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#include <sys/types.h> /* ssize_t */
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#include <sys/stat.h> /* mkfifo(), S_IRUSR, S_IWUSR */
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#include <iso646.h> /* and */
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#include <errno.h> /* errno, EEXIST */
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#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
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ENAMETOOLONG, ENOSPC, EROFS,
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ENOENT, EEXIST, EFAULT, EMFILE,
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ENFILE, ENOMEM, EBADF, EINVAL, EIO,
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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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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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#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
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EX_UNAVAILABLE, EX_IOERR */
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int main(__attribute__((unused))int argc,
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const char passfifo[] = "/lib/cryptsetup/passfifo";
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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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return EX_UNAVAILABLE; /* no "/lib/cryptsetup"? */
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break; /* not an error */
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int fifo_fd = open(passfifo, O_RDONLY);
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return EX_UNAVAILABLE;
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/* Read from FIFO */