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run_command.c
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558 lines (520 loc) · 12.1 KB
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#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include "prompt.h"
#include "read_command.h"
#include "utility.h"
// to handle jobs and fg
int CURRENT_PID;
char *suspended_commands[100];
int suspended_pids[100];
int sj_counter = 0;
char *CURRENT_COMMAND;
void signal_handler(int sig)
{
if ((sig == SIGTSTP || sig == SIGSTOP) && CURRENT_PID >=0)
{
suspended_commands[sj_counter] = CURRENT_COMMAND;
suspended_pids[sj_counter] = CURRENT_PID;
sj_counter++;
}
signal(sig, signal_handler);
}
void print_suspended_jobs()
{
for(int i=0; i<sj_counter ;i++)
{
printf("[%d] %s\n",i+1, suspended_commands[i]);
fflush(stdout);
}
}
void run_fg(char s_index[])
{
int index = atoi(s_index);
if (index != 0 && index-1 < sj_counter)
{
int pid = suspended_pids[index-1];
CURRENT_COMMAND = strdup(suspended_commands[index-1]);
for (int i=index-1;i< sj_counter-1 ;i++)
{
suspended_commands[i] = strdup(suspended_commands[i+1]);
suspended_pids[i] = suspended_pids[i+1];
}
sj_counter--;
kill(pid, SIGCONT);
CURRENT_PID = pid;
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
}
else
{
fprintf(stderr, "Error: invalid job\n");
return;
}
}
int built_in_commands(char command[])
{
char *parameters[900], *cmd_split[100];
int j=0, pid;
char * ptr_cmd = strtok(command, " ");
int argc = split_command(ptr_cmd, cmd_split);
for(j=0; j<argc;j++)
{
parameters[j] = cmd_split[j];
}
parameters[argc] = NULL;
int cmd_type = get_case(parameters[0]);
switch (cmd_type)
{
case 0: // exit
if (argc > 1)
{
fprintf(stderr, "Error: invalid command\n");
return -2;
}
else
{
if (sj_counter > 0)
{
fprintf(stderr, "Error: there are suspended jobs\n");
return -2;
}
else
{
exit(1);
}
}
break;
case 1: // cd
if (argc == 1 || argc>2)
{
fprintf(stderr, "Error: invalid command\n");
return -2;
}
else if(chdir(parameters[1]) == -1)
{
fprintf(stderr, "Error: invalid directory\n");
return -2;
}
break;
case 2: //fg
if (argc == 1 || argc>2)
{
fprintf(stderr, "Error: invalid command\n");
return -2;
}
else
{
run_fg(parameters[1]);
}
break;
case 3: //jobs
if (argc > 1)
{
fprintf(stderr, "Error: invalid command\n");
return -2;
}
else
{
print_suspended_jobs();
}
break;
default:
pid = fork();
if ( pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_COMMAND = strdup(command);
CURRENT_PID = pid;
if(pid == 0)
{
run_execve(parameters[0], parameters);
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
break;
}
return 1;
}
int redirection_commands(char command[], int redirect)
{
char *ptr_cmd;
char filename[100], filename2[100];
char *cmd_split[100], *cmd_array[100];
int fd, fd2, pid, ori_fd, ori_fd_in, ori_fd_out;
CURRENT_COMMAND = strdup(command);
switch (redirect)
{
case 1: // < in
ptr_cmd = strtok(command, "<");
extract_command(ptr_cmd, cmd_split, cmd_array);
strcpy(filename, cmd_split[1]);
if((fd = open(filename, O_RDONLY, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
ori_fd = dup(STDIN_FILENO);
pid = fork();
if ( pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid;
if(pid == 0)
{
dup2(fd, STDIN_FILENO);
close(fd);
fflush(stdout);
run_execve(cmd_array[0], cmd_array);
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
close(fd);
dup2(ori_fd, fd);
break;
case 2: // > out
ptr_cmd = strtok(command, ">");
extract_command(ptr_cmd, cmd_split, cmd_array);
strcpy(filename, cmd_split[1]);
if((fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
ori_fd = dup(STDOUT_FILENO);
pid = fork();
if ( pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid;
if(pid == 0)
{
dup2(fd, STDOUT_FILENO); // send 'out' the content of terminal to a file
close(fd);
run_execve(cmd_array[0], cmd_array);
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
close(fd);
dup2(ori_fd, fd);
break;
case 3: // >> append
ptr_cmd = strtok(command, ">");
extract_command(ptr_cmd, cmd_split, cmd_array);
strcpy(filename, cmd_split[2]);
if((fd = open(filename, O_WRONLY | O_APPEND, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
ori_fd = dup(STDOUT_FILENO);
pid = fork();
if ( pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid;
if(pid == 0)
{
dup2(fd, STDOUT_FILENO);
close(fd);
run_execve(cmd_array[0], cmd_array);
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
close(fd);
dup2(ori_fd, fd);
break;
case 4: // < in > out
ptr_cmd = strtok(command, "<");
extract_command(ptr_cmd, cmd_split, cmd_array);
strcpy(filename, cmd_split[1]);
strcpy(filename2, cmd_split[3]);
if((fd = open(filename, O_RDONLY, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
if((fd2 = open(filename2, O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
ori_fd_in = dup(STDIN_FILENO);
ori_fd_out = dup(STDOUT_FILENO);
pid = fork();
if (pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid;
if(pid == 0)
{
dup2(fd, STDIN_FILENO);
close(fd);
dup2(fd2, STDOUT_FILENO); // send 'out' the content of terminal to a file
close(fd2);
run_execve(cmd_array[0], cmd_array);
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
close(fd);
close(fd2);
dup2(ori_fd_in, fd);
dup2(ori_fd_out, fd2);
break;
case 5: // < in >> append
ptr_cmd = strtok(command, "<");
extract_command(ptr_cmd, cmd_split, cmd_array);
strcpy(filename, cmd_split[1]);
strcpy(filename2, cmd_split[3]);
if((fd = open(filename, O_RDONLY, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
if((fd2 = open(filename2, O_WRONLY | O_APPEND, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
ori_fd_in = dup(STDIN_FILENO);
ori_fd_out = dup(STDOUT_FILENO);
pid = fork();
if ( pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid;
if(pid == 0)
{
dup2(fd, STDIN_FILENO);
close(fd);
dup2(fd2, STDOUT_FILENO); // send 'out' the content of terminal to a file
close(fd2);
run_execve(cmd_array[0], cmd_array);
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
close(fd);
close(fd2);
dup2(ori_fd_in, fd);
dup2(ori_fd_out, fd2);
break;
default:
break;
}
return 1;
}
int simulate_pipe(char command[], int pipe_count, char *to_pipe[])
{
CURRENT_COMMAND = strdup(command);
int index = 0;
int fd[pipe_count][2];
int store_pid[pipe_count+1];
char *cmd_array[100];
int fd_in, fd_out, ori_stdin, ori_stdout;
int in_redirect=0, out_redirect=0;
for(int i = 0; i < pipe_count; i++) {
if (pipe(fd[i]) == -1)
{
// close all the opened fds till now
for(int m = 0; m <= i-1; m++) {
close(fd[m][0]);
close(fd[m][1]);
}
fprintf(stderr, "Error: pipe\n");
return -1;
}
}
// read
in_redirect = if_has_redirection(to_pipe[index]);
if (in_redirect == 1)
{
char *ptr_cmd;
char filename[100];
char *cmd_split[100];
ori_stdin = dup(STDIN_FILENO);
ptr_cmd = strtok(to_pipe[index], "<");
extract_command(ptr_cmd, cmd_split, cmd_array);
strcpy(filename, cmd_split[1]);
if((fd_in = open(filename, O_RDONLY, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
dup2(ori_stdin, fd_in);
close(ori_stdin);
}
dup2(fd_in, STDIN_FILENO);
close(fd_in);
}
else
{
remove_space(cmd_array, to_pipe[index]);
}
int pid_0 = fork();
store_pid[index] = pid_0;
if (pid_0 < 0)
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid_0;
if(pid_0 == 0)
{
dup2(fd[0][1], STDOUT_FILENO);
for(int i = 0; i < pipe_count; i++) {
close(fd[i][0]);
close(fd[i][1]);
}
run_execve(cmd_array[0], cmd_array);
}
CURRENT_PID = -1;
clear_command(cmd_array);
// intermediate
for(int idx=1; idx<pipe_count; idx++)
{
index+=1;
remove_space(cmd_array, to_pipe[index]);
int pid_in = fork();
store_pid[index] = pid_in;
if (pid_in < 0)
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid_in;
if (pid_in == 0)
{
dup2(fd[index -1][0], STDIN_FILENO);
dup2(fd[index][1], STDOUT_FILENO);
for(int i = 0; i < pipe_count; i++) {
close(fd[i][0]);
close(fd[i][1]);
}
run_execve(cmd_array[0], cmd_array);
}
CURRENT_PID = -1;
clear_command(cmd_array);
}
// write
index+=1;
out_redirect = if_has_redirection(to_pipe[index]);
if (out_redirect > 1)
{
char *ptr_cmd;
char filename[100];
char *cmd_split[100];
ori_stdout = dup(STDOUT_FILENO);
ptr_cmd = strtok(to_pipe[index], ">");
extract_command(ptr_cmd, cmd_split, cmd_array);
if (out_redirect == 2)
{
strcpy(filename, cmd_split[1]);
if((fd_out = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
}
}
else if (out_redirect == 3)
{
strcpy(filename, cmd_split[2]);
if((fd_out = open(filename, O_WRONLY | O_APPEND, 0644)) < 0)
{
fprintf(stderr, "Error: invalid file\n");
return -2;
dup2(ori_stdout, fd_out);
close(ori_stdout);
}
}
dup2(fd_out, STDOUT_FILENO);
close(fd_out);
}
else
{
remove_space(cmd_array, to_pipe[index]);
}
int pid_pc = fork();
store_pid[index] = pid_pc;
if (pid_pc < 0)
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid_pc;
if (pid_pc == 0)
{
dup2(fd[index-1][0], STDIN_FILENO);
for(int i = 0; i < pipe_count; i++) {
close(fd[i][0]);
close(fd[i][1]);
}
run_execve(cmd_array[0], cmd_array);
}
CURRENT_PID = -1;
clear_command(cmd_array);
// restore original fds
if (in_redirect == 1)
{
dup2(ori_stdin, STDIN_FILENO);
close(ori_stdin);
}
if (out_redirect > 1)
{
dup2(ori_stdout, STDOUT_FILENO);
close(ori_stdout);
}
// close all the fds in parent
for(int i = 0; i < pipe_count; i++) {
close(fd[i][0]);
close(fd[i][1]);
}
run_waitpid(pipe_count, store_pid);
return 1;
}
int locate_program(char command[])
{
CURRENT_COMMAND = strdup(command);
char *ptr_cmd;
char *cmd_split[100], *cmd_array[100];
ptr_cmd = strtok(command, " ");
extract_command(ptr_cmd, cmd_split, cmd_array);
if((cmd_array[0][0] != '.') && (cmd_array[0][1] != '/'))
{
char path[100] = "./";
strcat(path, cmd_array[0]);
cmd_array[0] = path;
}
int pid = fork();
if ( pid < 0 )
{
fprintf(stderr, "Error: fork()\n");
return -1;
}
CURRENT_PID = pid;
if(pid == 0)
{
if (execvp(cmd_array[0], cmd_array) == -1)
{
fprintf(stderr, "Error: invalid program\n");
exit(-1);
}
}
waitpid(-1, NULL, WUNTRACED);
CURRENT_PID = -1;
return 1;
}