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redo cond vars again, use sequence numbers
[musl]
/
src
/
linux
/
sbrk.c
diff --git
a/src/linux/sbrk.c
b/src/linux/sbrk.c
index
b2943a9
..
5fab74b
100644
(file)
--- a/
src/linux/sbrk.c
+++ b/
src/linux/sbrk.c
@@
-3,5
+3,7
@@
void *sbrk(ptrdiff_t inc)
{
- return (void *)syscall(SYS_brk, syscall(SYS_brk, 0)+inc);
+ unsigned long cur = syscall(SYS_brk, 0);
+ if (inc && syscall(SYS_brk, cur+inc) != cur+inc) return (void *)-1;
+ return (void *)cur;
}