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fix brk/sbrk behavior to match the real legacy functions

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This commit is contained in:
Rich Felker 2011-05-22 12:34:33 -04:00
commit 19892bf0a7
2 changed files with 4 additions and 2 deletions
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2
src/linux/brk.c
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@ -2,5 +2,5 @@
int brk(void *end) int brk(void *end)
{ {
return -(syscall(SYS_brk, end) == -1); return -(syscall(SYS_brk, end) != (unsigned long)end);
} }

4
src/linux/sbrk.c
View file

@ -3,5 +3,7 @@
void *sbrk(ptrdiff_t inc) 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;
} }