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linux: simplify uv_uptime() (#3859)

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Drop support for old kernels. Assume support for CLOCK_BOOTTIME.
This commit is contained in:
Ben Noordhuis 2022-12-15 12:57:14 +01:00 committed by GitHub
parent abf77a9eda
commit a3de1384c3
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1 changed files with 6 additions and 31 deletions
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37
src/unix/linux.c
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@ -124,19 +124,6 @@
# include <netpacket/packet.h>
#endif /* HAVE_IFADDRS_H */
/* Available from 2.6.32 onwards. */
#ifndef CLOCK_MONOTONIC_COARSE
# define CLOCK_MONOTONIC_COARSE 6
#endif
/* This is rather annoying: CLOCK_BOOTTIME lives in <linux/time.h> but we can't
* include that file because it conflicts with <time.h>. We'll just have to
* define it ourselves.
*/
#ifndef CLOCK_BOOTTIME
# define CLOCK_BOOTTIME 7
#endif
#define CAST(p) ((struct watcher_root*)(p))
struct watcher_list {
@ -732,30 +719,18 @@ err:
}
int uv_uptime(double* uptime) {
static volatile int no_clock_boottime;
char buf[128];
struct timespec now;
int r;
/* Try /proc/uptime first, then fallback to clock_gettime(). */
char buf[128];
/* Consult /proc/uptime when present (common case), or fall back to
* clock_gettime. Why not always clock_gettime? It doesn't always return the
* right result under OpenVZ and possibly other containerized environments.
*/
if (0 == uv__slurp("/proc/uptime", buf, sizeof(buf)))
if (1 == sscanf(buf, "%lf", uptime))
return 0;
/* Try CLOCK_BOOTTIME first, fall back to CLOCK_MONOTONIC if not available
* (pre-2.6.39 kernels). CLOCK_MONOTONIC doesn't increase when the system
* is suspended.
*/
if (no_clock_boottime) {
retry_clock_gettime: r = clock_gettime(CLOCK_MONOTONIC, &now);
}
else if ((r = clock_gettime(CLOCK_BOOTTIME, &now)) && errno == EINVAL) {
no_clock_boottime = 1;
goto retry_clock_gettime;
}
if (r)
if (clock_gettime(CLOCK_BOOTTIME, &now))
return UV__ERR(errno);
*uptime = now.tv_sec;