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 <stdio.h>
   9 #include <sys/types.h>
  10 #include <sys/time.h>
  11 #include <sys/stat.h>
  12 #include <sys/ioctl.h>
  13 #include <errno.h>
  14 #include <fcntl.h>
  15 #include <termios.h>
  16 #ifdef HAVE_LIBIO_H
  17 # include <libio.h>
  18 #endif
  19
  20 #ifndef HAVE_USLEEP
  21 #ifdef __EMX__
  22 unsigned int usleep (unsigned int useconds) { DosSleep(useconds); }
  23 #else
  24 unsigned int usleep (unsigned int useconds)
  25 {
  26     struct timeval delay;
  27
  28     delay.tv_sec = 0;
  29     delay.tv_usec = useconds;
  30
  31     select( 0, 0, 0, 0, &delay );
  32     return 0;
  33 }
  34 #endif
  35 #endif /* HAVE_USLEEP */
  36
  37 #ifndef HAVE_MEMMOVE
  38 void *memmove( void *dest, const void *src, unsigned int len )
  39 {
  40     register char *dst = dest;
  41
  42     /* Use memcpy if not overlapping */
  43     if ((dst + len <= (char *)src) || ((char *)src + len <= dst))
  44     {
  45         memcpy( dst, src, len );
  46     }
  47     /* Otherwise do it the hard way (FIXME: could do better than this) */
  48     else if (dst < src)
  49     {
  50         while (len--) *dst++ = *((char *)src)++;
  51     }
  52     else
  53     {
  54         dst += len - 1;
  55         src = (char *)src + len - 1;
  56         while (len--) *dst-- = *((char *)src)--;
  57     }
  58     return dest;
  59 }
  60 #endif  /* HAVE_MEMMOVE */
  61
  62 #ifndef HAVE_STRERROR
  63 const char *strerror( int err )
  64 {
  65     /* Let's hope we have sys_errlist then */
  66     return sys_errlist[err];
  67 }
  68 #endif  /* HAVE_STRERROR */
  69
  70 #if !defined(HAVE_CLONE) && defined(__linux__)
  71 #include <assert.h>
  72 #include <errno.h>
  73 #include <syscall.h>
  74 int clone( int (*fn)(void *), void *stack, int flags, void *arg )
  75 {
  76 #ifdef __i386__
  77     int ret;
  78     void **stack_ptr = (void **)stack;
  79     *--stack_ptr = arg;  /* Push argument on stack */
  80     *--stack_ptr = fn;   /* Push function pointer (popped into ebx) */
  81     __asm__ __volatile__( "pushl %%ebx\n\t"
  82                           "movl %2,%%ebx\n\t"
  83                           "int $0x80\n\t"
  84                           "popl %%ebx\n\t"   /* Contains fn in the child */
  85                           "testl %%eax,%%eax\n\t"
  86                           "jnz 0f\n\t"
  87                           "call *%%ebx\n\t"       /* Should never return */
  88                           "xorl %%eax,%%eax\n\t"  /* Just in case it does*/
  89                           "0:"
  90                           : "=a" (ret)
  91                           : "0" (SYS_clone), "r" (flags), "c" (stack_ptr) );
  92     assert( ret );  /* If ret is 0, we returned from the child function */
  93     if (ret > 0) return ret;
  94     errno = -ret;
  95     return -1;
  96 #else
  97     errno = EINVAL;
  98     return -1;
  99 #endif  /* __i386__ */
 100 }
 101 #endif  /* !HAVE_CLONE && __linux__ */
 102
 103
 104 /**
 105  *  It looks like the openpty that comes with glibc in RedHat 5.0
 106  *  is buggy (second call returns what looks like a dup of 0 and 1
 107  *  instead of a new pty), this is a generic replacement.
 108  */
 109 /** We will have an autoconf check for this soon... */
 110
 111 int wine_openpty(int *master, int *slave, char *name,
 112                         struct termios *term, struct winsize *winsize)
 113 {
 114     char *ptr1, *ptr2;
 115     char pts_name[512];
 116
 117     strcpy (pts_name, "/dev/ptyXY");
 118
 119     for (ptr1 = "pqrstuvwxyzPQRST"; *ptr1 != 0; ptr1++) {
 120         pts_name[8] = *ptr1;
 121         for (ptr2 = "0123456789abcdef"; *ptr2 != 0; ptr2++) {
 122             pts_name[9] = *ptr2;
 123
 124             if ((*master = open(pts_name, O_RDWR)) < 0) {
 125                 if (errno == ENOENT)
 126                     return -1;
 127                 else
 128                     continue;
 129             }
 130             pts_name[5] = 't';
 131             if ((*slave = open(pts_name, O_RDWR)) < 0) {
 132                 pts_name[5] = 'p';
 133                 continue;
 134             }
 135
 136             if (term != NULL)
 137                 tcsetattr(*slave, TCSANOW, term);
 138             if (winsize != NULL)
 139                 ioctl(*slave, TIOCSWINSZ, winsize);
 140             if (name != NULL)
 141                 strcpy(name, pts_name);
 142             return *slave;
 143         }
 144     }
 145     return -1;
 146 }
 147