Is there any limit to the number of expressions|parameters in a 'while loop' [duplicate]

This question already has an answer here:

• comma separated expression in while loop in C 4 answers

Traditional programming with while-loop is done with a single parameter ex:

• while(1) (or) while(a==b) (or) while(a&&b) (or) while(!a) etc

• The code below takes two parameters in the while loop

  ssize_t r_read(int fd, void *buf, size_t size) 
  {
      ssize_t retval;
      while (retval = read(fd, buf, size), retval == -1 && errno == EINTR);
      return retval;
  }
  
  

  1. Is there any limit to the parameters inside the while loop?
  2. Is there any possible explanation for this or does this methodology have a name?

via Chebli Mohamed