static void prCmd(Cmd c, int inPipeId, int outPipeId)
{
int i;
if ( c ) {
/*
printf("%s%s ", c->exec == Tamp ? "BG " : "", c->args[0]);
if ( c->in == Tin )
printf("<(%s) ", c->infile);
if ( c->out != Tnil )
switch ( c->out ) {
case Tout:
printf(">(%s) ", c->outfile);
break;
case Tapp:
printf(">>(%s) ", c->outfile);
break;
case ToutErr:
printf(">&(%s) ", c->outfile);
break;
case TappErr:
printf(">>&(%s) ", c->outfile);
break;
case Tpipe:
printf("| ");
break;
case TpipeErr:
printf("|& ");
break;
default:
fprintf(stderr, "Shouldn't get here\n");
exit(-1);
}
if ( c->nargs > 1 ) {
printf("[");
for ( i = 1; c->args[i] != NULL; i++ )
printf("%d:%s,", i, c->args[i]);
printf("\b]");
}
//printf("\nThe C-In is: %d", c->in);
//printf("\nThe C-Out is: %d", c->out);
putchar('\n');
*/
// this driver understands one command
if(!isBuiltinCommand(c->args[0]))
{
execcommand(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "echo") == 0)
{
//printf("Executing echo: in and out pipes are: %d %d", inPipeId, outPipeId );
exececho(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "pwd") == 0)
{
//printf("Executing echo: in and out pipes are: %d %d", inPipeId, outPipeId );
execpwd(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "setenv") == 0)
{
//printf("Executing getenv: in and out pipes are: %d %d", inPipeId, outPipeId );
execsetenv(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "unsetenv") == 0)
{
//printf("Executing getenv: in and out pipes are: %d %d", inPipeId, outPipeId );
execunsetenv(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "nice") == 0)
{
//printf("Executing getenv: in and out pipes are: %d %d", inPipeId, outPipeId );
execnice(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "cd") == 0)
{
//printf("Executing getenv: in and out pipes are: %d %d", inPipeId, outPipeId );
execcd(c, inPipeId, outPipeId);
}
else if(strcmp(c->args[0], "where") == 0)
{
//printf("Executing getenv: in and out pipes are: %d %d", inPipeId, outPipeId );
execwhere(c, inPipeId, outPipeId);
}
else if ( !strcmp(c->args[0], "logout") )
exit(0);
else if ( !strcmp(c->args[0], "end") )
exit(0);
//putchar('\n');
}
}
int main(int argc, char *argv[]) {
//Initialize the shell
init_shell();
int numofpipes[MAXCMD];
//Initialize jobs array
init_jobsarray();
//Holds the command
char wholecommand[MAXNUM];
char dupwholecommand[MAXNUM];
char *cmdarr[MAXCMD][MAXOP]; //The rows hold commands separated by ;
//while the columns hold the command and its options separated by " " or \t
char *pipecmdarr[MAXCMD][MAXCMD][MAXOP];
char maincmd[MAXNUM];
//For prompt
char username[MAXNUM],sysname[MAXNUM],cwdir[MAXNUM];
char homedir[MAXNUM];
getcwd(homedir,MAXNUM);
char duphomedir[MAXNUM];
duphomedir[0] = '\0';
strcat(duphomedir,homedir);
//For tokenizing
char *str1 = NULL;
char *token = NULL;
//Counters
int i;
//Initializing background process array
for(i=0; i<(MAXNUM*MAXOP); i++) {
bgrounds[i].used = 0;
}
//Initializing ends
//Initialize to NULL
initarray(cmdarr);
char *hdir[MAXNUM];
//Tokenize home directory
tokenize(str1,hdir,token,duphomedir);
//Tokenize home directory done
while(1) {
if(signal(SIGINT,signal_handler)==SIG_ERR)
perror("Signal not caught!!");
if(signal(SIGCHLD,signal_handler)==SIG_ERR)
perror("Signal not caught!!");
for(i=0; i<MAXCMD; i++)
numofpipes[i] = 0;
rectifyjobsarray();
//Printing message on background process completion
for(i=0; i<(MAXNUM*MAXOP); i++) {
if(bgrounds[i].used == 0)
continue;
bgrounds[i].used = 0;
if(bgrounds[i].status == 1) {
//printf("Process %s with pid %d terminated normally\n",bgrounds[i].name,bgrounds[i].pid);
}
else {
//printf("Process %s with pid %d terminated with status %d\n",bgrounds[i].name,bgrounds[i].pid,bgrounds[i].status);
}
}
//Renitializing background process array
for(i=0; i<(MAXNUM*MAXOP); i++) {
bgrounds[i].used = 0;
}
//Renitializing ends
//Initialize to NULL
initarray(cmdarr);
initpipecmd(pipecmdarr);
//For prompt
username[0] = '\0';
cwdir[0] = '\0';
strcat(username,getlogin());
gethostname(sysname,MAXNUM);
getcwd(cwdir,MAXNUM);
char dupcwdir[MAXNUM];
dupcwdir[0] = '\0';
strcat(dupcwdir,cwdir);
directorysettings(cwdir,homedir,dupcwdir,hdir);
//Prompt settings done
//Take commands
printf("<%s@%s:%s>",username,sysname,cwdir);
wholecommand[0] = '\0';
dupwholecommand[0] = '\0';
readLine(wholecommand);
wholecommand[strlen(wholecommand)-1]='\0';
strcpy(dupwholecommand,wholecommand);
//Done taking commands
//Tokenize
maintokenize(cmdarr,dupwholecommand);
//tokentest(cmdarr);
pipetokenize(cmdarr,pipecmdarr,numofpipes);
//pipetokenizetest(cmdarr,pipecmdarr,numofpipes);
//exit(EXIT_SUCCESS);
//continue;
//Tokenize done
//Executing each ; separated command
for(i = 0; i< MAXCMD; i++) {
if(cmdarr[i][0] == NULL)
continue;
maincmd[0] = '\0';
strcat(maincmd,cmdarr[i][0]);
strcpy(infile,"\0");
strcpy(outfile,"\0");
if(numofpipes[i] != 0) { //Execute piped commands
pipesexecute(cmdarr, pipecmdarr, numofpipes, i);
continue;
}
if((strcmp(maincmd,"echo") == 0) || (strcmp(maincmd,"pwd") == 0) || (strcmp(maincmd,"cd") == 0)\
|| (strcmp(maincmd,"clear") == 0) || (strcmp(maincmd,"quit") == 0) || (strcmp(maincmd,"pinfo") == 0) ||
strcmp(maincmd,"jobs") == 0 || strcmp(maincmd,"overkill") == 0 || strcmp(maincmd,"kjob") == 0
|| strcmp(maincmd,"fg") == 0 ) {
int dupstdout = dup(1);
int dupstdin = dup(0);
if(checkinfile(cmdarr,i) == 1) {
if(strcmp(infile,"\0") != 0) {
int in=open(infile,O_RDONLY);
dup2(in,0);
close(in);
}
}
int outretval = checkoutfile(cmdarr,i);
if(outretval == 1 || outretval == 2) {
if(strcmp(outfile,"\0") != 0) {
if(outretval == 1) {
int out=open(outfile,O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IRGRP | S_IWGRP | S_IWUSR);
dup2(out,1);
close(out);
}
else {
if(fopen(outfile,"r") == NULL) {
int out=open(outfile,O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IRGRP | S_IWGRP | S_IWUSR);
dup2(out,1);
close(out);
}
else {
int out=open(outfile,O_WRONLY | O_APPEND, S_IRUSR | S_IRGRP | S_IWGRP | S_IWUSR);
dup2(out,1);
close(out);
}
}
}
}
//echo execution
if(strcmp (maincmd,"echo") == 0) {
exececho(wholecommand,cmdarr,i);
}
//echo done
//pwd execution
if(strcmp (maincmd,"pwd") == 0) {
execpwd();
}
//pwd done
//chdir execution
if(strcmp (maincmd,"cd") == 0) {
execcd(cmdarr,homedir,i);
}
//chdir done
//clear execution
if(strcmp (maincmd,"clear") == 0) {
printf("\e[1;1H\e[2J");
}
//clear done
//terminal quit
if(strcmp (maincmd,"quit") == 0) {
exit(EXIT_SUCCESS);
}
//terminal quit done
//jobs
if(strcmp (maincmd,"jobs") == 0) {
execjobs();
}
//jobs done
//overkill
if(strcmp (maincmd,"overkill") == 0) {
execoverkill();
}
//overkill done
//kjob
if(strcmp (maincmd,"kjob") == 0) {
execkjob(cmdarr,i);
}
//kjob done
//fg
if(strcmp (maincmd,"fg") == 0) {
execfg(cmdarr,i);
}
//fg done
//pinfo
if(strcmp (maincmd,"pinfo") == 0) {
pid_t proid;
int flag = 0;
if(cmdarr[i][1] == NULL) //pinfo of shell
proid = getpid();
else { //pinfo of given pid
char temps[MAXNUM];
strcpy(temps,cmdarr[i][1]);
proid = atoi(temps);
if(kill(proid,0) == (-1)) {
printf("No such process exists\n");
continue;
}
flag = 1;
}
getpinfo(proid, flag, homedir);
}
//pinfo done
dup2(dupstdin,0);
dup2(dupstdout,1);
}
else {
