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703 rader
12 KiB
703 rader
12 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <dirent.h>
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#include <signal.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <termcap.h>
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#include <termios.h>
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#include <curses.h>
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#include <limits.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/times.h>
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#include <sys/time.h>
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#include <sys/select.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/type.h>
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#include <minix/endpoint.h>
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#include <minix/const.h>
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#include <minix/u64.h>
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#include <paths.h>
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#include <minix/procfs.h>
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#include "yeeshell.h"
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/* record cmdline history */
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char *history[CMDLINE_HISTORY_MAX_QUANTITY];
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int cmdline_amount = 0;
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struct proc *proc = NULL, *prev_proc = NULL;
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int nr_total = 0;
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unsigned int nr_procs, nr_tasks;
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int main()
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{
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char *cmdline = NULL, *pwd = NULL;
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char *args[ARGS_MAX_QUANTITY];
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int status = 1;
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pwd = (char *)calloc(PATH_MAX_SIZE, sizeof(char));
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for (int i = 0; i < CMDLINE_HISTORY_MAX_QUANTITY; i++)
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{
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history[i] = (char *)calloc(CMDLINE_MAX_SIZE, sizeof(char));
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}
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/* execute the shell's read, parse and execution loop */
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do
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{
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if (!getcwd(pwd, PATH_MAX_SIZE))
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{
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printf("yeeshell: The current path cannot be obtained!\n");
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exit(0);
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}
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printf("[root@yeeshell %s]# ", pwd);
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cmdline = readline();
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strcpy(history[cmdline_amount++], cmdline);
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status = execute(cmdline, args);
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free(cmdline);
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} while (status);
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for (int i = 0; i < CMDLINE_HISTORY_MAX_QUANTITY; i++)
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{
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free(history[i]);
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}
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exit(EXIT_SUCCESS);
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}
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char *readline()
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{
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char *cmdline = NULL;
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ssize_t bufsize = 0;
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getline(&cmdline, &bufsize, stdin);
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return cmdline;
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}
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int parseline(char *cmdline, char **args)
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{
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static char array[CMDLINE_MAX_SIZE]; /* holds local copy of command line */
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char *buf = array; /* ptr that traverses command line */
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char *delim; /* points to first space delimiter */
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int argc; /* number of args */
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int bg; /* background job? */
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strcpy(buf, cmdline);
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buf[strlen(buf) - 1] = ' '; /* replace trailing '\n' with space */
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while (*buf && (*buf == ' ')) /* ignore leading spaces */
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{
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buf++;
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}
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/* Build the argv list */
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argc = 0;
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if (*buf == '\'')
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{
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buf++;
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delim = strchr(buf, '\'');
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}
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else
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{
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delim = strchr(buf, ' ');
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}
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while (delim)
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{
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args[argc++] = buf;
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*delim = '\0';
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buf = delim + 1;
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while (*buf && (*buf == ' ')) /* ignore spaces */
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{
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buf++;
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}
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if (*buf == '\'')
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{
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buf++;
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delim = strchr(buf, '\'');
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}
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else
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{
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delim = strchr(buf, ' ');
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}
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}
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args[argc] = NULL;
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if (argc == 0) /* ignore blank line */
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{
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return 1;
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}
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/* should the job run in the background? */
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if ((bg = (*args[argc - 1] == '&')) != 0)
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{
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args[--argc] = NULL;
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}
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return bg;
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}
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int check_redirect(char **args, char *redirect_filename, char **redirect_args)
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{
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int i = 0, j = 0, redirect_flag = REDIRECT_NO;
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while (args[i] != NULL)
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{
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if (!strcmp(args[i], ">"))
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{
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redirect_flag = REDIRECT_OUT;
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break;
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}
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else if (!strcmp(args[i], "<"))
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{
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redirect_flag = REDIRECT_IN;
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break;
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}
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i++;
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}
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if ((redirect_flag == 1) || (redirect_flag == 2))
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{
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strcpy(redirect_filename, args[i + 1]);
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for (j = 0; j < i; j++)
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{
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redirect_args[j] = args[j];
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}
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}
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return redirect_flag;
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}
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int do_redirect(int redirect_flag, char *redirect_filename, char **redirect_args)
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{
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pid_t pid;
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int fd = 1;
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if ((pid = fork()) == 0) /* Child process */
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{
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if (redirect_flag == 1) /* in or out? */
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{
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fd = open(redirect_filename, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR | S_IXUSR);
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close(1);
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dup(fd);
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}
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else if (redirect_flag == 2)
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{
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fd = open(redirect_filename, O_RDONLY, S_IRUSR);
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close(0);
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dup(fd);
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}
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if (execvp(redirect_args[0], redirect_args) <= 0)
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{
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printf("%s: Command not found\n", redirect_args[0]);
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exit(0);
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}
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close(fd);
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}
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else /* parent process */
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{
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waitpid(pid, NULL, 0);
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}
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return 1;
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}
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int check_pipe(char **args, char **pipe_arg_1, char **pipe_arg_2)
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{
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int pipe_flag = 0, i = 0, j = 0;
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while (args[i] != NULL)
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{
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if (!strcmp(args[i], "|"))
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{
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pipe_flag = 1;
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break;
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}
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pipe_arg_1[j++] = args[i++];
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}
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pipe_arg_1[j] = NULL;
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j = 0;
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i++;
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while (args[i] != NULL)
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{
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pipe_arg_2[j++] = args[i++];
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}
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pipe_arg_2[j] = NULL;
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return pipe_flag;
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}
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int do_pipe(char **pipe_arg_1, char **pipe_arg_2)
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{
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int fds[2];
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pipe(fds);
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pid_t prog_1, prog_2;
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if ((prog_1 = fork()) == 0) /* Child process 1 */
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{
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close(1);
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dup(fds[1]);
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close(fds[0]);
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close(fds[1]);
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if (execvp(pipe_arg_1[0], pipe_arg_1) <= 0)
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{
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printf("%s: Command not found\n", pipe_arg_1[0]);
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exit(0);
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}
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}
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if ((prog_2 = fork()) == 0) /* Child process 1 */
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{
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dup2(fds[0], 0);
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close(fds[0]);
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close(fds[1]);
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if (execvp(pipe_arg_2[0], pipe_arg_2) <= 0)
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{
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printf("%s: Command not found\n", pipe_arg_2[0]);
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exit(0);
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}
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}
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close(fds[0]);
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close(fds[1]);
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waitpid(prog_1, NULL, 0);
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waitpid(prog_2, NULL, 0);
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return 1;
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}
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int do_bg_fg(char **args, int bg)
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{
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pid_t pid;
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if ((pid = fork()) == 0)
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{
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if (execvp(args[0], args) <= 0)
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{
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printf("%s: Command not found\n", args[0]);
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exit(0);
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}
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}
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else
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{
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if (bg)
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{
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signal(SIGCHLD, SIG_IGN);
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}
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else
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{
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waitpid(pid, NULL, 0);
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}
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}
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return 1;
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}
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int execute(char *cmdline, char **args)
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{
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int bg = 0, i = 0, redirect_flag = 0, pipe_num = 0;
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pid_t pid;
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char *redirect_filename = NULL;
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char *redirect_args[ARGS_MAX_QUANTITY];
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char *pipe_arg_1[ARGS_MAX_QUANTITY];
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char *pipe_arg_2[ARGS_MAX_QUANTITY];
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redirect_filename = (char *)calloc(REDIRECT_FILENAME_MAX_SIZE, sizeof(char));
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memset(redirect_args, NULL, sizeof(redirect_args));
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bg = parseline(cmdline, args);
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redirect_flag = check_redirect(args, redirect_filename, redirect_args);
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pipe_num = check_pipe(args, pipe_arg_1, pipe_arg_2);
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if (args[0] == NULL)
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{
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return 1;
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}
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if (pipe_num == 0) /* no pipe */
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{
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if (!built_in(args)) /* built-in cmd? */
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{
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if (redirect_flag != 0) /* redirection? */
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{
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return do_redirect(redirect_flag, redirect_filename, redirect_args);
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}
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else
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{
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return do_bg_fg(args, bg);
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}
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}
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else
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{
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return 1;
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}
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}
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else
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{
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return do_pipe(pipe_arg_1, pipe_arg_2);
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}
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}
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int built_in(char **args)
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{
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if (!strcmp(args[0], "exit"))
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{
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exit(0);
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}
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else if (!strcmp(args[0], "cd"))
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{
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return builtin_cd(args);
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}
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else if (!strcmp(args[0], "history"))
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{
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return builtin_history(args);
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}
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else if (!strcmp(args[0], "mytop"))
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{
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return builtin_mytop();
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}
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else
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{
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return 0;
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}
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}
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int builtin_cd(char **args)
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{
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if (args[1] == NULL)
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{
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return 1;
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}
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else
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{
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if (chdir(args[1]) != 0)
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{
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perror("yeeshell");
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}
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return 1;
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}
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}
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int builtin_history(char **args)
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{
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int n = 0;
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if (args[1] == NULL)
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{
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n = cmdline_amount;
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}
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else
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{
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n = atoi(args[1]) < cmdline_amount ? atoi(args[1]) : cmdline_amount;
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}
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printf("ID\tCommandline\n");
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for (int i = 0; i < n; i++)
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{
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printf("%d\t%s\n", i + 1, history[i]);
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}
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return 1;
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}
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int builtin_mytop()
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{
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int cputimemode = 1;
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mytop_memory();
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getkinfo();
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get_procs();
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if (prev_proc == NULL)
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get_procs();
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print_procs(prev_proc, proc, cputimemode);
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return 1;
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}
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void mytop_memory()
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{
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FILE *fp = NULL;
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int pagesize;
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long total = 0, free = 0, cached = 0;
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if ((fp = fopen("/proc/meminfo", "r")) == NULL)
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{
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exit(0);
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}
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fscanf(fp, "%u %lu %lu %lu", &pagesize, &total, &free, &cached);
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fclose(fp);
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printf("memory(KBytes):\t%ld total\t%ld free\t%ld cached\n", (pagesize * total) / 1024, (pagesize * free) / 1024, (pagesize * cached) / 1024);
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return;
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}
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void get_procs()
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{
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struct proc *p;
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int i;
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p = prev_proc;
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prev_proc = proc;
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proc = p;
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if (proc == NULL)
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{
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proc = malloc(nr_total * sizeof(proc[0]));
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if (proc == NULL)
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{
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fprintf(stderr, "Out of memory!\n");
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exit(1);
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}
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}
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for (i = 0; i < nr_total; i++)
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proc[i].p_flags = 0;
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parse_dir();
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}
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void parse_dir()
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{
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DIR *p_dir;
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struct dirent *p_ent;
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pid_t pid;
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char *end;
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if ((p_dir = opendir("/proc")) == NULL)
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{
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perror("opendir on " _PATH_PROC);
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exit(1);
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}
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for (p_ent = readdir(p_dir); p_ent != NULL; p_ent = readdir(p_dir))
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{
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pid = strtol(p_ent->d_name, &end, 10);
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if (!end[0] && pid != 0)
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{
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parse_file(pid);
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}
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}
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closedir(p_dir);
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}
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void parse_file(pid_t pid)
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{
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char path[PATH_MAX], name[256], type, state;
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int version, endpt, effuid;
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unsigned long cycles_hi, cycles_lo;
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FILE *fp;
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struct proc *p;
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int slot;
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int i;
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sprintf(path, "%d/psinfo", pid);
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if ((fp = fopen(path, "r")) == NULL)
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return;
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if (fscanf(fp, "%d", &version) != 1)
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{
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fclose(fp);
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return;
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}
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if (version != PSINFO_VERSION)
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{
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fputs("procfs version mismatch!\n", stderr);
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exit(1);
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}
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if (fscanf(fp, " %c %d", &type, &endpt) != 2)
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{
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fclose(fp);
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return;
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}
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slot = SLOT_NR(endpt);
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if (slot < 0 || slot >= nr_total)
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{
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//fprintf(stderr, "top: unreasonable endpoint number %d\n", endpt);
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fclose(fp);
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return;
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}
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p = &proc[slot];
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if (type == TYPE_TASK)
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{
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p->p_flags |= IS_TASK;
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}
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else if (type == TYPE_SYSTEM)
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{
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p->p_flags |= IS_SYSTEM;
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}
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p->p_endpoint = endpt;
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p->p_pid = pid;
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if (fscanf(fp, " %255s %c %d %d %lu %*u %lu %lu", name, &state, &p->p_blocked, &p->p_priority, &p->p_user_time, &cycles_hi, &cycles_lo) != 7)
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{
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fclose(fp);
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return;
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}
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strncpy(p->p_name, name, sizeof(p->p_name) - 1);
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p->p_name[sizeof(p->p_name) - 1] = 0;
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if (state != STATE_RUN)
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{
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p->p_flags |= BLOCKED;
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}
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p->p_cpucycles[0] = make64(cycles_lo, cycles_hi);
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p->p_memory = 0L;
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if (!(p->p_flags & IS_TASK))
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{
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int j;
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if ((j = fscanf(fp, " %lu %*u %*u %*c %*d %*u %u %*u %d %*c %*d %*u", &p->p_memory, &effuid, &p->p_nice)) != 3)
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{
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fclose(fp);
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return;
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}
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p->p_effuid = effuid;
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}
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else
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{
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p->p_effuid = 0;
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}
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for (i = 1; i < CPUTIMENAMES; i++)
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{
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if (fscanf(fp, " %lu %lu", &cycles_hi, &cycles_lo) == 2)
|
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{
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p->p_cpucycles[i] = make64(cycles_lo, cycles_hi);
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}
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else
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{
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p->p_cpucycles[i] = 0;
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}
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}
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if ((p->p_flags & IS_TASK))
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{
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if (fscanf(fp, " %lu", &p->p_memory) != 1)
|
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{
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p->p_memory = 0;
|
|
}
|
|
}
|
|
|
|
p->p_flags |= USED;
|
|
|
|
fclose(fp);
|
|
}
|
|
|
|
void getkinfo()
|
|
{
|
|
FILE *fp;
|
|
|
|
if ((fp = fopen("/proc/kinfo", "r")) == NULL)
|
|
{
|
|
fprintf(stderr, "opening " _PATH_PROC "kinfo failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (fscanf(fp, "%u %u", &nr_procs, &nr_tasks) != 2)
|
|
{
|
|
fprintf(stderr, "reading from " _PATH_PROC "kinfo failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
fclose(fp);
|
|
|
|
nr_total = (int)(nr_procs + nr_tasks);
|
|
}
|
|
|
|
void print_procs(struct proc *proc1, struct proc *proc2, int cputimemode)
|
|
{
|
|
int p, nprocs;
|
|
u64_t systemticks = 0;
|
|
u64_t userticks = 0;
|
|
u64_t total_ticks = 0;
|
|
int blockedseen = 0;
|
|
static struct tp *tick_procs = NULL;
|
|
if (tick_procs == NULL)
|
|
{
|
|
tick_procs = malloc(nr_total * sizeof(tick_procs[0]));
|
|
|
|
if (tick_procs == NULL)
|
|
{
|
|
fprintf(stderr, "Out of memory!\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
for (p = nprocs = 0; p < nr_total; p++)
|
|
{
|
|
u64_t uticks;
|
|
if (!(proc2[p].p_flags & USED))
|
|
{
|
|
continue;
|
|
}
|
|
tick_procs[nprocs].p = proc2 + p;
|
|
tick_procs[nprocs].ticks = cputicks(&proc1[p], &proc2[p], cputimemode);
|
|
uticks = cputicks(&proc1[p], &proc2[p], 1);
|
|
total_ticks = total_ticks + uticks;
|
|
if (!(proc2[p].p_flags & IS_TASK))
|
|
{
|
|
if (proc2[p].p_flags & IS_SYSTEM)
|
|
{
|
|
systemticks = systemticks + tick_procs[nprocs].ticks;
|
|
}
|
|
else
|
|
{
|
|
userticks = userticks + tick_procs[nprocs].ticks;
|
|
}
|
|
}
|
|
nprocs++;
|
|
}
|
|
|
|
if (total_ticks == 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
printf("CPU states: %6.2f%% user, ", 100.0 * userticks / total_ticks);
|
|
printf("%6.2f%% system", 100.0 * systemticks / total_ticks);
|
|
printf("%6.2f%% in total\n", 100.0 * (systemticks + userticks) / total_ticks);
|
|
}
|
|
|
|
u64_t cputicks(struct proc *p1, struct proc *p2, int timemode)
|
|
{
|
|
int i;
|
|
u64_t t = 0;
|
|
for (i = 0; i < CPUTIMENAMES; i++)
|
|
{
|
|
if (!CPUTIME(timemode, i))
|
|
{
|
|
continue;
|
|
}
|
|
if (p1->p_endpoint == p2->p_endpoint)
|
|
{
|
|
{
|
|
t = t + p2->p_cpucycles[i] - p1->p_cpucycles[i];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
t = t + p2->p_cpucycles[i];
|
|
}
|
|
}
|
|
|
|
return t;
|
|
}
|
|
|
|
static inline u64_t make64(unsigned long lo, unsigned long hi)
|
|
{
|
|
return ((u64_t)hi << 32) | (u64_t)lo;
|
|
}
|