image: Use sub-second time info when available

configure.ac

@@ -269,6 +269,9 @@ EC_C_VISIBILITY(yes)
 EC_C_PACKING()
 EC_C_ASAN()
 
+AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec])
+AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
+
 VERSION_MAJOR=`echo $VERSION | awk -F. '{print $1}'`
 VERSION_MINOR=`echo $VERSION | awk -F. '{print $2}'`
 VERSION_MICRO=`echo $VERSION | awk -F. '{print $3}'`

src/lib/file.c

@@ -124,7 +124,28 @@ __imlib_FileIsFile(const char *s)
    return (S_ISREG(st.st_mode)) ? 1 : 0;
 }
 
-time_t
+#define STONS 1000000000ULL
+
+uint64_t
+__imlib_StatModDate(const struct stat *st)
+{
+   uint64_t            mtime_ns, ctime_ns;
+
+#if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
+   mtime_ns = st->st_mtim.tv_sec * STONS + st->st_mtim.tv_nsec;
+   ctime_ns = st->st_ctim.tv_sec * STONS + st->st_ctim.tv_nsec;
+#elif HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC
+   mtime_ns = st->st_mtimespec.tv_sec * STONS + st->st_mtimespec.tv_nsec;
+   ctime_ns = st->st_ctimespec.tv_sec * STONS + st->st_ctimespec.tv_nsec;
+#else
+   mtime_ns = st->st_mtime;
+   ctime_ns = st->st_ctime;
+#endif
+
+   return (mtime_ns > ctime_ns) ? mtime_ns : ctime_ns;
+}
+
+uint64_t
 __imlib_FileModDate(const char *s)
 {
    struct stat         st;
@@ -134,10 +155,10 @@ __imlib_FileModDate(const char *s)
    if (__imlib_FileStat(s, &st))
       return 0;
 
-   return (st.st_mtime > st.st_ctime) ? st.st_mtime : st.st_ctime;
+   return __imlib_StatModDate(&st);
 }
 
-time_t
+uint64_t
 __imlib_FileModDateFd(int fd)
 {
    struct stat         st;
@@ -145,7 +166,7 @@ __imlib_FileModDateFd(int fd)
    if (fstat(fd, &st) < 0)
       return 0;
 
-   return (st.st_mtime > st.st_ctime) ? st.st_mtime : st.st_ctime;
+   return __imlib_StatModDate(&st);
 }
 
 char              **

src/lib/file.h

@@ -1,7 +1,7 @@
 #ifndef __FILE_H
 #define __FILE_H 1
 
-#include <time.h>
+#include <stdint.h>
 #include <sys/stat.h>
 
 char               *__imlib_FileKey(const char *file);
@@ -9,11 +9,7 @@ char               *__imlib_FileRealFile(const char *file);
 
 const char         *__imlib_FileExtension(const char *file);
 
-static inline       time_t
-__imlib_StatModDate(const struct stat *st)
-{
-   return (st->st_mtime > st->st_ctime) ? st->st_mtime : st->st_ctime;
-}
+uint64_t            __imlib_StatModDate(const struct stat *st);
 
 static inline int
 __imlib_StatIsFile(const struct stat *st)
@@ -28,8 +24,9 @@ __imlib_StatIsDir(const struct stat *st)
 }
 
 int                 __imlib_FileIsFile(const char *s);
-time_t              __imlib_FileModDate(const char *s);
-time_t              __imlib_FileModDateFd(int fd);
+
+uint64_t            __imlib_FileModDate(const char *s);
+uint64_t            __imlib_FileModDateFd(int fd);
 
 char              **__imlib_FileDir(const char *dir, int *num);
 void                __imlib_FileFreeDirList(char **l, int num);

src/lib/image.c

@@ -498,7 +498,7 @@ __imlib_LoadImage(const char *file, ImlibLoadArgs * ila)
           {
              if (IM_FLAG_ISSET(im, F_ALWAYS_CHECK_DISK))
                {
-                  time_t              current_modified_time;
+                  uint64_t            current_modified_time;
 
                   current_modified_time = ila->fp ?
                      __imlib_FileModDateFd(fileno(ila->fp)) :

src/lib/image.h

@@ -70,7 +70,7 @@ struct _ImlibImage {
 
    char               *file;
    char               *key;
-   time_t              moddate;
+   uint64_t            moddate;
    unsigned int        flags;
    int                 references;
    char               *format;