JobGeneratorFake::JobGeneratorFake(QObject *parent) :
QObject(parent)
{
qsrand(QDateTime::currentMSecsSinceEpoch());
generatorTimer_ = new QTimer();
generatorTimer_->setSingleShot(true);
connect(generatorTimer_, SIGNAL(timeout()), this, SLOT(generateJob()));
}
/**
* The Xinu shell. Provides an interface to execute commands.
* @param descrp descriptor of device on which the shell is open
* @return OK for successful exit, SYSERR for unrecoverable error
*/
thread shell(int indescrp, int outdescrp, int errdescrp)
{
char buf[SHELL_BUFLEN]; /* line input buffer */
short buflen; /* length of line input */
char tokbuf[SHELL_BUFLEN + SHELL_MAXTOK]; /* token value buffer */
short ntok; /* number of tokens */
char *tok[SHELL_MAXTOK]; /* pointers to token values */
char *outname; /* name of output file */
char *inname; /* name of input file */
bool background; /* is background proccess? */
syscall child; /* pid of child thread */
ushort i, j; /* temp variables */
irqmask im; /* interrupt mask state */
/* hostname variables */
char hostnm[NET_HOSTNM_MAXLEN + 1]; /* hostname of backend */
char *hostptr; /* pointer to hostname */
int hostname_strsz; /* nvram hostname name size */
device *devptr; /* device pointer */
printf( "Welcome to the shell!\n" );
/* Enable interrupts */
enable();
hostptr = NULL;
devptr = NULL;
hostname_strsz = 0;
bzero(hostnm, NET_HOSTNM_MAXLEN + 1);
/* Setup buffer for string for nvramGet call for hostname */
#ifdef ETH0
if (!isbaddev(ETH0))
{
/* Determine the hostname of the main network device */
devptr = (device *)&devtab[ETH0];
hostname_strsz = strnlen(NET_HOSTNAME, NVRAM_STRMAX) + 1;
hostname_strsz += DEVMAXNAME;
char nvramget_hostname_str[hostname_strsz];
sprintf(nvramget_hostname_str, "%s_%s", devptr->name,
NET_HOSTNAME);
/* Acquire the backend's hostname */
#if NVRAM
hostptr = nvramGet(nvramget_hostname_str);
#endif /* NVRAM */
if (hostptr != NULL)
{
memcpy(hostnm, hostptr, NET_HOSTNM_MAXLEN);
hostptr = hostnm;
}
}
#endif
/* Set command devices for input, output, and error */
stdin = indescrp;
stdout = outdescrp;
stderr = errdescrp;
//Initialize the job control shell
init();
/* Print shell banner */
printf(SHELL_BANNER);
/* Print shell welcome message */
printf(SHELL_START);
/* Continually receive and handle commands */
while (TRUE)
{
/* Display prompt */
printf(SHELL_PROMPT);
if (NULL != hostptr)
{
printf("@%s$ ", hostptr);
}
else
{
printf("$ ");
}
/* Setup proper tty modes for input and output */
control(stdin, TTY_CTRL_CLR_IFLAG, TTY_IRAW, NULL);
control(stdin, TTY_CTRL_SET_IFLAG, TTY_ECHO, NULL);
/* Read command */
buflen = read(stdin, buf, SHELL_BUFLEN - 1);
/* Check for EOF and exit gracefully if seen */
if (EOF == buflen)
{
break;
}
/* Parse line input into tokens */
if (SYSERR == (ntok = lexan(buf, buflen, &tokbuf[0], &tok[0])))
{
fprintf(stderr, SHELL_SYNTAXERR);
continue;
}
/* Ensure parse generated tokens */
if (0 == ntok)
{
continue;
}
/* Initialize command options */
inname = NULL;
outname = NULL;
background = FALSE;
/* Mark as background thread, if last token is '&' */
if ('&' == *tok[ntok - 1])
{
ntok--;
background = TRUE;
}
/* Check each token and perform special handling of '>' and '<' */
for (i = 0; i < ntok; i++)
{
/* Background '&' should have already been handled; Syntax error */
if ('&' == *tok[i])
{
ntok = -1;
break;
}
/* Setup for output redirection if token is '>' */
if ('>' == *tok[i])
{
/* Syntax error */
if (outname != NULL || i >= ntok - 1)
{
ntok = -1;
break;
}
outname = tok[i + 1];
ntok -= 2;
/* shift tokens (not to be passed to command */
for (j = i; j < ntok; j++)
{
tok[j] = tok[j + 2];
}
continue;
}
/* Setup for input redirection if token is '<' */
if ('<' == *tok[i])
{
/* Syntax error */
if (inname != NULL || i >= ntok - 1)
{
ntok = -1;
break;
}
inname = tok[i + 1];
ntok -= 2;
/* shift tokens (not to be passed to command */
for (j = i; j < ntok; j++)
{
tok[j] = tok[j + 2];
}
continue;
}
}
/* Handle syntax error */
if (ntok <= 0)
{
fprintf(stderr, SHELL_SYNTAXERR);
continue;
}
/* Lookup first token in the command table */
for (i = 0; i < ncommand; i++)
{
if (0 == strncmp(commandtab[i].name, tok[0], SHELL_BUFLEN))
{
break;
}
}
/* Handle command not found */
if (i >= ncommand)
{
fprintf(stderr, "%s: command not found\n", tok[0]);
continue;
}
/* Handle command if it is built-in */
if (commandtab[i].builtin)
{
if (inname != NULL || outname != NULL || background)
{
fprintf(stderr, SHELL_SYNTAXERR);
}
else
{
(*commandtab[i].procedure) (ntok, tok);
}
continue;
}
/* Spawn child thread for non-built-in commands */
child =
create(commandtab[i].procedure,
SHELL_CMDSTK, SHELL_CMDPRIO,
commandtab[i].name, 2, ntok, tok);
/* Ensure child command thread was created successfully */
if (SYSERR == child)
{
fprintf(stderr, SHELL_CHILDERR);
continue;
}
/* Set file descriptors for newly created thread */
if (NULL == inname)
{
thrtab[child].fdesc[0] = stdin;
}
else
{
thrtab[child].fdesc[0] = getdev(inname);
}
if (NULL == outname)
{
thrtab[child].fdesc[1] = stdout;
}
else
{
thrtab[child].fdesc[1] = getdev(outname);
}
thrtab[child].fdesc[2] = stderr;
if (background)
{
/* Make background thread ready, but don't reschedule */
im = disable();
ready(child, RESCHED_NO);
restore(im);
int jobID = generateJob();
printf( "[%d] %s\n", jobID, tok[0]);
}
else
{
/* Clear waiting message; Reschedule; */
while (recvclr() != NOMSG);
im = disable();
ready(child, RESCHED_YES);
restore(im);
/* Wait for command thread to finish */
while (receive() != child);
sleep(10);
}
}
/* Close shell */
fprintf(stdout, SHELL_EXIT);
sleep(10);
return OK;
}
