1 #include <sys/cdefs.h> 2 #include "namespace.h" 3 #include <lib.h> 4 5 #include <unistd.h> 6 7 #ifdef __weak_alias 8 __weak_alias(sbrk, _sbrk) 9 #endif 10 11 extern char *_brksize; 12 13 void *sbrk(incr) 14 intptr_t incr; 15 { 16 char *newsize, *oldsize; 17 18 oldsize = _brksize; 19 newsize = _brksize + incr; 20 if ((incr > 0 && newsize < oldsize) || (incr < 0 && newsize > oldsize)) 21 return( (char *) -1); 22 if (brk(newsize) == 0) 23 return(oldsize); 24 else 25 return( (char *) -1); 26 } 27