phc2sys: add selecting clock by name.
This allows synchronization of a PHC to the system clock. Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>master
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2f3b9f718f
commit
d0714a9fac
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@ -53,8 +53,8 @@ is started or the
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option should be used too.
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.TP
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.BI \-s " phc-device"
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Specify the device of the master clock (e.g. /dev/ptp0). When this option is
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used together with the
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Specify the master clock by device (e.g. /dev/ptp0) or name (e.g. CLOCK_REALTIME
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for the system clock). When this option is used together with the
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.B \-d
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option, the master clock is read only on start to fix an offset over 0.5
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seconds which cannot be fixed with PPS alone.
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@ -65,8 +65,8 @@ Similar to the
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option, but specified by the interface which provides the master clock.
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.TP
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.BI \-c " phc-device"
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Specify the device of the slave clock (e.g. /dev/ptp1). The default slave clock
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is the system clock (CLOCK_REALTIME).
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Specify the slave clock by device (e.g. /dev/ptp1) or name. The default is
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CLOCK_REALTIME (the system clock).
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.TP
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.BI \-P " kp"
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Specify the proportional constant of the PI controller. The default is 0.7.
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12
phc2sys.c
12
phc2sys.c
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@ -44,7 +44,17 @@
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static clockid_t clock_open(char *device)
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{
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int fd = open(device, O_RDWR);
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int fd;
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if (device[0] != '/') {
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if (!strcasecmp(device, "CLOCK_REALTIME"))
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return CLOCK_REALTIME;
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fprintf(stderr, "unknown clock %s\n", device);
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return CLOCK_INVALID;
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}
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fd = open(device, O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "cannot open %s: %m\n", device);
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return CLOCK_INVALID;
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