28. 7. 7. 41 mysql _library _init ()

Call this function to initialize the MySQL client library before you call any other MySQL function.

In a nonmultithreaded environment, the call to mysql_library_init() may be omitted, because mysql_init() will invoke it automatically as necessary. However, mysql_library_init() is not thread-safe in a multithreaded environment, and thus neither is mysql_init(), which calls mysql_library_init(). You must either call mysql_library_init() prior to spawning any threads, or else use a mutex to protect the call, whether you invoke mysql_library_init() or indirectly through mysql_init(). Do this prior to any other client library call.

The argc, argv, and groups arguments are unused. In older MySQL versions, they were used for applications linked against the embedded server, which is no longer supported. The call now should be written as mysql_library_init(0, NULL, NULL).

#include <mysql.h>
#include <stdlib.h>

int main(void) {
  if (mysql_library_init(0, NULL, NULL)) {
    fprintf(stderr, "could not initialize MySQL client library\n");
    exit(1);
  }

  /* Use any MySQL API functions here */

  mysql_library_end();

  return EXIT_SUCCESS;
}

Zero for success. Nonzero if an error occurred.