/*执行命令*/
void execSimpleCmd(SimpleCmd *cmd){
int i, pid;
char *temp;
Job *now = NULL;
char *match_out;
if(strcmp(cmd->args[0], "exit") == 0) { //exit命令
exit(0);
} else if (strcmp(cmd->args[0], "history") == 0) { //history命令
if(history.end == -1){
printf("尚未执行任何命令\n");
return;
}
i = history.start;
do {
printf("%s\n", history.cmds[i]);
i = (i + 1)%HISTORY_LEN;
} while(i != (history.end + 1)%HISTORY_LEN);
}else if(strcmp(cmd->args[0], "enable") == 0){//enable command
enable_exec();
} else if(strcmp(cmd->args[0], "type") == 0){//type command
type_exec(cmd);
} else if(strcmp(cmd->args[0], "echo") == 0){//echo command
echo_exec(cmd);
}
else if (strcmp(cmd->args[0], "jobs") == 0) { //jobs命令
if(head == NULL){
printf("尚无任何作业\n");
} else {
printf("index\tpid\tstate\t\tcommand\n");
for(i = 1, now = head; now != NULL; now = now->next, i++){
printf("%d\t%d\t%s\t\t%s\n", i, now->pid, now->state, now->cmd);
}
}
} else if (strcmp(cmd->args[0], "cd") == 0) { //cd命令
temp = cmd->args[1];
if(temp != NULL){
if(chdir(temp) < 0){
if (match(temp,&match_out)){
chdir(match_out);
free(match_out);
}
else
printf("cd; %s 错误的文件名或文件夹名！\n", temp);
}
}
} else if (strcmp(cmd->args[0], "fg") == 0) { //fg命令
temp = cmd->args[1];
if(temp != NULL && temp[0] == '%'){
pid = str2Pid(temp, 1, strlen(temp));
if(pid != -1){
fg_exec(pid);
}
}else{
printf("fg; 参数不合法，正确格式为：fg %%<int>\n");
}
} else if (strcmp(cmd->args[0], "bg") == 0) { //bg命令
temp = cmd->args[1];
if(temp != NULL && temp[0] == '%'){
pid = str2Pid(temp, 1, strlen(temp));
if(pid != -1){
bg_exec(pid);
}
}
else{
printf("bg; 参数不合法，正确格式为：bg %%<int>\n");
}
} else{ //外部命令
execOuterCmd(cmd);
}
//释放结构体空间
for(i = 0; cmd->args[i] != NULL; i++){
free(cmd->args[i]);
free(cmd->input);
free(cmd->output);
}
}
/* execution for commands */
static void
execute_command(char cmd[MAX_CMD][MAX_CMD_LEN], pid_t wpid[MAX_CMD],
int cmd_num)
{
/* e.g. "ls", "-l" */
char buf[MAX_ARGC][MAX_ARG_LEN];
/* two pipes needed */
int fds[2][2];
int n;
int fd;
pid_t pid;
/* 0: pipe1, 1: pipe2 */
int pipe_flag;
COMMAND command;
n = 0;
pipe_flag = 0;
while (n < cmd_num) {
command_init(&command);
argument_parser(cmd[n], buf, &command);
if (!pipe_flag) { /* pipe1 */
/* last command doesn't need to create a pipe */
if(n != cmd_num - 1) {
if (pipe(fds[0]) == -1) {
fprintf(stderr, "%s: pipe() error: "
"%s\n", command.arg[0],
strerror(errno));
/* close read end of previous pipe */
if (n != 0)
close(fds[1][0]);
while (n < cmd_num) {
wpid[n] = -1;
n++;
}
break;
}
}
if ((pid = fork()) == -1){
fprintf(stderr, "%s: fork() error: %s\n",
command.arg[0], strerror(errno));
close(fds[0][0]);
close(fds[0][1]);
/* close read end of previous pipe */
if (n != 0)
close(fds[1][0]);
while (n < cmd_num) {
wpid[n] = -1;
n++;
}
break;
} else if (pid == 0) { /* child */
/*
* Close read end in child process.
* Last command doesn't create a pipe.
*/
if(n != cmd_num - 1)
close(fds[0][0]);
/* stdin redirection */
if(strcmp(command.input, "") != 0) {
if ((fd = open(command.input, O_RDONLY))
== -1) {
fprintf(stderr, "%s: %s: open"
"() error: %s\n",
command.arg[0],
command.input,
strerror(errno));
exit(DEFAULT_STATUS);
}
if (dup2(fd, STDIN_FILENO) == -1) {
fprintf(stderr, "%s: %s: dup2()"
"error: %s\n",
command.arg[0],
command.input,
strerror(errno));
close(fd);
exit(DEFAULT_STATUS);
}
close(fd);
} else if(n != 0){
if (dup2(fds[1][0], STDIN_FILENO) ==
-1) {
fprintf(stderr, "%s: dup2()"
"error: %s\n",
command.arg[0],
strerror(errno));
close(fds[1][0]);
exit(DEFAULT_STATUS);
}
}
/* close read end of previous pipe */
if(n != 0)
close(fds[1][0]);
/* stdout redirection */
if(strcmp(command.output,"")!=0) {
if(command.append)
fd = open(command.output,
O_WRONLY | O_APPEND
| O_CREAT, S_IWUSR |
S_IRUSR);
else
fd = open(command.output,
O_WRONLY | O_TRUNC
| O_CREAT, S_IWUSR |
S_IRUSR);
if (fd == -1) {
fprintf(stderr, "%s: %s: open"
"() error: %s\n",
command.arg[0],
command.output,
strerror(errno));
exit(DEFAULT_STATUS);
}
if (dup2(fd, STDOUT_FILENO) == -1) {
fprintf(stderr, "%s: %s: dup2()"
"error: %s\n",
command.arg[0],
command.output,
strerror(errno));
close(fd);
exit(DEFAULT_STATUS);
}
close(fd);
} else if (n != cmd_num - 1){
if (dup2(fds[0][1], STDOUT_FILENO) ==
-1) {
fprintf(stderr, "%s: dup2()"
"error: %s\n",
command.arg[0],
strerror(errno));
close(fds[0][1]);
exit(DEFAULT_STATUS);
}
}
if(n != cmd_num - 1)
close(fds[0][1]);
/* builtin commands */
if (strcmp(command.arg[0], "exit") == 0) {
if (exit_syntax_check(command.arg) ==
-1) {
exit_usage();
exit(EXIT_FAILURE);
} else
exit(ret_val);
} else if (strcmp(command.arg[0], "cd") == 0) {
if (cd_syntax_check(command.arg) ==
-1) {
cd_usage();
exit(EXIT_FAILURE);
} else {
exit(cd_exec(command.arg));
}
} else if (strcmp(command.arg[0], "echo") ==
0) {
echo_exec(command.arg);
exit(EXIT_SUCCESS);
}
execvp(command.arg[0], command.arg);
fprintf(stderr, "%s: command not found\n",
command.arg[0]);
exit(DEFAULT_STATUS);
} else { /* parent */
wpid[n] = pid;
if(n != cmd_num - 1)
close(fds[0][1]);
if(n != 0)
close(fds[1][0]);
}
pipe_flag = 1;
} else { /* pipe2 */
/* last command doesn't need to create a pipe */
if(n != cmd_num - 1) {
if (pipe(fds[1]) == -1) {
fprintf(stderr, "%s: pipe() error: "
"%s\n", command.arg[0],
strerror(errno));
/* close read end of previous pipe */
if (n != 0)
close(fds[0][0]);
while (n < cmd_num) {
wpid[n] = -1;
n++;
}
break;
}
}
if ((pid = fork()) == -1){
fprintf(stderr, "%s: fork() error: %s\n",
command.arg[0], strerror(errno));
close(fds[1][0]);
close(fds[1][1]);
/* close read end of previous pipe */
if (n != 0)
close(fds[0][0]);
while (n < cmd_num) {
wpid[n] = -1;
n++;
}
break;
} else if (pid == 0) { /* child */
/*
* Close read end in child process.
* Last command doesn't create a pipe.
*/
if(n != cmd_num - 1)
close(fds[1][0]);
/* stdin redirection */
if(strcmp(command.input, "") != 0) {
if ((fd = open(command.input, O_RDONLY))
== -1) {
fprintf(stderr, "%s: %s: open"
"() error: %s\n",
command.arg[0],
command.input,
strerror(errno));
exit(DEFAULT_STATUS);
}
if (dup2(fd, STDIN_FILENO) == -1) {
fprintf(stderr, "%s: %s: dup2()"
"error: %s\n",
command.arg[0],
command.input,
strerror(errno));
close(fd);
exit(DEFAULT_STATUS);
}
close(fd);
} else if(n != 0){
if (dup2(fds[0][0], STDIN_FILENO) ==
-1) {
fprintf(stderr, "%s: dup2()"
"error: %s\n",
command.arg[0],
strerror(errno));
close(fds[0][0]);
exit(DEFAULT_STATUS);
}
}
/* close read end of previous pipe */
if(n != 0)
close(fds[0][0]);
/* stdout redirection */
if(strcmp(command.output,"")!=0) {
if(command.append)
fd = open(command.output,
O_WRONLY | O_APPEND
| O_CREAT, S_IWUSR |
S_IRUSR);
else
fd = open(command.output,
O_WRONLY | O_TRUNC
| O_CREAT, S_IWUSR |
S_IRUSR);
if (fd == -1) {
fprintf(stderr, "%s: %s: open"
"() error: %s\n",
command.arg[0],
command.output,
strerror(errno));
exit(DEFAULT_STATUS);
}
if (dup2(fd, STDOUT_FILENO) == -1) {
fprintf(stderr, "%s: %s: dup2()"
"error: %s\n",
command.arg[0],
command.output,
strerror(errno));
close(fd);
exit(DEFAULT_STATUS);
}
close(fd);
} else if (n != cmd_num - 1){
if (dup2(fds[1][1], STDOUT_FILENO) ==
-1) {
fprintf(stderr, "%s: dup2()"
"error: %s\n",
command.arg[0],
strerror(errno));
close(fds[1][1]);
exit(DEFAULT_STATUS);
}
}
if(n != cmd_num - 1)
close(fds[1][1]);
/* builtin commands */
if (strcmp(command.arg[0], "exit") == 0) {
if (exit_syntax_check(command.arg) ==
-1) {
exit_usage();
exit(EXIT_FAILURE);
} else
exit(ret_val);
} else if (strcmp(command.arg[0], "cd") == 0) {
if (cd_syntax_check(command.arg) ==
-1) {
cd_usage();
exit(EXIT_FAILURE);
} else {
exit(cd_exec(command.arg));
}
} else if (strcmp(command.arg[0], "echo") ==
0) {
echo_exec(command.arg);
exit(EXIT_SUCCESS);
}
execvp(command.arg[0], command.arg);
fprintf(stderr, "%s: command not found\n",
command.arg[0]);
exit(DEFAULT_STATUS);
} else { /* parent */
wpid[n] = pid;
if(n != cmd_num - 1)
close(fds[1][1]);
if(n != 0)
close(fds[0][0]);
}
pipe_flag = 0;
}
n++;
}
}
