diff --git a/src/unix/linux-core.c b/src/unix/linux-core.c index 4db2f050..3d2d4cf7 100644 --- a/src/unix/linux-core.c +++ b/src/unix/linux-core.c @@ -602,22 +602,53 @@ err: return UV_EINVAL; } +static int uv__slurp(const char* filename, char* buf, size_t len) { + ssize_t n; + int fd; + + assert(len > 0); + + fd = uv__open_cloexec(filename, O_RDONLY); + if (fd < 0) + return fd; + + do + n = read(fd, buf, len - 1); + while (n == -1 && errno == EINTR); + + if (uv__close_nocheckstdio(fd)) + abort(); + + if (n < 0) + return UV__ERR(errno); + + buf[n] = '\0'; + + return 0; +} 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(). */ + + if (0 == uv__slurp("/proc/uptime", buf, sizeof(buf))) + if (1 == sscanf(buf, "%f", 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: r = clock_gettime(CLOCK_MONOTONIC, &now); + 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; + goto retry_clock_gettime; } if (r) @@ -1025,32 +1056,6 @@ void uv__set_process_title(const char* title) { } -static int uv__slurp(const char* filename, char* buf, size_t len) { - ssize_t n; - int fd; - - assert(len > 0); - - fd = uv__open_cloexec(filename, O_RDONLY); - if (fd < 0) - return fd; - - do - n = read(fd, buf, len - 1); - while (n == -1 && errno == EINTR); - - if (uv__close_nocheckstdio(fd)) - abort(); - - if (n < 0) - return UV__ERR(errno); - - buf[n] = '\0'; - - return 0; -} - - static uint64_t uv__read_proc_meminfo(const char* what) { uint64_t rc; char* p;