am c113311e: am 74a7b91c: liblogwrap: lock android_fork_execvp

#include <fcntl.h>

#include <libgen.h>

#include <stdbool.h>

#include <pthread.h>

#include <logwrap/logwrap.h>

#include "private/android_filesystem_config.h"

#define ARRAY_SIZE(x)   (sizeof(x) / sizeof(*(x)))

static int signal_fd_write;

static pthread_mutex_t fd_mutex = PTHREAD_MUTEX_INITIALIZER;

#define ERROR(fmt, args...)                                                   \

do {                                                                          \

    int sockets[2];

    int rc = 0;

    rc = pthread_mutex_lock(&fd_mutex);

    if (rc) {

        ERROR("failed to lock signal_fd mutex\n");

        goto err_lock;

    }

    /* Use ptty instead of socketpair so that STDOUT is not buffered */

    parent_ptty = open("/dev/ptmx", O_RDWR);

    if (parent_ptty < 0) {

        rc = -1;

        goto err_fork;

    } else if (pid == 0) {

        pthread_mutex_unlock(&fd_mutex);

        pthread_sigmask(SIG_SETMASK, &oldset, NULL);

        close(parent_ptty);

err_ptty:

    close(parent_ptty);

err_open:

    pthread_mutex_unlock(&fd_mutex);

err_lock:

    return rc;

}