93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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* Misc. functions for systems that don't have them
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*
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* Copyright 1996 Alexandre Julliard
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#ifndef HAVE_USLEEP
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#ifdef __EMX__
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unsigned int usleep (unsigned int useconds) { DosSleep(useconds); }
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#else
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unsigned int usleep (unsigned int useconds)
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{
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struct timeval delay;
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delay.tv_sec = 0;
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delay.tv_usec = useconds;
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select( 0, 0, 0, 0, &delay );
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return 0;
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}
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#endif
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#endif /* HAVE_USLEEP */
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#ifndef HAVE_MEMMOVE
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void *memmove( void *dest, const void *src, unsigned int len )
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{
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register char *dst = dest;
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/* Use memcpy if not overlapping */
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if ((dst + len <= (char *)src) || ((char *)src + len <= dst))
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{
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memcpy( dst, src, len );
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}
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/* Otherwise do it the hard way (FIXME: could do better than this) */
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else if (dst < src)
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{
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while (len--) *dst++ = *((char *)src)++;
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}
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else
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{
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dst += len - 1;
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src = (char *)src + len - 1;
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while (len--) *dst-- = *((char *)src)--;
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}
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return dest;
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}
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#endif /* HAVE_MEMMOVE */
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#ifndef HAVE_STRERROR
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const char *strerror( int err )
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{
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/* Let's hope we have sys_errlist then */
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return sys_errlist[err];
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}
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#endif /* HAVE_STRERROR */
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#if !defined(HAVE_CLONE) && defined(__linux__)
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#include <assert.h>
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#include <errno.h>
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#include <syscall.h>
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int clone( int (*fn)(void *), void *stack, int flags, void *arg )
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{
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#ifdef __i386__
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int ret;
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void **stack_ptr = (void **)stack;
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*--stack_ptr = arg; /* Push argument on stack */
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*--stack_ptr = fn; /* Push function pointer (popped into ebx) */
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__asm__ __volatile__( "pushl %%ebx\n\t"
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"movl %2,%%ebx\n\t"
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"int $0x80\n\t"
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"popl %%ebx\n\t" /* Contains fn in the child */
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"testl %%eax,%%eax\n\t"
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"jnz 0f\n\t"
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"call *%%ebx\n\t" /* Should never return */
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"xorl %%eax,%%eax\n\t" /* Just in case it does*/
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"0:"
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: "=a" (ret)
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: "0" (SYS_clone), "g" (flags), "c" (stack_ptr) );
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assert( ret ); /* If ret is 0, we returned from the child function */
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if (ret > 0) return ret;
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errno = -ret;
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return -1;
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#else
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errno = EINVAL;
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return -1;
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#endif /* __i386__ */
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}
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#endif /* !HAVE_CLONE && __linux__ */
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