\begin{figure}[!htb]
\footnotesize \centering
\begin{minipage}[c]{15cm}
- \begin{lstlisting}[stepnumber=0]{}
-struct pollfd {
- int fd; /* file descriptor */
- short events; /* requested events */
- short revents; /* returned events */
-};
- \end{lstlisting}
+ \includestruct{listati/pollfd.h}
\end{minipage}
\normalsize
- \caption{La struttura \struct{pollfd}, utilizzata per specificare le modalità
- di controllo di un file descriptor alla funzione \func{poll}.}
+ \caption{La struttura \structd{pollfd}, utilizzata per specificare le
+ modalità di controllo di un file descriptor alla funzione \func{poll}.}
\label{fig:file_pollfd}
\end{figure}
\begin{figure}[!htb]
\footnotesize \centering
\begin{minipage}[c]{15cm}
- \begin{lstlisting}[stepnumber=0]{}
-struct aiocb
-{
- int aio_fildes; /* File descriptor. */
- off_t aio_offset; /* File offset */
- int aio_lio_opcode; /* Operation to be performed. */
- int aio_reqprio; /* Request priority offset. */
- volatile void *aio_buf; /* Location of buffer. */
- size_t aio_nbytes; /* Length of transfer. */
- struct sigevent aio_sigevent; /* Signal number and value. */
-};
- \end{lstlisting}
+ \includestruct{listati/aiocb.h}
\end{minipage}
\normalsize
- \caption{La struttura \struct{aiocb}, usata per il controllo dell'I/O
+ \caption{La struttura \structd{aiocb}, usata per il controllo dell'I/O
asincrono.}
\label{fig:file_aiocb}
\end{figure}
\begin{figure}[!htb]
\footnotesize \centering
\begin{minipage}[c]{15cm}
- \begin{lstlisting}[stepnumber=0]{}
-struct sigevent
-{
- sigval_t sigev_value;
- int sigev_signo;
- int sigev_notify;
- void (*sigev_notify_function)(sigval_t);
- pthread_attr_t *sigev_notify_attributes;
-};
- \end{lstlisting}
+ \includestruct{listati/sigevent.h}
\end{minipage}
\normalsize
- \caption{La struttura \struct{sigevent}, usata per specificare le modalità di
- notifica degli eventi relativi alle operazioni di I/O asincrono.}
+ \caption{La struttura \structd{sigevent}, usata per specificare le modalità
+ di notifica degli eventi relativi alle operazioni di I/O asincrono.}
\label{fig:file_sigevent}
\end{figure}
\begin{figure}[!htb]
\footnotesize \centering
\begin{minipage}[c]{15cm}
- \begin{lstlisting}[stepnumber=0]{}
-struct iovec {
- __ptr_t iov_base; /* Starting address */
- size_t iov_len; /* Length in bytes */
-};
- \end{lstlisting}
+ \includestruct{listati/iovec.h}
\end{minipage}
\normalsize
- \caption{La struttura \struct{iovec}, usata dalle operazioni di I/O
+ \caption{La struttura \structd{iovec}, usata dalle operazioni di I/O
vettorizzato.}
\label{fig:file_iovec}
\end{figure}
\begin{figure}[!bht]
\footnotesize \centering
\begin{minipage}[c]{15cm}
- \begin{lstlisting}[stepnumber=0]{}
-struct flock {
- short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
- short int l_whence; /* Where `l_start' is relative to (like `lseek').*/
- off_t l_start; /* Offset where the lock begins. */
- off_t l_len; /* Size of the locked area; zero means until EOF.*/
- pid_t l_pid; /* Process holding the lock. */
-};
- \end{lstlisting}
+ \includestruct{listati/flock.h}
\end{minipage}
\normalsize
- \caption{La struttura \struct{flock}, usata da \func{fcntl} per il file
+ \caption{La struttura \structd{flock}, usata da \func{fcntl} per il file
locking.}
\label{fig:struct_flock}
\end{figure}
\begin{figure}[!htb]
\footnotesize \centering
\begin{minipage}[c]{15cm}
- \begin{lstlisting}{}
-int main(int argc, char *argv[])
-{
- int type = F_UNLCK; /* lock type: default to unlock (invalid) */
- off_t start = 0; /* start of the locked region: default to 0 */
- off_t len = 0; /* length of the locked region: default to 0 */
- int fd, res, i; /* internal variables */
- int bsd = 0; /* semantic type: default to POSIX */
- int cmd = F_SETLK; /* lock command: default to non-blocking */
- struct flock lock; /* file lock structure */
- ...
- if ((argc - optind) != 1) { /* There must be remaing parameters */
- printf("Wrong number of arguments %d\n", argc - optind);
- usage();
- }
- if (type == F_UNLCK) { /* There must be a -w or -r option set */
- printf("You should set a read or a write lock\n");
- usage();
- }
- fd = open(argv[optind], O_RDWR); /* open the file to be locked */
- if (fd < 0) { /* on error exit */
- perror("Wrong filename");
- exit(1);
- }
- /* do lock */
- if (bsd) { /* if BSD locking */
- /* rewrite cmd for suitables flock operation values */
- if (cmd == F_SETLKW) { /* if no-blocking */
- cmd = LOCK_NB; /* set the value for flock operation */
- } else { /* else */
- cmd = 0; /* default is null */
- }
- if (type == F_RDLCK) cmd |= LOCK_SH; /* set for shared lock */
- if (type == F_WRLCK) cmd |= LOCK_EX; /* set for exclusive lock */
- res = flock(fd, cmd); /* esecute lock */
- } else { /* if POSIX locking */
- /* setting flock structure */
- lock.l_type = type; /* set type: read or write */
- lock.l_whence = SEEK_SET; /* start from the beginning of the file */
- lock.l_start = start; /* set the start of the locked region */
- lock.l_len = len; /* set the length of the locked region */
- res = fcntl(fd, cmd, &lock); /* do lock */
- }
- /* check lock results */
- if (res) { /* on error exit */
- perror("Failed lock");
- exit(1);
- } else { /* else write message */
- printf("Lock acquired\n");
- }
- pause(); /* stop the process, use a signal to exit */
- return 0;
-}
- \end{lstlisting}
+ \includecodesample{listati/Flock.c}
\end{minipage}
\normalsize
\caption{Sezione principale del codice del programma \file{Flock.c}.}
projects / gapil.git / blobdiff