src/stat/utimensat.c

   1 #include <sys/stat.h>
   2 #include <sys/time.h>
   3 #include <fcntl.h>
   4 #include <errno.h>
   5 #include "syscall.h"
   6
   7 #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   8 #define NS_SPECIAL(ns) ((ns)==UTIME_NOW || (ns)==UTIME_OMIT)
   9
  10 int utimensat(int fd, const char *path, const struct timespec times[2], int flags)
  11 {
  12         int r;
  13         if (times && times[0].tv_nsec==UTIME_NOW && times[1].tv_nsec==UTIME_NOW)
  14                 times = 0;
  15 #ifdef SYS_utimensat_time64
  16         r = -ENOSYS;
  17         time_t s0=0, s1=0;
  18         long ns0=0, ns1=0;
  19         if (times) {
  20                 ns0 = times[0].tv_nsec;
  21                 ns1 = times[1].tv_nsec;
  22                 if (!NS_SPECIAL(ns0)) s0 = times[0].tv_sec;
  23                 if (!NS_SPECIAL(ns1)) s1 = times[1].tv_sec;
  24         }
  25         if (SYS_utimensat == SYS_utimensat_time64 || !IS32BIT(s0) || !IS32BIT(s1))
  26                 r = __syscall(SYS_utimensat_time64, fd, path, times ?
  27                         ((long long[]){s0, ns0, s1, ns1}) : 0, flags);
  28         if (SYS_utimensat == SYS_utimensat_time64 || r!=-ENOSYS)
  29                 return __syscall_ret(r);
  30         if (!IS32BIT(s0) || !IS32BIT(s1))
  31                 return __syscall_ret(-ENOTSUP);
  32         r = __syscall(SYS_utimensat, fd, path,
  33                 times ? ((long[]){s0, ns0, s1, ns1}) : 0, flags);
  34 #else
  35         r = __syscall(SYS_utimensat, fd, path, times, flags);
  36 #endif
  37
  38 #ifdef SYS_futimesat
  39         if (r != -ENOSYS || flags) return __syscall_ret(r);
  40         long *tv=0, tmp[4];
  41         if (times) {
  42                 int i;
  43                 tv = tmp;
  44                 for (i=0; i<2; i++) {
  45                         if (times[i].tv_nsec >= 1000000000ULL) {
  46                                 if (NS_SPECIAL(times[i].tv_nsec))
  47                                         return __syscall_ret(-ENOSYS);
  48                                 return __syscall_ret(-EINVAL);
  49                         }
  50                         tmp[2*i+0] = times[i].tv_sec;
  51                         tmp[2*i+1] = times[i].tv_nsec / 1000;
  52                 }
  53         }
  54
  55         r = __syscall(SYS_futimesat, fd, path, tv);
  56         if (r != -ENOSYS || fd != AT_FDCWD) return __syscall_ret(r);
  57         r = __syscall(SYS_utimes, path, tv);
  58 #endif
  59         return __syscall_ret(r);
  60 }