?? shmemusr.c
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#include <stdio.h>#include <signal.h> /* signal(), SIGINT */#include <unistd.h> /* sleep() */#include "rtapi.h" /* user-level API to RT Linux */#include "common.h" /* shmem structure */static int module;static int key = SHMEM_KEY;static int shmem_id;static SHMEM_STRUCT *shmem_struct;static int done = 0;static void quit(int sig){ done = 1;}int main(){ int retval; module = rtapi_init("SHMEM_USR"); if (module < 1) { rtapi_print_msg(RTAPI_MSG_ERR, "shmemusr main: rtapi_init returned %d\n", module); return -1; } /* allocate the shared memory structure */ shmem_id = rtapi_shmem_new(key, module, sizeof(SHMEM_STRUCT)); if (shmem_id < 0) { rtapi_print_msg(RTAPI_MSG_ERR, "shmemusr main: rtapi_shmem_new returned %d\n", shmem_id); rtapi_exit(module); return -1; } retval = rtapi_shmem_getptr(shmem_id, (void **) &shmem_struct); if (retval != RTAPI_SUCCESS) { rtapi_print_msg(RTAPI_MSG_ERR, "shmemusr main: rtapi_shmem_getptr returned %d\n", retval); rtapi_exit(module); return -1; } signal(SIGINT, quit); while (!done) { rtapi_print("%lu\n", shmem_struct->heartbeat); sleep(1); } retval = rtapi_shmem_delete(shmem_id, module); if (retval != RTAPI_SUCCESS) { rtapi_print_msg(RTAPI_MSG_ERR, "shmemusr main: rtapi_free_shmem returned %d\n", retval); rtapi_exit(module); return -1; } return rtapi_exit(module);}?? 快捷鍵說明
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