fastboot

    810 int main(int argc, char **argv)
    811 {
    919     while (argc > 0) {
    920         if(!strcmp(*argv, "getvar")) {
    921             require(2);
    922             fb_queue_display(argv[1], argv[1]);
    923             skip(2);
   1016         } else if(!strcmp(*argv, "oem")) {
   1017             argc = do_oem_command(argc, argv);

   751 int do_oem_command(int argc, char **argv)
    752 {
    753     int i;
    754     char command[256];
    755     if (argc <= 1) return 0;
    756 
    757     command[0] = 0;
    758     while(1) {
    759         strcat(command,*argv);
    760         skip(1);
    761         if(argc == 0) break;
    762         strcat(command," ");
    763     }
    764 
    765     fb_queue_command(command,"");
    766     return 0;
    767 }

    570 void fb_queue_command(const char *cmd, const char *msg)
    571 {
    572     Action *a = queue_action(OP_COMMAND, cmd);
    573     a->msg = msg;
    574 }

    191 static Action *queue_action(unsigned op, const char *fmt, ...)
    192 {
    193     Action *a;
    194     va_list ap;
    195     size_t cmdsize;
    196 
    197     a = calloc(1, sizeof(Action));
    198     if (a == 0) die("out of memory");
    199 
    200     va_start(ap, fmt);
    201     cmdsize = vsnprintf(a->cmd, sizeof(a->cmd), fmt, ap);
    202     va_end(ap);
    203 
    204     if (cmdsize >= sizeof(a->cmd)) {
    205         free(a);
    206         die("Command length (%d) exceeds maximum size (%d)", cmdsize, sizeof(a->cmd));
    207     }
    208 
    209     if (action_last) {
    210         action_last->next = a;
    211     } else {
    212         action_list = a;
    213     }
    214     action_last = a;
    215     a->op = op;
    216     a->func = cb_default;
    217 
    218     a->start = -1;
    219 
    220     return a;
    221 }

oem unlockのコマンドの実態はどこにあるんだろう？

OEM
OEM commands are proprietary commands created by the device's manufacturer. The most famous of which is fastboot oem unlock which unlocks a Nexus device's bootloader to allow the flashing of partitions, and its opposite, fastboot oem lock which re-locks the bootloader. HTC also uses the fastboot oem command for use with their HTCDev bootloader unlocking program.

android-modding-source.pdf