Author: jah Date: Wed Feb 6 04:36:28 2019 New Revision: 343827 URL: https://svnweb.freebsd.org/changeset/base/343827
Log: r341692 changed cap_syslog(3) to preserve the stdio descriptors inherited from its parent so that LOG_PERROR would work. However, this caused dhclient(8)'s stdio streams to remain open across daemonization, breaking the ability to capture its foreground output as done in netconfig_ipv4. Fix this by reverting r341692 and instead passing the parent's stderr descriptor as an argument to cap_openlog() only when LOG_PERROR is specified in logopt. PR: 234514 Suggested by: markj Reported by: Shawn Webb Reviewed by: markj, oshogbo MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D18989 Modified: head/lib/libcasper/services/cap_syslog/cap_syslog.c Modified: head/lib/libcasper/services/cap_syslog/cap_syslog.c ============================================================================== --- head/lib/libcasper/services/cap_syslog/cap_syslog.c Wed Feb 6 04:00:37 2019 (r343826) +++ head/lib/libcasper/services/cap_syslog/cap_syslog.c Wed Feb 6 04:36:28 2019 (r343827) @@ -88,6 +88,9 @@ cap_openlog(cap_channel_t *chan, const char *ident, in } nvlist_add_number(nvl, "logopt", logopt); nvlist_add_number(nvl, "facility", facility); + if (logopt & LOG_PERROR) { + nvlist_add_descriptor(nvl, "stderr", STDERR_FILENO); + } nvl = cap_xfer_nvlist(chan, nvl); if (nvl == NULL) { return; @@ -131,6 +134,7 @@ cap_setlogmask(cap_channel_t *chan, int maskpri) */ static char *LogTag; +static int prev_stderr = -1; static void slog_vsyslog(const nvlist_t *limits __unused, const nvlist_t *nvlin, @@ -146,6 +150,8 @@ slog_openlog(const nvlist_t *limits __unused, const nv nvlist_t *nvlout __unused) { const char *ident; + uint64_t logopt; + int stderr_fd; ident = dnvlist_get_string(nvlin, "ident", NULL); if (ident != NULL) { @@ -153,8 +159,19 @@ slog_openlog(const nvlist_t *limits __unused, const nv LogTag = strdup(ident); } - openlog(LogTag, nvlist_get_number(nvlin, "logopt"), - nvlist_get_number(nvlin, "facility")); + logopt = nvlist_get_number(nvlin, "logopt"); + if (logopt & LOG_PERROR) { + stderr_fd = dnvlist_get_descriptor(nvlin, "stderr", -1); + if (prev_stderr == -1) + prev_stderr = dup(STDERR_FILENO); + if (prev_stderr != -1) + (void)dup2(stderr_fd, STDERR_FILENO); + } else if (prev_stderr != -1) { + (void)dup2(prev_stderr, STDERR_FILENO); + close(prev_stderr); + prev_stderr = -1; + } + openlog(LogTag, logopt, nvlist_get_number(nvlin, "facility")); } static void @@ -166,6 +183,12 @@ slog_closelog(const nvlist_t *limits __unused, const n free(LogTag); LogTag = NULL; + + if (prev_stderr != -1) { + (void)dup2(prev_stderr, STDERR_FILENO); + close(prev_stderr); + prev_stderr = -1; + } } static void @@ -198,4 +221,4 @@ syslog_command(const char *cmd, const nvlist_t *limits return (0); } -CREATE_SERVICE("system.syslog", NULL, syslog_command, CASPER_SERVICE_STDIO); +CREATE_SERVICE("system.syslog", NULL, syslog_command, 0); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
