Function anetCloexec

app/redis-6.2.6/src/anet.c:110–128

Enable the FD_CLOEXEC on the given fd to avoid fd leaks. * This function should be invoked for fd's on specific places * where fork + execve system calls are called. */

 * This function should be invoked for fd's on specific places 
 * where fork + execve system calls are called. */
int anetCloexec(int fd) {
    int r;
    int flags;

    do {
        r = fcntl(fd, F_GETFD);
    } while (r == -1 && errno == EINTR);

    if (r == -1 || (r & FD_CLOEXEC))
        return r;

    flags = r | FD_CLOEXEC;

    do {
        r = fcntl(fd, F_SETFD, flags);
    } while (r == -1 && errno == EINTR);

    return r;
}

/* Set TCP keep alive option to detect dead peers. The interval option
 * is only used for Linux as we are using Linux-specific APIs to set