const char *file, unsigned line, ...);
int failtest_pipe(int pipefd[2], const char *file, unsigned line);
ssize_t failtest_read(int fd, void *buf, size_t count,
const char *file, unsigned line, ...);
int failtest_pipe(int pipefd[2], const char *file, unsigned line);
ssize_t failtest_read(int fd, void *buf, size_t count,