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add support for RTLD_NOLOAD to dlopen 

based on patch by Pierre Carrier <pierre@gcarrier.fr> that just added
the flag constant, but with minimal additional code so that it
actually works as documented. this is a nonstandard option but some
major software (reportedly, Firefox) uses it and it was easy to add
anyway.
This commit is contained in:
Rich Felker 2013-01-23 22:07:45 -05:00
parent 637dd2d383
commit 4d07e5521e
2 changed files with 8 additions and 3 deletions
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1
include/dlfcn.h
View File

@ -9,6 +9,7 @@ extern "C" {
#define RTLD_LAZY 1
#define RTLD_NOW 2
#define RTLD_NOLOAD 4
#define RTLD_GLOBAL 256
#define RTLD_LOCAL 0

10
src/ldso/dynlink.c
View File

@ -99,6 +99,7 @@ static int ssp_used;
static int runtime;
static int ldd_mode;
static int ldso_fail;
static int noload;
static jmp_buf rtld_fail;
static pthread_rwlock_t lock;
static struct debug debug;
@ -508,7 +509,7 @@ static struct dso *load_library(const char *name)
return p;
}
}
map = map_library(fd, &temp_dso);
map = noload ? 0 : map_library(fd, &temp_dso);
close(fd);
if (!map) return 0;
@ -1027,6 +1028,7 @@ void *dlopen(const char *file, int mode)
orig_tls_offset = tls_offset;
orig_tls_align = tls_align;
orig_tail = tail;
noload = mode & RTLD_NOLOAD;
if (setjmp(rtld_fail)) {
/* Clean up anything new that was (partially) loaded */
@ -1050,8 +1052,10 @@ void *dlopen(const char *file, int mode)
} else p = load_library(file);
if (!p) {
snprintf(errbuf, sizeof errbuf,
"Error loading shared library %s: %m", file);
snprintf(errbuf, sizeof errbuf, noload ?
"Library %s is not already loaded" :
"Error loading shared library %s: %m",
file);
errflag = 1;
goto end;
}