Aggiunti un po' di codici di errore

diff --git a/errors.tex b/errors.tex
index a2aaa7446a8f30b2f22ee44514408903ab81c6b8..3dc51896fc2528d363748d0e660ee2a064415bae 100644 (file)
--- a/errors.tex
+++ b/errors.tex
@@ -45,7 +45,6 @@ libreria che operano sui file.
   scrivere, o viceversa.
 \item \macro{ENOMEM} \textit{No memory available}. Il kernel non è in grado di
   allocare ulteriore memoria per completare l'operazione richiesta.
-  
 \item \macro{EACCESS} \textit{Permission denied}. Permesso negato: l'accesso
   al file non è consentito: i permessi del file o della directory non
   consentono l'operazione.
@@ -63,14 +62,14 @@ libreria che operano sui file.
 \item \macro{EMFILE} \textit{Too many open files}. 
 \item \macro{ENFILE} \textit{File table overflow}. 
 \item \macro{ENOTTY} \textit{Not a terminal}. 
-\item \macro{ETXTBSY} \textit{}. 
+\item \macro{ETXTBSY} \textit{Text file busy}. 
 \item \macro{EFBIG} \textit{File too big}. 
 
 \item \macro{ENOSPC} \textit{No space left on device}. la directory in cui si
   vuole creare il link non ha spazio per ulteriori voci.
 
 \item \macro{ESPIPE} \textit{Invalid seek operation}. 
-\item \macro{EROFS} \textit{}.  il file risiede su un filesystem read-only.
+\item \macro{EROFS} \textit{Read-only file system}.  il file risiede su un filesystem read-only.
   
 \item \macro{EMLINK} \textit{Too many links}. Ci sono troppi link al file (il
   numero massimo è specificato dalla variabile \macro{LINK\_MAX}, vedi
@@ -80,49 +79,48 @@ libreria che operano sui file.
 \item \macro{EDOM} \textit{Domain error}. 
 \item \macro{ERANGE} \textit{Range error}. 
 \item \macro{EAGAIN} \textit{Resource temporarily unavailable}. 
-\item \macro{EWOULDBLOCK} \textit{}. 
-\item \macro{EINPROGRESS} \textit{}. 
-\item \macro{EALREADY} \textit{}. 
-\item \macro{ENOTSOCK} \textit{}. 
-\item \macro{EMSGSIZE} \textit{}. 
-\item \macro{EALREADY} \textit{}. 
-\item \macro{ENOTSOCK} \textit{}. 
-\item \macro{EMSGSIZE} \textit{}. 
-\item \macro{EPROTOTYPE} \textit{}. 
-\item \macro{ENOPROTOOPT} \textit{}. 
-\item \macro{EPROTONOSUPPORT} \textit{}. 
-\item \macro{ESOCKTNOSUPPORT} \textit{}. 
-\item \macro{EOPNOTSUPP} \textit{}. 
-\item \macro{EPFNOSUPPORT} \textit{}. 
-\item \macro{EAFNOSUPPORT} \textit{}. 
-\item \macro{EADDRINUSE} \textit{}. 
-\item \macro{EADDRNOTAVAIL} \textit{}. 
-\item \macro{ENETDOWN} \textit{}. 
-\item \macro{ENETUNREACH} \textit{}. 
-\item \macro{ENETRESET} \textit{}. 
-\item \macro{ECONNABORTED} \textit{}. 
-\item \macro{ECONNRESET} \textit{}. 
-\item \macro{ENOBUFS} \textit{}. 
-\item \macro{EISCONN} \textit{}. 
-\item \macro{ENOTCONN} \textit{}. 
-\item \macro{EDESTADDRREQ} \textit{}. 
-\item \macro{ESHUTDOWN} \textit{}. 
-\item \macro{ETOOMANYREFS} \textit{}. 
-\item \macro{ETIMEDOUT} \textit{}. 
-\item \macro{ECONNREFUSED} \textit{}. 
-
-\item \macro{ELOOP} ci sono troppi link simbolici nella risoluzione di un
-  pathname.
-
-\item \macro{ENAMETOOLONG} si è indicato un pathname troppo lungo.
-
-\item \macro{EHOSTDOWN} \textit{}. 
-\item \macro{EHOSTUNREACH} \textit{}. 
-\item \macro{ENOTEMPTY} \textit{}. 
+\item \macro{EWOULDBLOCK} \textit{Operation would block}. In Linux è identico
+  a \macro{EAGAIN}.
+\item \macro{EINPROGRESS} \textit{Operation now in progress}. 
+\item \macro{EALREADY} \textit{Operation already in progress}. 
+\item \macro{ENOTSOCK} \textit{Socket operation on non-socket}. 
+\item \macro{EMSGSIZE} \textit{Message too long}. 
+\item \macro{EPROTOTYPE} \textit{Protocol wrong type for socket}. 
+\item \macro{ENOPROTOOPT} \textit{Protocol not available}. 
+\item \macro{EPROTONOSUPPORT} \textit{Protocol not supported}. 
+\item \macro{ESOCKTNOSUPPORT} \textit{Socket type not supported}. 
+\item \macro{EOPNOTSUPP} \textit{Operation not supported on transport endpoint}. 
+\item \macro{EPFNOSUPPORT} \textit{Protocol family not supported}. 
+\item \macro{EAFNOSUPPORT} \textit{Address family not supported by protocol}. 
+\item \macro{EADDRINUSE} \textit{Address already in use}. 
+\item \macro{EADDRNOTAVAIL} \textit{Cannot assign requested address}. 
+\item \macro{ENETDOWN} \textit{Network is down}. 
+\item \macro{ENETUNREACH} \textit{Network is unreachable}. 
+\item \macro{ENETRESET} \textit{Network dropped connection because of reset}. 
+\item \macro{ECONNABORTED} \textit{Software caused connection abort}. 
+\item \macro{ECONNRESET} \textit{Connection reset by peer}. 
+\item \macro{ENOBUFS} \textit{No buffer space available}. 
+\item \macro{EISCONN} \textit{Transport endpoint is already connected}. 
+\item \macro{ENOTCONN} \textit{Transport endpoint is not connected}. 
+\item \macro{EDESTADDRREQ} \textit{Destination address required}. 
+\item \macro{ESHUTDOWN} \textit{Cannot send after transport endpoint shutdown}. 
+\item \macro{ETOOMANYREFS} \textit{Too many references: cannot splice}. 
+\item \macro{ETIMEDOUT} \textit{Connection timed out}. 
+\item \macro{ECONNREFUSED} \textit{Connection refused}. 
+  
+\item \macro{ELOOP} \textit{Too many symbolic links encountered}. ci sono
+  troppi link simbolici nella risoluzione di un pathname.
+  
+\item \macro{ENAMETOOLONG} \textit{File name too long}. si è indicato un
+  pathname troppo lungo.
+
+\item \macro{EHOSTDOWN} \textit{Host is down}. 
+\item \macro{EHOSTUNREACH} \textit{No route to host}. 
+\item \macro{ENOTEMPTY} \textit{Directory not empty}. 
 \item \macro{EPROCLIM} \textit{}. 
-\item \macro{EUSERS} \textit{}. 
-\item \macro{EDQUOT} \textit{}. 
-\item \macro{ESTALE} \textit{}. 
+\item \macro{EUSERS} \textit{Too many users}. 
+\item \macro{EDQUOT} \textit{Quota exceeded}. 
+\item \macro{ESTALE} \textit{Stale NFS file handle}. 
 \item \macro{EREMOTE} \textit{}. 
 \item \macro{EBADRPC} \textit{}. 
 \item \macro{ERPCMISMATCH} \textit{}. 
@@ -135,73 +133,68 @@ libreria che operano sui file.
 \item \macro{ENEEDAUTH} \textit{}. 
 \item \macro{ENOSYS} \textit{Function not implemented}. 
 \item \macro{ENOTSUP} \textit{Not supported}. 
-\item \macro{EILSEQ} \textit{}. 
+\item \macro{EILSEQ} \textit{Illegal byte sequence}. 
 \item \macro{EBACKGROUND} \textit{}. 
 \item \macro{EDIED} \textit{}. 
 \item \macro{ED} \textit{}. 
 \item \macro{EGREGIOUS} \textit{}. 
 \item \macro{EIEIO} \textit{}. 
 \item \macro{EGRATUITOUS} \textit{}. 
-\item \macro{EBADMSG} \textit{}. 
-\item \macro{EIDRM} \textit{}. 
-\item \macro{EMULTIHOP} \textit{}. 
-\item \macro{ENODATA} \textit{}. 
-\item \macro{ENOLINK} \textit{}. 
-\item \macro{ENOMSG} \textit{}. 
-\item \macro{ENOSR} \textit{}. 
-\item \macro{ENOSTR} \textit{}. 
-\item \macro{EOVERFLOW} \textit{}. 
-\item \macro{EPROTO} \textit{}. 
-\item \macro{ETIME} \textit{}. 
+\item \macro{EBADMSG} \textit{Not a data message}. 
+\item \macro{EIDRM} \textit{Identifier removed}. 
+\item \macro{EMULTIHOP} \textit{Multihop attempted}. 
+\item \macro{ENODATA} \textit{No data available}. 
+\item \macro{ENOLINK} \textit{Link has been severed}. 
+\item \macro{ENOMSG} \textit{No message of desired type}. 
+\item \macro{ENOSR} \textit{Out of streams resources}. 
+\item \macro{ENOSTR} \textit{Device not a stream}. 
+\item \macro{EOVERFLOW} \textit{Value too large for defined data type}. 
+\item \macro{EPROTO} \textit{Protocol error}. 
+\item \macro{ETIME} \textit{Timer expired}. 
 
 
 \section{Errori del kernel}
 \label{sec:err_kernel_err}
 
 
-\item \macro{ERESTART} \textit{}. 
-\item \macro{ECHRNG} \textit{}. 
-\item \macro{EL2NSYNC} \textit{}. 
-\item \macro{EL3HLT} \textit{}. 
-\item \macro{EL3RST} \textit{}. 
-\item \macro{ELNRNG} \textit{}. 
-\item \macro{EUNATCH} \textit{}. 
-\item \macro{ENOCSI} \textit{}. 
-\item \macro{EL2HLT} \textit{}. 
-\item \macro{EBADE} \textit{}. 
-\item \macro{EBADR} \textit{}. 
-\item \macro{EXFULL} \textit{}. 
-\item \macro{ENOANO} \textit{}. 
-\item \macro{EBADRQC} \textit{}. 
-\item \macro{EBADSLT} \textit{}. 
-\item \macro{EDEADLOCK} \textit{}. 
-\item \macro{EBFONT} \textit{}. 
-\item \macro{ENONET} \textit{}. 
-\item \macro{ENOPKG} \textit{}. 
-\item \macro{EADV} \textit{}. 
-\item \macro{ESRMNT} \textit{}. 
-\item \macro{ECOMM} \textit{}. 
-\item \macro{EDOTDOT} \textit{}. 
-\item \macro{ENOTUNIQ} \textit{}. 
-\item \macro{EBADFD} \textit{}. 
-\item \macro{EREMCHG} \textit{}. 
-\item \macro{ELIBACC} \textit{}. 
-\item \macro{ELIBBAD} \textit{}. 
-\item \macro{ELIBSCN} \textit{}. 
-\item \macro{ELIBMAX} \textit{}. 
-\item \macro{ELIBEXEC} \textit{}. 
-\item \macro{ESTRPIPE} \textit{}. 
-\item \macro{EUCLEAN} \textit{}. 
-\item \macro{ENAVAIL} \textit{}. 
-\item \macro{EISNAM} \textit{}. 
-\item \macro{EREMOTEIO} \textit{}. 
-\item \macro{ENOMEDIUM} \textit{}. 
-\item \macro{EMEDIUMTYPE} \textit{}. 
-\item \macro{} \textit{}. 
-\item \macro{} \textit{}. 
-\item \macro{} \textit{}. 
-\item \macro{} \textit{}. 
-\item \macro{} \textit{}. 
+\item \macro{ERESTART/} \textit{Interrupted system call should be restarted}. 
+\item \macro{ECHRNG} \textit{Channel number out of range}. 
+\item \macro{EL2NSYNC} \textit{Level 2 not synchronized}. 
+\item \macro{EL3HLT} \textit{Level 3 halted}. 
+\item \macro{EL3RST} \textit{Level 3 reset}. 
+\item \macro{ELNRNG} \textit{Link number out of range}. 
+\item \macro{EUNATCH} \textit{Protocol driver not attached}. 
+\item \macro{ENOCSI} \textit{No CSI structure available}. 
+\item \macro{EL2HLT} \textit{Level 2 halted}. 
+\item \macro{EBADE} \textit{Invalid exchange}. 
+\item \macro{EBADR} \textit{Invalid request descriptor}. 
+\item \macro{EXFULL} \textit{Exchange full}. 
+\item \macro{ENOANO} \textit{No anode}. 
+\item \macro{EBADRQC} \textit{Invalid request code}. 
+\item \macro{EBADSLT} \textit{Invalid slot}. 
+\item \macro{EDEADLOCK} Identico a \macro{EDEADLK}. 
+\item \macro{EBFONT} \textit{Bad font file format}. 
+\item \macro{ENONET} \textit{Machine is not on the network}. 
+\item \macro{ENOPKG} \textit{Package not installed}. 
+\item \macro{EADV} \textit{Advertise error}. 
+\item \macro{ESRMNT} \textit{Srmount error}. 
+\item \macro{ECOMM} \textit{Communication error on send}. 
+\item \macro{EDOTDOT} \textit{RFS specific error}. 
+\item \macro{ENOTUNIQ} \textit{Name not unique on network}. 
+\item \macro{EBADFD} \textit{File descriptor in bad state}. 
+\item \macro{EREMCHG} \textit{Remote address changed}. 
+\item \macro{ELIBACC} \textit{Can not access a needed shared library}. 
+\item \macro{ELIBBAD} \textit{Accessing a corrupted shared library}. 
+\item \macro{ELIBSCN} \textit{.lib section in a.out corrupted}. 
+\item \macro{ELIBMAX} \textit{Attempting to link in too many shared libraries}. 
+\item \macro{ELIBEXEC} \textit{Cannot exec a shared library directly}. 
+\item \macro{ESTRPIPE} \textit{Streams pipe error}. 
+\item \macro{EUCLEAN} \textit{Structure needs cleaning}. 
+\item \macro{ENAVAIL} \textit{No XENIX semaphores available}. 
+\item \macro{EISNAM} \textit{Is a named type file}. 
+\item \macro{EREMOTEIO} \textit{Remote I/O error}. 
+\item \macro{ENOMEDIUM} \textit{No medium found}. 
+\item \macro{EMEDIUMTYPE} \textit{Wrong medium type}. 
 \item \macro{} \textit{}. 
 
 

diff --git a/filedir.tex b/filedir.tex
index f6ad01f2cae55b035e4e20934db05fe9326b4182..cbd718bdc7582cb4c0d1f567a5405e8aba1ac1bc 100644 (file)
--- a/filedir.tex
+++ b/filedir.tex
@@ -22,10 +22,10 @@ le funzioni usate per gestirne i vari aspetti.
 \subsection{I permessi per l'accesso ai file}
 \label{sec:file_perm_overview}
 
-Il controllo di accesso ai file in unix segue un modello abbastanza semplice,
-ma adatto alla gran parte delle esigenze, in cui si dividono i permessi su tre
-livelli. Si tenga conto poi che quanto diremo è vero solo per filesystem di
-tipo unix, e non è detto che sia applicabile a un filesystem
+Il controllo di accesso ai file in unix segue un modello abbastanza semplice
+(ma adatto alla gran parte delle esigenze) in cui si dividono i permessi su
+tre livelli. Si tenga conto poi che quanto diremo è vero solo per filesystem
+di tipo unix, e non è detto che sia applicabile a un filesystem
 qualunque\footnote{ed infatti non è vero per il filesystem vfat di Windows,
   per il quale i permessi vengono assegnati in maniera fissa con un opzione in
   fase di montaggio}.  Esistono inoltre estensioni che permettono di

diff --git a/prochand.tex b/prochand.tex
index b337e4de05fa73b64c708a9cf62a2c6da36ad7b4..e7db230ad1d2ae912ad7840743ffe96f9b5ef24e 100644 (file)
--- a/prochand.tex
+++ b/prochand.tex
@@ -131,10 +131,10 @@ processo il processo di avvio (init) ha sempre il pid uguale a uno.
 Ogni processo è identificato univocamente dal sistema per il suo pid;
 quest'ultimo è un tipo di dato standard, il \texttt{pid\_t} che in genere è un
 intero con segno (nel caso di Linux e delle glibc il tipo usato è
-\texttt{int}).
+\type{int}).
 
 Tutti i processi inoltre portano traccia del pid del genitore, chiamato in
-genere \textit{ppid} (da \textit{Parente Process Id}). Questi identificativi
+genere \textit{ppid} (da \textit{parent process id}). Questi identificativi
 possono essere ottenuti da un programma usando le funzioni:
 \begin{functions}
 \headdecl{sys/types.h}
@@ -142,9 +142,36 @@ possono essere ottenuti da un programma usando le funzioni:
 \funcdecl{pid\_t getpid(void)} restituisce il pid del processo corrente.
 \funcdecl{pid\_t getppid(void)} restituisce il pid del padre del processo
     corrente.
-\end{functions}
 
+Entrambe le funzioni non riportano condizioni di errore. 
+\end{functions}
 
+Come accennato in \secref{sec:file_perm_overview} ciascun processo porta con
+se un gruppo di identificatori (riportati in \ntab) che indicano l'utente che
+lo ha posto in esecuzione, e sono usati per il controllo di accesso.
+
+
+\begin{table}[htb]
+  \centering
+  \begin{tabular}[c]{|c|l|l|}
+    \hline
+    Sigla & Significato & Utilizzo \\ 
+    \hline
+    \hline
+    \acr{ruid} & \textit{real user id} & indica l'utente reale \\ 
+    \acr{rgid} & \textit{real group id} & indica il gruppo reale \\ 
+    \acr{euid} & \textit{effective user id} & indica l'utente reale \\ 
+    \acr{egid} & \textit{effective group id} & indica il gruppo reale \\ 
+               & \textit{supplementaru group id} & indica il gruppo  \\ 
+    \acr{suid} & \textit{saved user id} & indica l'utente reale \\ 
+    \acr{sgid} & \textit{daved group id} & indica il gruppo reale \\ 
+    \acr{fsuid} & \textit{real user id} & indica l'utente reale \\ 
+    \acr{fsgid} & \textit{real group id} & indica il gruppo reale \\ 
+    \hline
+  \end{tabular}
+  \caption{Identificatori di utente e gruppo associati a ciascun processo.}
+  \label{tab:proc_uid_gid}
+\end{table}
 
 \subsection{La funzione \func{fork}}
 \label{sec:proc_fork}