git.m6w6.name Git - m6w6/ext-psi/blob - src/dl.h

   1 /*******************************************************************************
   2  Copyright (c) 2018, Michael Wallner <mike@php.net>.
   3  All rights reserved.
   4
   5  Redistribution and use in source and binary forms, with or without
   6  modification, are permitted provided that the following conditions are met:
   7
   8      * Redistributions of source code must retain the above copyright notice,
   9        this list of conditions and the following disclaimer.
  10      * Redistributions in binary form must reproduce the above copyright
  11        notice, this list of conditions and the following disclaimer in the
  12        documentation and/or other materials provided with the distribution.
  13
  14  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  15  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  18  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  21  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  22  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24 *******************************************************************************/
  25
  26 #ifndef PSI_DLSYM_H
  27 #define PSI_DLSYM_H
  28
  29 #include <stddef.h>
  30 #include <dlfcn.h>
  31
  32 #ifndef RTLD_NEXT
  33 # define RTLD_NEXT ((void *) -1l)
  34 #endif
  35 #ifndef RTLD_DEFAULT
  36 # define RTLD_DEFAULT ((void *) 0)
  37 #endif
  38
  39 #include "plist.h"
  40
  41 static inline void *psi_dlsym(struct psi_plist *dllist, const char *name, const char *redir)
  42 {
  43         void *dl, *sym = NULL;
  44         const char *test = redir ?: name;
  45
  46 again:
  47         if (dllist) {
  48                 size_t i = 0;
  49
  50                 while (!sym && psi_plist_get(dllist, i++, &dl)) {
  51                         sym = dlsym(dl, test);
  52                 }
  53         }
  54         if (!sym) {
  55                 sym = dlsym(RTLD_DEFAULT, test);
  56         }
  57         if (!sym && test == redir) {
  58                 test = name;
  59                 goto again;
  60         }
  61
  62         return sym;
  63 }
  64
  65 static inline size_t psi_dlname(char (*buf)[], size_t *len, const char *libname)
  66 {
  67         if (strchr(libname, '/')) {
  68                 return snprintf(*buf, *len, "%s", libname);
  69         } else {
  70                 return snprintf(*buf, *len, "lib%s.%s", libname, PHP_PSI_SHLIB_SUFFIX);
  71         }
  72 }
  73
  74 static inline void *psi_dlopen(const char *libname)
  75 {
  76         return dlopen(libname, RTLD_LAZY | RTLD_LOCAL);
  77 }
  78
  79 static inline void psi_dlclose(void *dl)
  80 {
  81         dlclose(dl);
  82 }
  83
  84 static inline char *psi_dlerror()
  85 {
  86         return dlerror();
  87 }
  88
  89 #endif /* PSI_DLSYM_H */