diff -uNr psmisc/src/killall.c psmisc.mod/src/killall.c
--- psmisc/src/killall.c	2022-03-18 06:47:48.712425525 +0800
+++ psmisc.mod/src/killall.c	2022-08-04 00:04:01.358949441 +0800
@@ -46,6 +46,10 @@
 #include <ctype.h>
 #include <assert.h>
 
+#ifdef __ANDROID__
+#include <sys/sysinfo.h>
+#endif
+
 #ifdef WITH_SELINUX
 #include <dlfcn.h>
 #include <selinux/selinux.h>
@@ -135,6 +139,16 @@
 static double
 uptime()
 {
+#ifdef __ANDROID__
+    /* Android does not allow read access to /proc/uptime */
+    struct sysinfo system_information;
+    if (sysinfo(&system_information) == 0) {
+        return (double) system_information.uptime;
+    } else {
+        fprintf(stderr, "pstree: error obtaining uptime from sysinfo\n");
+        exit(1);
+    }
+#else
     char * savelocale;
     char buf[2048];
     FILE* file;
@@ -147,6 +161,7 @@
     fclose(file);
     setlocale(LC_NUMERIC,savelocale);
     return atof(buf);
+#endif
 }
 
 /* process age from jiffies to seconds via uptime */