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sysdep.h File Reference

#include "copyright.h"
#include <stdio.h>
#include <string.h>

Go to the source code of this file.

Functions

bool PollFile (int fd)
int OpenForWrite (char *name)
int OpenForReadWrite (char *name, bool crashOnError)
void Read (int fd, char *buffer, int nBytes)
int ReadPartial (int fd, char *buffer, int nBytes)
void WriteFile (int fd, char *buffer, int nBytes)
void Lseek (int fd, int offset, int whence)
int Tell (int fd)
void Close (int fd)
bool Unlink (char *name)
int OpenSocket ()
void CloseSocket (int sockID)
void AssignNameToSocket (char *socketName, int sockID)
void DeAssignNameToSocket (char *socketName)
bool PollSocket (int sockID)
void ReadFromSocket (int sockID, char *buffer, int packetSize)
void SendToSocket (int sockID, char *buffer, int packetSize, char *toName)
void Abort ()
void Exit (int exitCode)
void Delay (int seconds)
void CallOnUserAbort (VoidNoArgFunctionPtr cleanUp)
void RandomInit (unsigned seed)
int Random ()
char * AllocBoundedArray (int size)
void DeallocBoundedArray (char *p, int size)
int atoi (const char *str)
double atof (const char *str)
int abs (int i)

Function Documentation

void Abort (    ) 
 

Definition at line 430 of file sysdep.cc. 

00431 {
00432     abort();
00433 }

int abs (  int    i ) 
 

Referenced by Disk::TimeToSeek.

char* AllocBoundedArray (  int    size ) 
 

Definition at line 482 of file sysdep.cc.

Referenced by Thread::StackAllocate. 

00483 {
00484     int pgSize = getpagesize();
00485     char *ptr = new char[pgSize * 2 + size];
00486 
00487     mprotect(ptr, pgSize, 0);
00488     mprotect(ptr + pgSize + size, pgSize, 0);
00489     return ptr + pgSize;
00490 }

void AssignNameToSocket (  char *    socketName,
int    sockID
) 
 

Definition at line 319 of file sysdep.cc.

Referenced by Network::Network. 

00320 {
00321     struct sockaddr_un uName;
00322     int retVal;
00323 
00324     (void) unlink(socketName);    // in case it's still around from last time
00325 
00326     InitSocketName(&uName, socketName);
00327     retVal = bind(sockID, (struct sockaddr *) &uName, sizeof(uName));
00328     ASSERT(retVal >= 0);
00329     DEBUG('n', "Created socket %s\n", socketName);
00330 }

double atof (  const char *    str ) 
 

Referenced by Initialize.

int atoi (  const char *    str ) 
 

Referenced by Initialize, and main.

void CallOnUserAbort (  VoidNoArgFunctionPtr    cleanUp ) 
 

Definition at line 406 of file sysdep.cc.

Referenced by Initialize. 

00407 {
00408     (void)signal(SIGINT, (VoidFunctionPtr) func);
00409 }

void Close (  int    fd ) 
 

void CloseSocket (  int    sockID ) 
 

Definition at line 295 of file sysdep.cc.

Referenced by Network::~Network. 

00296 {
00297     (void) close(sockID);
00298 }

void DeallocBoundedArray (  char *    p,
int    size
) 
 

Definition at line 501 of file sysdep.cc.

Referenced by Thread::~Thread. 

00502 {
00503     int pgSize = getpagesize();
00504 
00505     mprotect(ptr - pgSize, pgSize, PROT_READ | PROT_WRITE | PROT_EXEC);
00506     mprotect(ptr + size, pgSize, PROT_READ | PROT_WRITE | PROT_EXEC);
00507     delete [] (ptr - pgSize);
00508 }

void DeAssignNameToSocket (  char *    socketName ) 
 

Definition at line 337 of file sysdep.cc.

Referenced by Network::~Network. 

00338 {
00339     (void) unlink(socketName);
00340 }

void Delay (  int    seconds ) 
 

Definition at line 419 of file sysdep.cc.

Referenced by main. 

00420 {
00421     (void) sleep((unsigned) seconds);
00422 }

void Exit (  int    exitCode ) 
 

void Lseek (  int    fd,
int    offset,
int    whence
) 
 

Definition at line 226 of file sysdep.cc.

Referenced by Disk::Disk, Disk::ReadRequest, and Disk::WriteRequest. 

00227 {
00228     int retVal = lseek(fd, offset, whence);
00229     ASSERT(retVal >= 0);
00230 }

int OpenForReadWrite (  char *    name,
bool    crashOnError
) 
 

Definition at line 175 of file sysdep.cc.

Referenced by Console::Console, and Disk::Disk. 

00176 {
00177     int fd = open(name, O_RDWR, 0);
00178 
00179     ASSERT(!crashOnError || fd >= 0);
00180     return fd;
00181 }

int OpenForWrite (  char *    name ) 
 

Definition at line 158 of file sysdep.cc.

Referenced by Console::Console, and Disk::Disk. 

00159 {
00160     int fd = open(name, O_RDWR|O_CREAT|O_TRUNC, 0666);
00161 
00162     ASSERT(fd >= 0); 
00163     return fd;
00164 }

int OpenSocket (    ) 
 

Definition at line 279 of file sysdep.cc. 

00280 {
00281     int sockID;
00282     
00283     sockID = socket(AF_UNIX, SOCK_DGRAM, 0);
00284     ASSERT(sockID >= 0);
00285 
00286     return sockID;
00287 }

bool PollFile (  int    fd ) 
 

Definition at line 124 of file sysdep.cc.

Referenced by Console::CheckCharAvail, and PollSocket. 

00125 {
00126     int rfd = (1 << fd), wfd = 0, xfd = 0, retVal;
00127     struct timeval pollTime;
00128 
00129 // decide how long to wait if there are no characters on the file
00130     pollTime.tv_sec = 0;
00131     if (interrupt->getStatus() == IdleMode)
00132         pollTime.tv_usec = 20000;               // delay to let other nachos run
00133     else
00134         pollTime.tv_usec = 0;                   // no delay
00135 
00136 // poll file or socket
00137 #if   defined(HOST_i386) || defined(HOST_SVR4)
00138     retVal = select(32, (fd_set*)&rfd, (fd_set*)&wfd, (fd_set*)&xfd, &pollTime);
00139 #else
00140     retVal = select(32, &rfd, &wfd, &xfd, &pollTime);
00141 #endif
00142 
00143     ASSERT((retVal == 0) || (retVal == 1));
00144     if (retVal == 0)
00145         return FALSE;                           // no char waiting to be read
00146     return TRUE;
00147 }

bool PollSocket (  int    sockID ) 
 

Definition at line 348 of file sysdep.cc.

Referenced by Network::CheckPktAvail. 

00349 {
00350     return PollFile(sockID);    // on UNIX, socket ID's are just file ID's
00351 }

int Random (    ) 
 

Definition at line 464 of file sysdep.cc. 

00465 {
00466     return rand();
00467 }

void RandomInit (  unsigned    seed ) 
 

Definition at line 453 of file sysdep.cc.

Referenced by Initialize. 

00454 {
00455     srand(seed);
00456 }

void Read (  int    fd,
char *    buffer,
int    nBytes
) 
 

void ReadFromSocket (  int    sockID,
char *    buffer,
int    packetSize
) 
 

Definition at line 358 of file sysdep.cc.

Referenced by Network::CheckPktAvail. 

00359 {
00360     int retVal;
00361     extern int errno;
00362     struct sockaddr_un uName;
00363     int size = sizeof(uName);
00364    
00365     retVal = recvfrom(sockID, buffer, packetSize, 0,
00366                                    (struct sockaddr *) &uName, &size);
00367 
00368     if (retVal != packetSize) {
00369         perror("in recvfrom");
00370         printf("called: %x, got back %d, %d\n", (unsigned int) buffer, 
00371                retVal, errno);
00372     }
00373     ASSERT(retVal == packetSize);
00374 }

int ReadPartial (  int    fd,
char *    buffer,
int    nBytes
) 
 

Definition at line 202 of file sysdep.cc. 

00203 {
00204     return read(fd, buffer, nBytes);
00205 }

void SendToSocket (  int    sockID,
char *    buffer,
int    packetSize,
char *    toName
) 
 

Definition at line 382 of file sysdep.cc.

Referenced by Network::Send. 

00383 {
00384     struct sockaddr_un uName;
00385     int retVal;
00386 
00387     InitSocketName(&uName, toName);
00388     retVal = sendto(sockID, buffer, packetSize, 0,
00389 #ifdef        HOST_SVR4
00390                     (sockaddr *) &uName, 
00391 #else
00392                     (char *) &uName, 
00393 #endif        /* HOST_SVR4 */
00394                     sizeof(uName));
00395     ASSERT(retVal == packetSize);
00396 }

int Tell (  int    fd ) 
 

Definition at line 238 of file sysdep.cc. 

00239 {
00240 #ifdef HOST_i386
00241     return lseek(fd,0,SEEK_CUR); // 386BSD doesn't have the tell() system call
00242 #else
00243     return tell(fd);
00244 #endif
00245 }

bool Unlink (  char *    name ) 
 

Definition at line 266 of file sysdep.cc. 

00267 {
00268     return unlink(name);
00269 }

void WriteFile (  int    fd,
char *    buffer,
int    nBytes
) 
 

Definition at line 214 of file sysdep.cc.

Referenced by Disk::Disk, Console::PutChar, and Disk::WriteRequest. 

00215 {
00216     int retVal = write(fd, buffer, nBytes);
00217     ASSERT(retVal == nBytes);
00218 }

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