granicus.if.org Git - strace/blob - readlink.c

   1 #include "defs.h"
   2
   3 static int
   4 decode_readlink(struct tcb *tcp, int offset)
   5 {
   6         if (entering(tcp)) {
   7                 printpath(tcp, tcp->u_arg[offset]);
   8                 tprints(", ");
   9         } else {
  10                 if (syserror(tcp))
  11                         tprintf("%#lx", tcp->u_arg[offset + 1]);
  12                 else
  13                         /* Used to use printpathn(), but readlink
  14                          * neither includes NUL in the returned count,
  15                          * nor actually writes it into memory.
  16                          * printpathn() would decide on printing
  17                          * "..." continuation based on garbage
  18                          * past return buffer's end.
  19                          */
  20                         printstr(tcp, tcp->u_arg[offset + 1], tcp->u_rval);
  21                 tprintf(", %lu", tcp->u_arg[offset + 2]);
  22         }
  23         return 0;
  24 }
  25
  26 int
  27 sys_readlink(struct tcb *tcp)
  28 {
  29         return decode_readlink(tcp, 0);
  30 }
  31
  32 int
  33 sys_readlinkat(struct tcb *tcp)
  34 {
  35         if (entering(tcp))
  36                 print_dirfd(tcp, tcp->u_arg[0]);
  37         return decode_readlink(tcp, 1);
  38 }