1, 2).
*/
__attribute__((constructor)) static void log_init(void) {
_log_fd = getDupLogFd(STDERR_FILENO);
_log_fd_isatty = isatty(_log_fd);
setDupLogFdOr(STDERR_FILENO, STDERR_FILENO);
}
bool logSet() {
@ -76,14 +80,14 @@ void logFile(const std::string& logfile) {
if (_log_fd > STDERR_FILENO) {
close(_log_fd);
}
if (TEMP_FAILURE_RETRY(_log_fd = open(logfile.c_str(),
O_CREAT | O_RDWR | O_APPEND | O_CLOEXEC, 0640)) == -1) {
int saved_errno = errno;
_log_fd = getDupLogFd(STDERR_FILENO);
LOG_W(
"Couldn't open logfile open('%s'): %s", logfile.c_str(), strerror(saved_errno));
int newlogfd = TEMP_FAILURE_RETRY(
open(logfile.c_str(), O_CREAT | O_RDWR | O_APPEND | O_CLOEXEC, 0640));
setDupLogFdOr(newlogfd, STDERR_FILENO);
if (newlogfd == -1) {
PLOG_W("Couldn't open logfile open('%s')", logfile.c_str());
} else {
close(newlogfd);
}
_log_fd_isatty = (isatty(_log_fd) == 1);
}
void logMsg(enum llevel_t ll, const char* fn, int ln, bool perr, const char* fmt, ...) {