add setxid.c for new set*id() framework. missed in last commit.

[oweals/musl.git] / src / linux / sbrk.c

diff --git a/src/linux/sbrk.c b/src/linux/sbrk.c
index b2943a9239533967b1f8468dc607804b31335b0d..5fab74be29c83d729c5718d13f5106a1cd9be41d 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;
 }