diff options
Diffstat (limited to 'qga/commands-posix.c')
| -rw-r--r-- | qga/commands-posix.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/qga/commands-posix.c b/qga/commands-posix.c index cae41716ca..91885604c4 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -142,7 +142,7 @@ int64_t qmp_guest_get_time(Error **errp) return time_ns; } -void qmp_guest_set_time(int64_t time_ns, Error **errp) +void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp) { int ret; int status; @@ -150,22 +150,28 @@ void qmp_guest_set_time(int64_t time_ns, Error **errp) Error *local_err = NULL; struct timeval tv; - /* year-2038 will overflow in case time_t is 32bit */ - if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) { - error_setg(errp, "Time %" PRId64 " is too large", time_ns); - return; - } + /* If user has passed a time, validate and set it. */ + if (has_time) { + /* year-2038 will overflow in case time_t is 32bit */ + if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) { + error_setg(errp, "Time %" PRId64 " is too large", time_ns); + return; + } - tv.tv_sec = time_ns / 1000000000; - tv.tv_usec = (time_ns % 1000000000) / 1000; + tv.tv_sec = time_ns / 1000000000; + tv.tv_usec = (time_ns % 1000000000) / 1000; - ret = settimeofday(&tv, NULL); - if (ret < 0) { - error_setg_errno(errp, errno, "Failed to set time to guest"); - return; + ret = settimeofday(&tv, NULL); + if (ret < 0) { + error_setg_errno(errp, errno, "Failed to set time to guest"); + return; + } } - /* Set the Hardware Clock to the current System Time. */ + /* Now, if user has passed a time to set and the system time is set, we + * just need to synchronize the hardware clock. However, if no time was + * passed, user is requesting the opposite: set the system time from the + * hardware clock. */ pid = fork(); if (pid == 0) { setsid(); @@ -173,7 +179,10 @@ void qmp_guest_set_time(int64_t time_ns, Error **errp) reopen_fd_to_null(1); reopen_fd_to_null(2); - execle("/sbin/hwclock", "hwclock", "-w", NULL, environ); + /* Use '/sbin/hwclock -w' to set RTC from the system time, + * or '/sbin/hwclock -s' to set the system time from RTC. */ + execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s", + NULL, environ); _exit(EXIT_FAILURE); } else if (pid < 0) { error_setg_errno(errp, errno, "failed to create child process"); |