Fix: logging: log_add_time() save/restore errno

[lttng-tools.git] / src / common / error.c

diff --git a/src/common/error.c b/src/common/error.c
index db3042318e169e72b2e31a28874c2396976a249b..4ea8e08607c6067a6bffa645c5bf2e377823dc14 100644 (file)
--- a/src/common/error.c
+++ b/src/common/error.c
@@ -20,6 +20,7 @@
 #include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
 #include <lttng/lttng-error.h>
 #include <common/common.h>
@@ -45,6 +46,7 @@ const char *log_add_time(void)
        struct tm tm, *res;
        struct timespec tp;
        time_t now;
+       const int errsv = errno;
 
        ret = lttng_clock_gettime(CLOCK_REALTIME, &tp);
        if (ret < 0) {
@@ -65,10 +67,12 @@ const char *log_add_time(void)
                goto error;
        }
 
+       errno = errsv;
        return URCU_TLS(error_log_time).str;
 
 error:
        /* Return an empty string on error so logging is not affected. */
+       errno = errsv;
        return "";
 }
 
@@ -190,6 +194,7 @@ static const char *error_string_array[] = {
        [ ERROR_INDEX(LTTNG_ERR_TRIGGER_EXISTS) ] = "Trigger already registered",
        [ ERROR_INDEX(LTTNG_ERR_TRIGGER_NOT_FOUND) ] = "Trigger not found",
        [ ERROR_INDEX(LTTNG_ERR_COMMAND_CANCELLED) ] = "Command cancelled",
+       [ ERROR_INDEX(LTTNG_ERR_AGENT_TRACING_DISABLED) ] = "Session daemon agent tracing is disabled",
 
        /* Last element */
        [ ERROR_INDEX(LTTNG_ERR_NR) ] = "Unknown error code"