25개 이상의 토픽을 선택하실 수 없습니다.
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
401 lines
7.4 KiB
401 lines
7.4 KiB
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <dirent.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include "yeeshell.h"
|
|
|
|
/* record cmdline history */
|
|
char *history[CMDLINE_HISTORY_MAX_QUANTITY];
|
|
int cmdline_amount = 0;
|
|
|
|
int main()
|
|
{
|
|
char *cmdline = NULL, *pwd = NULL;
|
|
char *args[ARGS_MAX_QUANTITY];
|
|
int status = 1;
|
|
pwd = (char *)calloc(PATH_MAX_SIZE, sizeof(char));
|
|
for (int i = 0; i < CMDLINE_HISTORY_MAX_QUANTITY; i++)
|
|
{
|
|
history[i] = (char *)calloc(CMDLINE_MAX_SIZE, sizeof(char));
|
|
}
|
|
|
|
/* execute the shell's read, parse and execution loop */
|
|
do
|
|
{
|
|
if (!getcwd(pwd, PATH_MAX_SIZE))
|
|
{
|
|
printf("yeeshell: The current path cannot be obtained!\n");
|
|
exit(0);
|
|
}
|
|
printf("[root@yeeshell %s]# ", pwd);
|
|
cmdline = readline();
|
|
strcpy(history[cmdline_amount++], cmdline);
|
|
status = execute(cmdline, args);
|
|
free(cmdline);
|
|
} while (status);
|
|
for (int i = 0; i < CMDLINE_HISTORY_MAX_QUANTITY; i++)
|
|
{
|
|
free(history[i]);
|
|
}
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
char *readline()
|
|
{
|
|
char *cmdline = NULL;
|
|
ssize_t bufsize = 0;
|
|
getline(&cmdline, &bufsize, stdin);
|
|
return cmdline;
|
|
}
|
|
|
|
int parseline(char *cmdline, char **args)
|
|
{
|
|
static char array[CMDLINE_MAX_SIZE]; /* holds local copy of command line */
|
|
char *buf = array; /* ptr that traverses command line */
|
|
char *delim; /* points to first space delimiter */
|
|
int argc; /* number of args */
|
|
int bg; /* background job? */
|
|
|
|
strcpy(buf, cmdline);
|
|
buf[strlen(buf) - 1] = ' '; /* replace trailing '\n' with space */
|
|
while (*buf && (*buf == ' ')) /* ignore leading spaces */
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
/* Build the argv list */
|
|
argc = 0;
|
|
if (*buf == '\'')
|
|
{
|
|
buf++;
|
|
delim = strchr(buf, '\'');
|
|
}
|
|
else
|
|
{
|
|
delim = strchr(buf, ' ');
|
|
}
|
|
|
|
while (delim)
|
|
{
|
|
args[argc++] = buf;
|
|
*delim = '\0';
|
|
buf = delim + 1;
|
|
while (*buf && (*buf == ' ')) /* ignore spaces */
|
|
{
|
|
buf++;
|
|
}
|
|
|
|
if (*buf == '\'')
|
|
{
|
|
buf++;
|
|
delim = strchr(buf, '\'');
|
|
}
|
|
else
|
|
{
|
|
delim = strchr(buf, ' ');
|
|
}
|
|
}
|
|
args[argc] = NULL;
|
|
|
|
if (argc == 0) /* ignore blank line */
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* should the job run in the background? */
|
|
if ((bg = (*args[argc - 1] == '&')) != 0)
|
|
{
|
|
args[--argc] = NULL;
|
|
}
|
|
return bg;
|
|
}
|
|
|
|
int check_redirect(char **args, char *redirect_filename, char **redirect_args)
|
|
{
|
|
int i = 0, j = 0, redirect_flag = REDIRECT_NO;
|
|
while (args[i] != NULL)
|
|
{
|
|
if (!strcmp(args[i], ">"))
|
|
{
|
|
redirect_flag = REDIRECT_OUT;
|
|
break;
|
|
}
|
|
else if (!strcmp(args[i], "<"))
|
|
{
|
|
redirect_flag = REDIRECT_IN;
|
|
break;
|
|
}
|
|
i++;
|
|
}
|
|
|
|
if ((redirect_flag == 1) || (redirect_flag == 2))
|
|
{
|
|
strcpy(redirect_filename, args[i + 1]);
|
|
for (j = 0; j < i; j++)
|
|
{
|
|
redirect_args[j] = args[j];
|
|
}
|
|
}
|
|
|
|
return redirect_flag;
|
|
}
|
|
|
|
int check_pipe(char **args, char **pipe_arg_1, char **pipe_arg_2)
|
|
{
|
|
int pipe_flag = 0, i = 0, j = 0;
|
|
|
|
while (args[i] != NULL)
|
|
{
|
|
if (!strcmp(args[i], "|"))
|
|
{
|
|
pipe_flag = 1;
|
|
break;
|
|
}
|
|
pipe_arg_1[j++] = args[i++];
|
|
}
|
|
pipe_arg_1[j] = NULL;
|
|
|
|
j = 0;
|
|
i++;
|
|
while (args[i] != NULL)
|
|
{
|
|
pipe_arg_2[j++] = args[i++];
|
|
}
|
|
pipe_arg_2[j] = NULL;
|
|
return pipe_flag;
|
|
}
|
|
|
|
int execute(char *cmdline, char **args)
|
|
{
|
|
int bg = 0, i = 0, redirect_flag = 0, fd = 1, pipe_num = 0;
|
|
pid_t pid;
|
|
char *redirect_filename = NULL;
|
|
char *redirect_args[ARGS_MAX_QUANTITY];
|
|
char *pipe_arg_1[ARGS_MAX_QUANTITY];
|
|
char *pipe_arg_2[ARGS_MAX_QUANTITY];
|
|
|
|
redirect_filename = (char *)calloc(REDIRECT_FILENAME_MAX_SIZE, sizeof(char));
|
|
memset(redirect_args, NULL, sizeof(redirect_args));
|
|
|
|
bg = parseline(cmdline, args);
|
|
redirect_flag = check_redirect(args, redirect_filename, redirect_args);
|
|
pipe_num = check_pipe(args, pipe_arg_1, pipe_arg_2);
|
|
|
|
if (args[0] == NULL)
|
|
{
|
|
return 1;
|
|
}
|
|
if (pipe_num == 0) /* no pipe */
|
|
{
|
|
if (!built_in(args)) /* built-in cmd? */
|
|
{
|
|
if ((pid = fork()) == 0) /* Child process */
|
|
{
|
|
if (redirect_flag == 1) /* redirect? */
|
|
{
|
|
fd = open(redirect_filename, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR | S_IXUSR);
|
|
close(1);
|
|
dup(fd);
|
|
}
|
|
else if (redirect_flag == 2)
|
|
{
|
|
fd = open(redirect_filename, O_RDONLY, S_IRUSR);
|
|
close(0);
|
|
dup(fd);
|
|
}
|
|
|
|
if ((redirect_flag == 1) || (redirect_flag == 2))
|
|
{
|
|
|
|
if (execvp(redirect_args[0], redirect_args) <= 0)
|
|
{
|
|
printf("%s: Command not found\n", args[0]);
|
|
exit(0);
|
|
}
|
|
close(fd);
|
|
}
|
|
else
|
|
{
|
|
if (execvp(args[0], args) <= 0)
|
|
{
|
|
printf("%s: Command not found\n", args[0]);
|
|
exit(0);
|
|
}
|
|
}
|
|
}
|
|
else /* parent process */
|
|
{
|
|
if (bg)
|
|
{
|
|
signal(SIGCHLD, SIG_IGN);
|
|
}
|
|
else
|
|
{
|
|
waitpid(pid, NULL, 0);
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int fds[2];
|
|
pipe(fds);
|
|
pid_t prog_1, prog_2;
|
|
|
|
printf("%s %s %s %s", pipe_arg_1[0], pipe_arg_1[1], pipe_arg_1[2], pipe_arg_1[3]);
|
|
|
|
if ((prog_1 = fork()) == 0) /* Child process 1 */
|
|
{
|
|
close(1);
|
|
dup(fds[1]);
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
|
|
if (execvp(pipe_arg_1[0], pipe_arg_1) <= 0)
|
|
{
|
|
printf("%s: Command not found\n", pipe_arg_1[0]);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
if ((prog_2 = fork()) == 0) /* Child process 1 */
|
|
{
|
|
|
|
dup2(fds[0], 0);
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
|
|
if (execvp(pipe_arg_2[0], pipe_arg_2) <= 0)
|
|
{
|
|
printf("%s: Command not found\n", pipe_arg_2[0]);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
|
|
waitpid(prog_1, NULL, 0);
|
|
waitpid(prog_2, NULL, 0);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int built_in(char **args)
|
|
{
|
|
if (!strcmp(args[0], "exit"))
|
|
{
|
|
exit(0);
|
|
}
|
|
else if (!strcmp(args[0], "cd"))
|
|
{
|
|
return builtin_cd(args);
|
|
}
|
|
else if (!strcmp(args[0], "history"))
|
|
{
|
|
return builtin_history(args);
|
|
}
|
|
else if (!strcmp(args[0], "mytop"))
|
|
{
|
|
int flag = builtin_mytop();
|
|
if (flag == -1)
|
|
{
|
|
printf("yeeshell: unable to get memory info.\n");
|
|
}
|
|
else if (flag == -2)
|
|
{
|
|
printf("yeeshell: unable to get CPU info.\n");
|
|
}
|
|
return flag;
|
|
}
|
|
else
|
|
{
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int builtin_cd(char **args)
|
|
{
|
|
if (args[1] == NULL)
|
|
{
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
if (chdir(args[1]) != 0)
|
|
{
|
|
perror("yeeshell");
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
int builtin_history(char **args)
|
|
{
|
|
int n = 0;
|
|
if (args[1] == NULL)
|
|
{
|
|
n = cmdline_amount;
|
|
}
|
|
else
|
|
{
|
|
n = atoi(args[1]) < cmdline_amount ? atoi(args[1]) : cmdline_amount;
|
|
}
|
|
printf("ID\tCommandline\n");
|
|
for (int i = 0; i < n; i++)
|
|
{
|
|
printf("%d\t%s\n", i + 1, history[i]);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int builtin_mytop()
|
|
{
|
|
int memory_flag = 0, CPU_flag = 0;
|
|
memory_flag = mytop_memory();
|
|
CPU_flag = mytop_CPU();
|
|
if (!memory_flag)
|
|
{
|
|
return -1;
|
|
}
|
|
else if (!CPU_flag)
|
|
{
|
|
return -2;
|
|
}
|
|
else
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
int mytop_memory()
|
|
{
|
|
FILE *fp = NULL;
|
|
int pagesize;
|
|
long total = 0, free = 0, cached = 0;
|
|
|
|
if ((fp = fopen("/proc/meminfo", "r")) == NULL)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
fscanf(fp, "%u %lu %lu %lu", &pagesize, &total, &free, &cached);
|
|
fclose(fp);
|
|
|
|
printf("memmory(KBytes):\t%ld total\t%ld free\t%ld cached\n", (pagesize * total) / 1024, (pagesize * free) / 1024, (pagesize * cached) / 1024);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int mytop_CPU()
|
|
{
|
|
}
|