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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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  {
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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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        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 */