File: __sbrk.c

package info (click to toggle)
libc-sparc 5.3.12-2
  • links: PTS
  • area: main
  • in suites: hamm
  • size: 18,664 kB
  • ctags: 53,237
  • sloc: ansic: 181,379; asm: 5,080; makefile: 3,340; lex: 521; sh: 439; yacc: 401; awk: 28
file content (33 lines) | stat: -rw-r--r-- 610 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
#include <unistd.h>
#include <sys/syscall.h>
#include <errno.h>

extern void * ___brk_addr;

extern int __init_brk (void);

void *
__sbrk(ptrdiff_t increment)
{
    if (__init_brk () == 0)
    {
	void * tmp = ___brk_addr+increment;
	__asm__ volatile ("or %%g0, %1, %%g1\n\t"
			  "or %%g0, %2, %%o0\n\t"
			  "t 0x10\n\t"
			  "mov %%o0, %0\n\t"
		:"=r" (___brk_addr)
		:"0" (SYS_brk),"r" (tmp) : "g1", "o0");
	if (___brk_addr == tmp)
		return tmp-increment;
	errno = ENOMEM;
	return ((void *) -1);
    }
    return ((void *) -1);
}


#include <gnu-stabs.h>
#ifdef weak_alias
weak_alias (__sbrk, sbrk);
#endif