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149 строки
2.4 KiB
149 строки
2.4 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <fcntl.h>
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void eval(char *cmdline)
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{
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char *argv[MAXLINE];
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char buf[MAXLINE];
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int isBg;
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pid_t pid;
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strcpy(buf,cmdline);
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isBg = parseline(cmdline,argv);
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if(argv[0] == NULL)
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{
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return;
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}
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if(!builtin_cmd(argv))
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{
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if((pid=fork())==0)
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{
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if(isBg)
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{
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//close(1);
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//close(0);
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int fd = open( "/dev/null", O_RDWR );
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dup2( fd, 0 );
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dup2( fd, 1 );
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}
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if(execvp(argv[0],argv)<0)
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{
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printf("%s:Command not found.\n",argv[0]);
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exit(0);
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}
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exit(0);
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}
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if(!isBg)
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{
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wait(0);
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return;
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}
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else
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{
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signal(SIGCHLD, SIG_IGN);
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return;
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}
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}
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}
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int parseline(const char *cmdline, char **argv)
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{
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static char array[MAXLINE];
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char *buf = array;
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char *delim;
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int argc;
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int bg;
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strcpy(buf, cmdline);
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buf[strlen(buf)-1] = ' ';
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while (*buf && (*buf == ' '))
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buf++;
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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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argv[argc++] = buf;
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*delim = '\0';
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buf = delim + 1;
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while (*buf && (*buf == ' '))
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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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argv[argc] = NULL;
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if (argc == 0)
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return 1;
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if ((bg = (*argv[argc-1] == '&')) != 0)
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{
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argv[--argc] = NULL;
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}
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return bg;
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}
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int builtin_cmd(char **argv)
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{
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if(Is_pipe(argv)==1)
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{
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return 1;
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}
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if(Is_redirect(argv)==1)
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{
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return 1;
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}
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if(!strcmp(argv[0],"quit")||!strcmp(argv[0],"exit"))
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{
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exit(0);
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}
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if(!strcmp(argv[0],"history"))
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{
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print_history(argv[1]);
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return 1;
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}
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if(!strcmp(argv[0],"cd"))
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{
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if (argv[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(argv[1]) != 0)
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{
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perror("Error: ");
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}
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return 1;
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}
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}
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if(!strcmp(argv[0],"mytop"))
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{
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mytop();
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return 1;
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}
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return 0;
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}
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