ruby--ruby/rubystub.c

#include "internal.h"
#include "internal/missing.h"
#if defined HAVE_DLADDR
#include <dlfcn.h>
#endif
#if defined HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
static void* stub_options(int argc, char **argv);
#define ruby_options stub_options
#include <main.c>
#undef ruby_options

void *
stub_options(int argc, char **argv)
{
    char xflag[] = "-x";
    char *xargv[4] = {NULL, xflag};
    char *cmd = argv[0];
    void *ret;

#if defined __CYGWIN__ || defined _WIN32
    /* GetCommandLineW should contain the accessible path,
     * use argv[0] as is */
#elif defined __linux__
    {
        char selfexe[MAXPATHLEN];
        ssize_t len = readlink("/proc/self/exe", selfexe, sizeof(selfexe));
        if (len < 0) {
            perror("readlink(\"/proc/self/exe\")");
            return NULL;
        }
        selfexe[len] = '\0';
        cmd = selfexe;
    }
#elif defined HAVE_DLADDR
    {
        Dl_info dli;
        if (!dladdr(stub_options, &dli)) {
            perror("dladdr");
            return NULL;
        }
        cmd = (char *)dli.dli_fname;
    }
#endif

#ifndef HAVE_SETPROCTITLE
    /* argc and argv must be the original */
    ruby_init_setproctitle(argc, argv);
#endif

    /* set script with -x option */
    /* xargv[0] is NULL not to re-initialize setproctitle again */
    xargv[2] = cmd;
    ret = ruby_options(3, xargv);

    /* set all arguments to ARGV */
    ruby_set_argv(argc - 1, argv + 1);

    return ret;
}