Merge "Make host ashmem_create_region seed only once."

#include <errno.h>

#include <fcntl.h>

#include <limits.h>

#include <pthread.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define __unused __attribute__((__unused__))

#endif

static pthread_once_t seed_initialized = PTHREAD_ONCE_INIT;

static void initialize_random() {

    srand(time(NULL) + getpid());

}

int ashmem_create_region(const char *ignored __unused, size_t size)

{

    static const char txt[] = "abcdefghijklmnopqrstuvwxyz"

    unsigned int retries = 0;

    pid_t pid = getpid();

    int fd;

	srand(time(NULL) + pid);

retry:

    if (pthread_once(&seed_initialized, &initialize_random) != 0) {

        return -1;

    }

    do {

        /* not beautiful, its just wolf-like loop unrolling */

        snprintf(name, sizeof(name), "/tmp/android-ashmem-%d-%c%c%c%c%c%c%c%c",

        pid,

        fd = open(name, O_RDWR | O_CREAT | O_EXCL, 0600);

        if (fd == -1) {

            /* unlikely, but if we failed because `name' exists, retry */

		if (errno == EEXIST && ++retries < 6)

			goto retry;

            if (errno != EEXIST || ++retries >= 6) {

                return -1;

            }

        }

    } while (fd == -1);

    /* truncate the file to `len' bytes */

	if (ftruncate(fd, size) == -1)

		goto error;

	if (unlink(name) == -1)

		goto error;

    if (ftruncate(fd, size) != -1 && unlink(name) != -1) {

        return fd;

error:

    }

    close(fd);

    return -1;

}