sysdeps/nacl/xstat64.c

   1
   2 #include <errno.h>
   3 #include <stddef.h>
   4 #include <string.h>
   5 #include <sys/stat.h>
   6
   7 #include <nacl_rpc.h>
   8 #include <nacl_syscalls.h>
   9
  10
  11 int __have_no_stat64; /* Needed by fxstatat.c */
  12
  13
  14 int ___xstat64 (int vers, const char *filename, struct stat64 *buf)
  15 {
  16   struct NaClImcMsgIoVec iov;
  17   struct NaClImcMsgHdr msg;
  18   int filename_len = strlen(filename);
  19   char *msg_data = alloca(4 + filename_len);
  20   memcpy(msg_data, "Stat", 4);
  21   memcpy(msg_data + 4, filename, filename_len);
  22   iov.base = msg_data;
  23   iov.length = 4 + filename_len;
  24   msg.iov = &iov;
  25   msg.iov_length = 1;
  26   msg.descv = NULL;
  27   msg.desc_length = 0;
  28   if(imc_sendmsg(NACL_COMMS_FD, &msg, 0) < 0)
  29     return -1;
  30
  31   int no_fields = 16;
  32   char recv_data[4 + 4*no_fields + 10];
  33   iov.base = recv_data;
  34   iov.length = sizeof(recv_data);
  35   msg.descv = NULL;
  36   msg.desc_length = 0;
  37   int got = imc_recvmsg(NACL_COMMS_FD, &msg, 0);
  38   if(got == 4 + 4*no_fields && memcmp(recv_data, "Rsta", 4) == 0) {
  39     int *fields = (int *) (recv_data + 4);
  40     buf->st_dev = fields[0];
  41     buf->st_ino = fields[1];
  42     buf->st_mode = fields[2];
  43     buf->st_nlink = fields[3];
  44     buf->st_uid = fields[4];
  45     buf->st_gid = fields[5];
  46     buf->st_rdev = fields[6];
  47     buf->st_size = fields[7];
  48     buf->st_blksize = fields[8];
  49     buf->st_blocks = fields[9];
  50     buf->st_atim.tv_sec = fields[10];
  51     buf->st_atim.tv_nsec = fields[11];
  52     buf->st_mtim.tv_sec = fields[12];
  53     buf->st_mtim.tv_nsec = fields[13];
  54     buf->st_ctim.tv_sec = fields[14];
  55     buf->st_ctim.tv_nsec = fields[15];
  56     return 0;
  57   }
  58   else {
  59     errno = ENOENT;
  60     return -1;
  61   }
  62 }
  63
  64 #include <shlib-compat.h>
  65
  66 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  67 versioned_symbol (libc, ___xstat64, __xstat64, GLIBC_2_2);
  68 strong_alias (___xstat64, __old__xstat64)
  69 compat_symbol (libc, __old__xstat64, __xstat64, GLIBC_2_1);
  70 hidden_ver (___xstat64, __xstat64)
  71 #else
  72 strong_alias (___xstat64, __xstat64)
  73 hidden_def (__xstat64)
  74 #endif