src/basic/dlfcn-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "dlfcn-util.h"
   4
   5 int dlsym_many_and_warn(void *dl, int level, ...) {
   6         va_list ap;
   7         int r;
   8
   9         /* Tries to resolve a bunch of function symbols, and logs errors about the ones it cannot
  10          * resolve. Note that this function possibly modifies the supplied function pointers if the whole
  11          * operation fails */
  12
  13         va_start(ap, level);
  14
  15         for (;;) {
  16                 void (**fn)(void);
  17                 void (*tfn)(void);
  18                 const char *symbol;
  19
  20                 fn = va_arg(ap, typeof(fn));
  21                 if (!fn)
  22                         break;
  23
  24                 symbol = va_arg(ap, typeof(symbol));
  25
  26                 tfn = (typeof(tfn)) dlsym(dl, symbol);
  27                 if (!tfn) {
  28                         r = log_full_errno(level,
  29                                            SYNTHETIC_ERRNO(ELIBBAD),
  30                                            "Can't find symbol %s: %s", symbol, dlerror());
  31                         va_end(ap);
  32                         return r;
  33                 }
  34
  35                 *fn = tfn;
  36         }
  37
  38         va_end(ap);
  39         return 0;
  40 }