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rtld_lock.h: add some comments about versioning of struct RtldLockInfo

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Sponsored by:	The FreeBSD Foundation
MFC after:	6 days
This commit is contained in:
Konstantin Belousov 2021-04-11 11:12:48 +03:00
parent 1a4e959eb3
commit 9b33518ada
1 changed files with 13 additions and 0 deletions
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13
libexec/rtld-elf/rtld_lock.h
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@ -35,9 +35,20 @@
#define MAX_RTLD_LOCKS 8
/*
* This structure is part of the ABI between rtld and threading
* libraries, like libthr and even libc_r. Its layout is fixed and
* can be changed only by appending new fields at the end, with the
* bump of RTLI_VERSION.
*/
struct RtldLockInfo
{
/*
* Valid if the object calling _rtld_thread_init() exported
* symbol _pli_rtli_version. Otherwise assume RTLI_VERSION_ONE.
*/
unsigned int rtli_version;
void *(*lock_create)(void);
void (*lock_destroy)(void *);
void (*rlock_acquire)(void *);
@ -46,6 +57,8 @@ struct RtldLockInfo
int (*thread_set_flag)(int);
int (*thread_clr_flag)(int);
void (*at_fork)(void);
/* Version 2 fields */
char *(*dlerror_loc)(void);
int *(*dlerror_seen)(void);
int dlerror_loc_sz;