Merge pull request #540 from AbhiTheModder/android

Add Android compatibility

Author: wolfcw

src/Makefile

@@ -126,6 +126,14 @@ PREFIX ?= /usr/local
 LIBDIRNAME ?= /lib/faketime
 PLATFORM ?=$(shell uname)
 
+ifneq ($(filter android%,$(subst -, ,$(CC))),)
+IS_ANDROID := true
+endif
+
+ifeq ($(shell $(CC) -dM -E - < /dev/null | grep -c "__ANDROID__"),1)
+IS_ANDROID := true
+endif
+
 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
 COMPILER := clang
 else
@@ -147,15 +155,26 @@ ifeq ($(PLATFORM),SunOS)
 CFLAGS += -D__EXTENSIONS__ -D_XOPEN_SOURCE=600
 endif
 
+ifdef IS_ANDROID
+CFLAGS += -D__ANDROID__
+endif
+
 LIB_LDFLAGS += -shared
 
 LDFLAGS += $(FAKETIME_LINK_FLAGS)
 ifneq ($(PLATFORM),SunOS)
+ifndef IS_ANDROID
 LDFLAGS += -Wl,--version-script=libfaketime.map
 endif
+endif
 
+ifdef IS_ANDROID
+LDADD += -ldl -lm
+BIN_LDFLAGS +=
+else
 LDADD += -ldl -lm -lrt -lpthread
 BIN_LDFLAGS += -lrt -lpthread
+endif
 
 SRC = libfaketime.c
 LIBS_OBJ = libfaketime.o libfaketimeMT.o

src/android_compat.h

@@ -0,0 +1,51 @@
+#ifndef ANDROID_COMPAT_H
+#define ANDROID_COMPAT_H
+
+#ifdef __ANDROID__
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+static inline const char *__android_shm_tmpdir(void)
+{
+    const char *dir = getenv("FAKETIME_SHM_DIR");
+    if (dir == NULL)
+        dir = getenv("TMPDIR");
+    if (dir == NULL)
+        dir = "/data/local/tmp";
+    return dir;
+}
+
+static inline int __android_shm_open(const char *name, int oflag, mode_t mode)
+{
+    char path[512];
+    const char *dir = __android_shm_tmpdir();
+    while (*name == '/') name++;
+    snprintf(path, sizeof(path), "%s/faketime_shm_%s", dir, name);
+    int fd = open(path, oflag, mode);
+    if (fd == -1 && (oflag & O_CREAT))
+    {
+        mkdir(dir, 0777);
+        fd = open(path, oflag, mode);
+    }
+    return fd;
+}
+
+static inline int __android_shm_unlink(const char *name)
+{
+    char path[512];
+    const char *dir = __android_shm_tmpdir();
+    while (*name == '/') name++;
+    snprintf(path, sizeof(path), "%s/faketime_shm_%s", dir, name);
+    return unlink(path);
+}
+
+#define shm_open __android_shm_open
+#define shm_unlink __android_shm_unlink
+
+#endif /* __ANDROID__ */
+#endif /* ANDROID_COMPAT_H */

src/faketime.c

@@ -46,6 +46,7 @@
 #include <sys/mman.h>
 #include "ft_sem.h"
 
+#include "android_compat.h"
 #include "faketime_common.h"
 
 const char version[] = "0.9.12";

src/ft_sem.c

@@ -73,7 +73,14 @@ static int ft_sem_name_to_path(const char *name, char *path, size_t pathlen)
     return -1;
   }
   const char *pid_str = p + strlen(prefix);
-  snprintf(path, pathlen, "/dev/shm/faketime_lock_%s", pid_str);
+  const char *tmpdir;
+#ifdef __ANDROID__
+  tmpdir = getenv("TMPDIR");
+  if (tmpdir == NULL) tmpdir = "/data/local/tmp";
+#else
+  tmpdir = "/dev/shm";
+#endif
+  snprintf(path, pathlen, "%s/faketime_lock_%s", tmpdir, pid_str);
   path[pathlen - 1] = '\0';
   return 0;
 }