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fgbg.c
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fgbg.c
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#include "headers.h"
int signalFlag22 = 0;
int anotherSignalFlag22 = 0;
void anotherSignalHandler22(int sig)
{
anotherSignalFlag22 = 1;
return;
}
void signalHandler22(int sig)
{
signalFlag22 = 1;
return;
}
void shell_fg(char ** command, int processes[], int *sz_proc)
{
signalFlag22 = 0;
anotherSignalFlag22 = 0;
int total_commands = 0;
while(command[total_commands] != NULL)
total_commands++;
if(total_commands != 2)
{
perror("Usage: fg <jobnumber>\n");
return;
}
int i = 0;
while(command[1][i] != '\0')
{
if(command[1][i] > '9' || command[1][i] < '0')
{
perror("Usage: fg <jobnumber>\n");
return;
}
i++;
}
int jobnumber = atoi(command[1]);
int cntr = 1;
for(i = 0 ; i < 1000 ; i++)
{
if(processes[i] == -1)
continue;
if(cntr == jobnumber)
{
int current_pid = processes[i];
processes[i] = -1;
int status;
signal(SIGINT, signalHandler22);
signal(SIGTSTP, anotherSignalHandler22);
kill(current_pid, SIGCONT);
while(waitpid(current_pid, &status, WNOHANG) != current_pid)
{
if(signalFlag22 == 1)
{
kill(current_pid, SIGINT);
signalFlag22 = 0;
break;
}
if(anotherSignalFlag22 == 1)
{
kill(current_pid,SIGSTOP);
processes[*sz_proc] = current_pid;
(*sz_proc)++;
anotherSignalFlag22 = 0;
break;
}
}
break;
}
cntr++;
}
if(cntr != jobnumber)
perror("Invalid jobnumber\n");
return;
}
void shell_bg(char ** command, int processes[])
{
int total_commands = 0;
while(command[total_commands] != NULL)
total_commands++;
if(total_commands != 2)
{
perror("Usage: fg <jobnumber>\n");
return;
}
int i = 0;
while(command[1][i] != '\0')
{
if(command[1][i] > '9' || command[1][i] < '0')
{
perror("Usage: fg <jobnumber>\n");
return;
}
i++;
}
int jobnumber = atoi(command[1]);
int cntr = 1;
for(i = 0 ; i < 1000 ; i++)
{
if(processes[i] == -1)
continue;
if(cntr == jobnumber)
{
int status;
kill(processes[i], SIGCONT);
break;
}
cntr++;
}
if(cntr != jobnumber)
perror("Invalid jobnumber\n");
return;
}