path: root/include/setjmp.h
diff options
authorRich Felker <>2013-07-24 02:17:02 -0400
committerRich Felker <>2013-07-24 02:17:02 -0400
commit9693501c158d68431962938cb02e7d8d2ef89ca3 (patch)
tree2596b176d5dfe6f05854a86286d52d2a233b0354 /include/setjmp.h
parent4a30ba5ca4072e85e42e84547572e958871952a2 (diff)
change jmp_buf to share an underlying type and struct tag with sigjmp_buf
this is necessary to meet the C++ ABI target. alternatives were considered to avoid the size increase for non-sig jmp_buf objects, but they seemed to have worse properties. moreover, the relative size increase is only extreme on x86[_64]; one way of interpreting this is that, if the size increase from this patch makes jmp_buf use too much memory, then the program was already using too much memory when built for non-x86 archs.
Diffstat (limited to 'include/setjmp.h')
1 files changed, 6 insertions, 7 deletions
diff --git a/include/setjmp.h b/include/setjmp.h
index 5456d8f8..0da27de6 100644
--- a/include/setjmp.h
+++ b/include/setjmp.h
@@ -9,27 +9,26 @@ extern "C" {
#include <bits/setjmp.h>
+typedef struct __jmp_buf_tag {
+ __jmp_buf __jb;
+ unsigned long __fl;
+ unsigned long __ss[128/sizeof(long)];
+} jmp_buf[1];
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
-typedef struct __sigjmp_buf {
- jmp_buf __jb;
- unsigned long __fl;
- unsigned long __ss[128/sizeof(long)];
-} sigjmp_buf[1];
+typedef jmp_buf sigjmp_buf;
int sigsetjmp (sigjmp_buf, int);
_Noreturn void siglongjmp (sigjmp_buf, int);
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
int _setjmp (jmp_buf);
_Noreturn void _longjmp (jmp_buf, int);
int setjmp (jmp_buf);
_Noreturn void longjmp (jmp_buf, int);