Function process_dup

dpdk/app/test/process.h:72–200

* launches a second copy of the test process using the given argv parameters, * which should include argv[0] as the process name. To identify in the * subprocess the source of the call, the env_value parameter is set in the * environment as $RTE_TEST */

 * environment as $RTE_TEST
 */
static inline int
process_dup(const char *const argv[], int numargs, const char *env_value)
{
	int num = 0;
	char **argv_cpy;
	int allow_num;
	int argv_num;
	int i, status;
	char path[32];
#ifdef RTE_LIB_PDUMP
#ifdef RTE_NET_RING
	rte_thread_t thread;
	int rc;
#endif
#endif

	pid_t pid = fork();
	if (pid < 0)
		return -1;
	else if (pid == 0) {
		allow_num = rte_devargs_type_count(RTE_DEVTYPE_ALLOWED);
		argv_num = numargs + allow_num + 1;
		argv_cpy = calloc(argv_num, sizeof(char *));
		if (!argv_cpy)
			rte_panic("Memory allocation failed\n");

		/* make a copy of the arguments to be passed to exec */
		for (i = 0; i < numargs; i++) {
			argv_cpy[i] = strdup(argv[i]);
			if (argv_cpy[i] == NULL)
				rte_panic("Error dup args\n");
		}
		if (allow_num > 0)
			num = add_parameter_allow(&argv_cpy[i], allow_num);
		num += numargs;

#ifdef RTE_EXEC_ENV_LINUX
		{
			const char *procdir = "/proc/" self "/fd/";
			struct dirent *dirent;
			char *endptr;
			int fd, fdir;
			DIR *dir;

			/* close all open file descriptors, check /proc/self/fd
			 * to only call close on open fds. Exclude fds 0, 1 and
			 * 2
			 */
			dir = opendir(procdir);
			if (dir == NULL) {
				rte_panic("Error opening %s: %s\n", procdir,
						strerror(errno));
			}

			fdir = dirfd(dir);
			if (fdir < 0) {
				status = errno;
				closedir(dir);