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main.c
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main.c
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// Raza Rauf
// main.cpp
// chell project
//
// The program implements Unix shell commands using C.
#include "chell.h"
int main(int argc, char * argv[], char **envp)
{
//The following two functions catch and process the interrupt and stop signals
//AKA signals sent by the Ctrl-C and Ctrl-Z commands
if (signal(SIGINT,signal_catcher)==SIG_ERR)
{
perror("Sigset cannot set SIGINT");
exit(SIGINT);
}
if (signal(SIGTSTP, signal_catcher)==SIG_ERR)
{
perror("Sigset can not set SIGTSTP");
exit(SIGTSTP);
}
//Declaring and initializing variables to be used later
initHistory();
initAlias();
int this_input = 0;
char * input = (char *) malloc(sizeof(char)*64);
strcpy (input, "noexit");
char *shellname = (char *) malloc(sizeof(char)*32);
strcpy (shellname, "myshell");
setShellName(shellname);
printf ("[%s]%% ", shellname);
input = getLine(input, 100);
//Making sure the program does not crash if the input simply the return key
while (strcmp(input,"\0") == 0)
{
printf ("[%s]%% ", shellname);
input = getLine(input, 100);
}
setHistory(input);
breakLine (input);
this_input = whichInput();
char ** argrv = getargrv();
int argrc = getargrc();
int loop = 1;
while (loop != 0)
{
//Loop and process commands until the exist command is entered
if(this_input==4) {
if(strcmp(argrv[argrc-1], "&")==0)
{
//printf("Before forking PID:%d\n", getpid());
int pid = fork();
if(pid==0)
{
//sleep(2); //putting a delay in to emphasize background process
//printf("\nchild PID: %d\n", getpid());
decrargrc();
list();
//printf("\nIn the child process - ended.\n\n");
return 0;
} else
{
//printf("PPID:%d\n", getpid());
//printf("In the parent process.\n");
printf("%s process running in background", argrv[0]);
}
} else
list();
} else if(this_input==3) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
pwd();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
pwd();
} else if(this_input==6) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
prompt();
shellname = getShellName();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
{
prompt();
shellname = getShellName();
}
} else if(this_input==2) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
dirChange();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
dirChange();
} else if(this_input==5) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
mypid();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
mypid();
} else if(this_input==1) {
if (getargrc() == 1)
{
loop = 0;
free (input);
free (shellname);
input = NULL;
shellname = NULL;
freeDynamicMem();
return 0;
} else {
printf("%s: Arguments not valid.", argrv[0]);
}
} else if(this_input==7) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
printHistory();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
printHistory();
} else if(this_input==8) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
printf("\n***I've put a 3 second delay in to emphasize this background process\n");
sleep(3); //putting a delay in to emphasize background proces
decrargrc();
printEnv(envp);
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
printEnv(envp);
}else if(this_input==9) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
alias();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
alias();
}else if(this_input==10) {
if(strcmp(argrv[argrc-1], "&")==0)
{
int pid = fork();
if(pid==0)
{
decrargrc();
murder();
return 0;
} else
printf("%s process running in background", argrv[0]);
} else
murder();
}else {
nocmd(input);
}
printf ("\n[%s]%% ", shellname);
input = getLine(input, 100);
while (strcmp(input,"\0") == 0)
{
printf ("[%s]%% ", shellname);
input = getLine(input, 100);
}
setHistory(input);
breakLine (input);
this_input = whichInput();
argrv = getargrv();
argrc = getargrc();
}
return 0;
}