From 6c33b742ce19cc2fd226d84f2991572239199a62 Mon Sep 17 00:00:00 2001 From: Nick Alcock Date: Wed, 24 Apr 2019 11:26:42 +0100 Subject: libctf: library version enforcement This old Solaris standard allows callers to specify that they are expecting one particular API and/or CTF file format from the library. libctf/ * ctf-impl.h (_libctf_version): New declaration. * ctf-subr.c (_libctf_version): Define it. (ctf_version): New. include/ * ctf-api.h (ctf_version): New. --- libctf/ChangeLog | 6 ++++++ libctf/ctf-impl.h | 1 + libctf/ctf-subr.c | 27 +++++++++++++++++++++++++++ 3 files changed, 34 insertions(+) (limited to 'libctf') diff --git a/libctf/ChangeLog b/libctf/ChangeLog index c0c98d2..a6eb11e 100644 --- a/libctf/ChangeLog +++ b/libctf/ChangeLog @@ -1,5 +1,11 @@ 2019-05-28 Nick Alcock + * ctf-impl.h (_libctf_version): New declaration. + * ctf-subr.c (_libctf_version): Define it. + (ctf_version): New. + +2019-05-28 Nick Alcock + * ctf-create.c (enumcmp): New. (enumadd): Likewise. (membcmp): Likewise. diff --git a/libctf/ctf-impl.h b/libctf/ctf-impl.h index ff18504..363b62d 100644 --- a/libctf/ctf-impl.h +++ b/libctf/ctf-impl.h @@ -375,6 +375,7 @@ extern const char *ctf_lookup_symbol_name (ctf_file_t *fp, unsigned long symidx) extern const char _CTF_SECTION[]; /* name of CTF ELF section */ extern const char _CTF_NULLSTR[]; /* empty string */ +extern int _libctf_version; /* library client version */ extern int _libctf_debug; /* debugging messages enabled */ #ifdef __cplusplus diff --git a/libctf/ctf-subr.c b/libctf/ctf-subr.c index 3103e28..09ec295 100644 --- a/libctf/ctf-subr.c +++ b/libctf/ctf-subr.c @@ -27,6 +27,7 @@ #include static size_t _PAGESIZE _libctf_unused_; +int _libctf_version = CTF_VERSION; /* Library client version. */ int _libctf_debug = 0; /* Debugging messages enabled. */ _libctf_malloc_ void * @@ -190,6 +191,32 @@ ctf_strerror (int err) return (const char *) (strerror (err)); } +/* Set the CTF library client version to the specified version. If version is + zero, we just return the default library version number. */ +int +ctf_version (int version) +{ + if (version < 0) + { + errno = EINVAL; + return -1; + } + + if (version > 0) + { + /* Dynamic version switching is not presently supported. */ + if (version != CTF_VERSION) + { + errno = ENOTSUP; + return -1; + } + ctf_dprintf ("ctf_version: client using version %d\n", version); + _libctf_version = version; + } + + return _libctf_version; +} + void libctf_init_debug (void) { -- cgit v1.1