misc/port.c

   1 /*
   2  * Misc. functions for systems that don't have them
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8 #include <sys/types.h>
   9 #include <sys/time.h>
  10 #include <sys/stat.h>
  11 #include <sys/ioctl.h>
  12 #include <errno.h>
  13 #include <fcntl.h>
  14 #include <termios.h>
  15 #ifdef HAVE_LIBIO_H
  16 # include <libio.h>
  17 #endif
  18
  19 #ifndef HAVE_USLEEP
  20 #ifdef __EMX__
  21 unsigned int usleep (unsigned int useconds) { DosSleep(useconds); }
  22 #else
  23 unsigned int usleep (unsigned int useconds)
  24 {
  25     struct timeval delay;
  26
  27     delay.tv_sec = 0;
  28     delay.tv_usec = useconds;
  29
  30     select( 0, 0, 0, 0, &delay );
  31     return 0;
  32 }
  33 #endif
  34 #endif /* HAVE_USLEEP */
  35
  36 #ifndef HAVE_MEMMOVE
  37 void *memmove( void *dest, const void *src, unsigned int len )
  38 {
  39     register char *dst = dest;
  40
  41     /* Use memcpy if not overlapping */
  42     if ((dst + len <= (char *)src) || ((char *)src + len <= dst))
  43     {
  44         memcpy( dst, src, len );
  45     }
  46     /* Otherwise do it the hard way (FIXME: could do better than this) */
  47     else if (dst < src)
  48     {
  49         while (len--) *dst++ = *((char *)src)++;
  50     }
  51     else
  52     {
  53         dst += len - 1;
  54         src = (char *)src + len - 1;
  55         while (len--) *dst-- = *((char *)src)--;
  56     }
  57     return dest;
  58 }
  59 #endif  /* HAVE_MEMMOVE */
  60
  61 #ifndef HAVE_STRERROR
  62 const char *strerror( int err )
  63 {
  64     /* Let's hope we have sys_errlist then */
  65     return sys_errlist[err];
  66 }
  67 #endif  /* HAVE_STRERROR */
  68
  69 #if !defined(HAVE_CLONE) && defined(__linux__)
  70 #include <assert.h>
  71 #include <errno.h>
  72 #include <syscall.h>
  73 int clone( int (*fn)(void *), void *stack, int flags, void *arg )
  74 {
  75 #ifdef __i386__
  76     int ret;
  77     void **stack_ptr = (void **)stack;
  78     *--stack_ptr = arg;  /* Push argument on stack */
  79     *--stack_ptr = fn;   /* Push function pointer (popped into ebx) */
  80     __asm__ __volatile__( "pushl %%ebx\n\t"
  81                           "movl %2,%%ebx\n\t"
  82                           "int $0x80\n\t"
  83                           "popl %%ebx\n\t"   /* Contains fn in the child */
  84                           "testl %%eax,%%eax\n\t"
  85                           "jnz 0f\n\t"
  86                           "call *%%ebx\n\t"       /* Should never return */
  87                           "xorl %%eax,%%eax\n\t"  /* Just in case it does*/
  88                           "0:"
  89                           : "=a" (ret)
  90                           : "0" (SYS_clone), "g" (flags), "c" (stack_ptr) );
  91     assert( ret );  /* If ret is 0, we returned from the child function */
  92     if (ret > 0) return ret;
  93     errno = -ret;
  94     return -1;
  95 #else
  96     errno = EINVAL;
  97     return -1;
  98 #endif  /* __i386__ */
  99 }
 100 #endif  /* !HAVE_CLONE && __linux__ */
 101
 102
 103 /**
 104  *  It looks like the openpty that comes with glibc in RedHat 5.0
 105  *  is buggy (second call returns what looks like a dup of 0 and 1
 106  *  instead of a new pty), this is a generic replacement.
 107  */
 108 /** We will have an autoconf check for this soon... */
 109
 110 int wine_openpty(int *master, int *slave, char *name,
 111                         struct termios *term, struct winsize *winsize)
 112 {
 113     char *ptr1, *ptr2;
 114     char pts_name[512];
 115
 116     strcpy (pts_name, "/dev/ptyXY");
 117
 118     for (ptr1 = "pqrstuvwxyzPQRST"; *ptr1 != 0; ptr1++) {
 119         pts_name[8] = *ptr1;
 120         for (ptr2 = "0123456789abcdef"; *ptr2 != 0; ptr2++) {
 121             pts_name[9] = *ptr2;
 122
 123             if ((*master = open(pts_name, O_RDWR)) < 0) {
 124                 if (errno == ENOENT)
 125                     return -1;
 126                 else
 127                     continue;
 128             }
 129             pts_name[5] = 't';
 130             if ((*slave = open(pts_name, O_RDWR)) < 0) {
 131                 pts_name[5] = 'p';
 132                 continue;
 133             }
 134
 135             if (term != NULL)
 136                 tcsetattr(*slave, TCSANOW, term);
 137             if (winsize != NULL)
 138                 ioctl(*slave, TIOCSWINSZ, winsize);
 139             if (name != NULL)
 140                 strcpy(name, pts_name);
 141             return *slave;
 142         }
 143     }
 144     return -1;
 145 }
 146