memcheck/tests/freebsd/openpty.c

   1 /* Build with cc -lutil valgrind-ptsname.c */
   2
   3 #include <sys/types.h>
   4 #include <sys/ioctl.h>
   5
   6 #include <unistd.h>
   7 #include <termios.h>
   8
   9 #include <libutil.h>
  10
  11 /*
  12  * ==18203== Syscall param ioctl(generic) points to uninitialised byte(s)
  13  * ==18203==    at 0x49AAE7A: ioctl (in /lib/libc.so.7)
  14  * ==18203==    by 0x490C116: fdevname_r (in /lib/libc.so.7)
  15  * ==18203==    by 0x49E1567: ptsname (in /lib/libc.so.7)
  16  * ==18203==    by 0x486B5E2: openpty (in /lib/libutil.so.9)
  17  * ==18203==    by 0x2016E6: main (in /tmp/a.out)
  18  * ==18203==  Address 0x1ffc000a74 is on thread 1's stack
  19  * ==18203==  in frame #1, created by fdevname_r (???:)
  20  */
  21
  22 #if 0
  23 /* Relevant bit from lib/libc/gen/fdevname.c */
  24 char *
  25 fdevname_r(int fd, char *buf, int len)
  26 {
  27    struct fiodgname_arg fgn;
  28
  29    /*
  30     * buf here points to a `static` buffer in ptsname.c, these are the only
  31     * two members of fiodgname_arg.
  32     */
  33    fgn.buf = buf;
  34    fgn.len = len;
  35
  36    if (_ioctl(fd, FIODGNAME, &fgn) == -1)
  37       return (NULL);
  38    return (buf);
  39 }
  40 #endif
  41
  42 int
  43 main()
  44 {
  45    int master, slave;
  46
  47    (void)openpty(&master, &slave, NULL, NULL, NULL);
  48
  49    return (0);
  50 }
  51