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plugins.d/askpass-fifo.c
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 * along with this program.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 * 
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 * Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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 * <https://www.fukt.bsnet.se/~teddy/>.
 
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 * Contact the authors at <mandos@fukt.bsnet.se>.
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 */
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#define _GNU_SOURCE             /* TEMP_FAILURE_RETRY() */
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#include <iso646.h>             /* and */
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#include <errno.h>              /* errno, EEXIST */
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#include <stdio.h>              /* perror() */
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#include <stdlib.h>             /* EXIT_FAILURE, NULL, size_t, free(), 
 
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#include <stdlib.h>             /* EXIT_FAILURE, NULL, size_t, free(),
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                                   realloc(), EXIT_SUCCESS */
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#include <fcntl.h>              /* open(), O_RDONLY */
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#include <unistd.h>             /* read(), close(), write(),
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  /* Create FIFO */
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  const char passfifo[] = "/lib/cryptsetup/passfifo";
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  ret = (int)TEMP_FAILURE_RETRY(mkfifo(passfifo, S_IRUSR | S_IWUSR));
 
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  ret = mkfifo(passfifo, S_IRUSR | S_IWUSR);
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  if(ret == -1 and errno != EEXIST){
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    perror("mkfifo");
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    return EXIT_FAILURE;
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  }
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  /* Open FIFO */
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  int fifo_fd = (int)TEMP_FAILURE_RETRY(open(passfifo, O_RDONLY));
 
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  int fifo_fd = open(passfifo, O_RDONLY);
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  if(fifo_fd == -1){
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    perror("open");
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    return EXIT_FAILURE;
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  {
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    size_t buf_allocated = 0;
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    const size_t blocksize = 1024;
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    do{
 
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    do {
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      if(buf_len + blocksize > buf_allocated){
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        char *tmp = realloc(buf, buf_allocated + blocksize);
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        if(tmp == NULL){
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        buf = tmp;
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        buf_allocated += blocksize;
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      }
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      sret = TEMP_FAILURE_RETRY(read(fifo_fd, buf + buf_len,
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                                     buf_allocated - buf_len));
 
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      sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
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      if(sret == -1){
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        perror("read");
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        free(buf);
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        return EXIT_FAILURE;
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      }
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      buf_len += (size_t)sret;
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    }while(sret != 0);
 
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    } while(sret != 0);
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  }
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  /* Close FIFO */
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  TEMP_FAILURE_RETRY(close(fifo_fd));
 
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  close(fifo_fd);
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  /* Print password to stdout */
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  size_t written = 0;
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  while(written < buf_len){
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    sret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buf + written,
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                                    buf_len - written));
 
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    sret = write(STDOUT_FILENO, buf + written, buf_len - written);
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    if(sret == -1){
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      perror("write");
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      free(buf);