6 files changed, 120 insertions, 0 deletions
diff --git a/src/detection/uptime/uptime.h b/src/detection/uptime/uptime.h
new file mode 100644
index 0000000..3f8631c
--- /dev/null
+++ b/src/detection/uptime/uptime.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "fastfetch.h"
+#include "modules/uptime/option.h"
+
+typedef struct FFUptimeResult {
+    uint64_t bootTime;
+    uint64_t uptime;
+} FFUptimeResult;
+
+const char* ffDetectUptime(FFUptimeResult* result);
diff --git a/src/detection/uptime/uptime_bsd.c b/src/detection/uptime/uptime_bsd.c
new file mode 100644
index 0000000..46943b0
--- /dev/null
+++ b/src/detection/uptime/uptime_bsd.c
@@ -0,0 +1,27 @@
+#include "uptime.h"
+#include "common/time.h"
+
+#include <sys/sysctl.h>
+#include <sys/time.h>
+
+const char* ffDetectUptime(FFUptimeResult* result) {
+#if __NetBSD__
+    struct timespec bootTime;
+#else
+    struct timeval bootTime;
+#endif
+    size_t bootTimeSize = sizeof(bootTime);
+    if (sysctl(
+            (int[]) { CTL_KERN, KERN_BOOTTIME }, 2, &bootTime, &bootTimeSize, NULL, 0) != 0) {
+        return "sysctl({CTL_KERN, KERN_BOOTTIME}) failed";
+    }
+
+#if __NetBSD__
+    result->bootTime = (uint64_t) bootTime.tv_sec * 1000 + (uint64_t) bootTime.tv_nsec / 1000000;
+#else
+    result->bootTime = (uint64_t) bootTime.tv_sec * 1000 + (uint64_t) bootTime.tv_usec / 1000;
+#endif
+    result->uptime = ffTimeGetNow() - result->bootTime;
+
+    return NULL;
+}
diff --git a/src/detection/uptime/uptime_haiku.c b/src/detection/uptime/uptime_haiku.c
new file mode 100644
index 0000000..bf5dd25
--- /dev/null
+++ b/src/detection/uptime/uptime_haiku.c
@@ -0,0 +1,8 @@
+#include "uptime.h"
+#include "common/time.h"
+
+const char* ffDetectUptime(FFUptimeResult* result) {
+    result->uptime = (uint64_t) system_time() / 1000;
+    result->bootTime = ffTimeGetNow() - result->uptime;
+    return NULL;
+}
diff --git a/src/detection/uptime/uptime_linux.c b/src/detection/uptime/uptime_linux.c
new file mode 100644
index 0000000..75c7768
--- /dev/null
+++ b/src/detection/uptime/uptime_linux.c
@@ -0,0 +1,38 @@
+#include "uptime.h"
+#include "common/time.h"
+#include "common/io.h"
+
+#include <inttypes.h>
+
+const char* ffDetectUptime(FFUptimeResult* result) {
+#ifndef __ANDROID__ // cat: /proc/uptime: Permission denied
+
+    // #620
+    char buf[64];
+    ssize_t nRead = ffReadFileData("/proc/uptime", ARRAY_SIZE(buf) - 1, buf);
+    if (nRead > 0) {
+        buf[nRead] = '\0';
+
+        char* err = NULL;
+        double sec = strtod(buf, &err);
+        if (err != buf) {
+            result->uptime = (uint64_t) (sec * 1000);
+            result->bootTime = ffTimeGetNow() - result->uptime;
+            return NULL;
+        }
+    }
+
+#endif
+#ifndef __GNU__
+    struct timespec uptime;
+    if (clock_gettime(CLOCK_BOOTTIME, &uptime) != 0) {
+        return "clock_gettime(CLOCK_BOOTTIME) failed";
+    }
+
+    result->uptime = (uint64_t) uptime.tv_sec * 1000 + (uint64_t) uptime.tv_nsec / 1000000;
+    result->bootTime = ffTimeGetNow() - result->uptime;
+    return NULL;
+#else
+    return "read(/proc/uptime) failed";
+#endif
+}
diff --git a/src/detection/uptime/uptime_sunos.c b/src/detection/uptime/uptime_sunos.c
new file mode 100644
index 0000000..2a37299
--- /dev/null
+++ b/src/detection/uptime/uptime_sunos.c
@@ -0,0 +1,19 @@
+#include "uptime.h"
+#include "common/time.h"
+
+#include <utmpx.h>
+
+const char* ffDetectUptime(FFUptimeResult* result) {
+    struct utmpx* ut;
+
+    setutxent();
+    while (NULL != (ut = getutxent())) {
+        if (ut->ut_type == BOOT_TIME) {
+            result->bootTime = (uint64_t) ut->ut_tv.tv_sec * 1000 + (uint64_t) ut->ut_tv.tv_usec / 1000000;
+            result->uptime = ffTimeGetNow() - result->bootTime;
+            break;
+        }
+    }
+    endutxent();
+    return NULL;
+}
diff --git a/src/detection/uptime/uptime_windows.c b/src/detection/uptime/uptime_windows.c
new file mode 100644
index 0000000..695edad
--- /dev/null
+++ b/src/detection/uptime/uptime_windows.c
@@ -0,0 +1,17 @@
+#include "uptime.h"
+#include "common/time.h"
+#include "common/windows/nt.h"
+
+const char* ffDetectUptime(FFUptimeResult* result) {
+    // QueryInterruptTime with Win7 support
+    uint64_t interruptTime = ffKSystemTimeToUInt64(&SharedUserData->InterruptTime);
+
+    result->uptime = interruptTime / 10000; // Convert from 100-nanosecond intervals to milliseconds
+    result->bootTime = ffTimeGetNow() - result->uptime;
+
+    // Alternatively, `NtQuerySystemInformation(SystemTimeOfDayInformation)` reports the boot time directly,
+    // whose result exactly equals what WMI `Win32_OperatingSystem` reports
+    // with much lower accuracy (0.5 seconds)
+
+    return NULL;
+}