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musl/include/setjmp.h

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initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#ifndef _SETJMP_H
#define _SETJMP_H
#ifdef __cplusplus
extern "C" {
#endif
default features: make musl usable without feature test macros the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change.
2012-09-08 03:13:55 +00:00
#include <features.h>
add _Noreturn function attribute, with fallback for pre-C11 GNUC
2012-09-07 03:12:27 +00:00
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#include <bits/setjmp.h>
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.
2013-07-24 06:17:02 +00:00
typedef struct __jmp_buf_tag {
__jmp_buf __jb;
unsigned long __fl;
unsigned long __ss[128/sizeof(long)];
} jmp_buf[1];
extensive header cleanup for standards conformance & correctness thanks to Peter Mazinger (psm) for pointing many of these issues out and submitting a patch on which this commit is loosely based
2011-02-14 23:41:25 +00:00
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
support _BSD_SOURCE feature test macro patch by Isaac Dunham. matched closely (maybe not exact) to glibc's idea of what _BSD_SOURCE should make visible.
2012-05-23 01:52:08 +00:00
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
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.
2013-07-24 06:17:02 +00:00
typedef jmp_buf sigjmp_buf;
extensive header cleanup for standards conformance & correctness thanks to Peter Mazinger (psm) for pointing many of these issues out and submitting a patch on which this commit is loosely based
2011-02-14 23:41:25 +00:00
int sigsetjmp (sigjmp_buf, int);
further use of _Noreturn, for non-plain-C functions note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
2012-09-07 03:34:10 +00:00
_Noreturn void siglongjmp (sigjmp_buf, int);
extensive header cleanup for standards conformance & correctness thanks to Peter Mazinger (psm) for pointing many of these issues out and submitting a patch on which this commit is loosely based
2011-02-14 23:41:25 +00:00
#endif
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
support _BSD_SOURCE feature test macro patch by Isaac Dunham. matched closely (maybe not exact) to glibc's idea of what _BSD_SOURCE should make visible.
2012-05-23 01:52:08 +00:00
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
int _setjmp (jmp_buf);
further use of _Noreturn, for non-plain-C functions note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
2012-09-07 03:34:10 +00:00
_Noreturn void _longjmp (jmp_buf, int);
extensive header cleanup for standards conformance & correctness thanks to Peter Mazinger (psm) for pointing many of these issues out and submitting a patch on which this commit is loosely based
2011-02-14 23:41:25 +00:00
#endif
int setjmp (jmp_buf);
add _Noreturn function attribute, with fallback for pre-C11 GNUC
2012-09-07 03:12:27 +00:00
_Noreturn void longjmp (jmp_buf, int);
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#define setjmp setjmp
#ifdef __cplusplus
}
#endif
#endif