/* --- execute a shell command --- */
int executeshellcmd(Shellcmd *shellcmd)
{
printshellcmd(shellcmd);
Cmd *cmds;
char **cmd0;
cmds = shellcmd->the_cmds;
cmd0 = cmds->cmd;
if(strcmp(*cmd0,"exit") == 0)
{
return 1;
}
int i = executecmds(cmds, shellcmd->rd_stdin, shellcmd->rd_stdout, shellcmd->background);
if(i == -1)
{
printf("Command not found\n");
}
return 0;
}
/* --- execute a shell command --- */
int executeshellcmd (Shellcmd *shellcmd)
{
printshellcmd(shellcmd);
return 0;
}
/* --- execute a shell command --- */
int executeshellcmd (Shellcmd *shellcmd) {
char *cmd = shellcmd->the_cmds->cmd[0];
Cmd *next = shellcmd->the_cmds->next;
if (next) { //If there is more than one command
char *nextName = next->cmd[0];
if(!next->next) { //If there isn't a third command
int pipefd[2];
pipe(pipefd);
int pid1 = fork();
if(pid1 == 0) {
close(pipefd[1]);
int ret = dup2(pipefd[0], 0);
if(ret < 0) perror("dup2");
if(shellcmd->rd_stdout) {
close(1);
int fid = open(shellcmd->rd_stdout, O_WRONLY | O_CREAT);
int ret = dup(fid);
}
if(shellcmd->rd_stdin) {
close(0);
int fid = open(shellcmd->rd_stdin, O_RDONLY);
int ret = dup(fid);
}
int executionResult = execvp(cmd, shellcmd->the_cmds->cmd);
if(executionResult = -1)
{
printf("Command '%s' not found\n", cmd);
return 0;
}
}
int pid2 = fork();
if(pid2 == 0) {
int ret = dup2(pipefd[1], 1);
if(ret < 0) perror("dup2");
int executionResult = execvp(nextName, next->cmd);
if(executionResult = -1)
{
printf("Command '%s' not found\n", nextName);
return 0;
}
}
close(pipefd[0]);
close(pipefd[1]);
if (shellcmd->background){
//printf("I'm not gonna wait\n");
}
else{
//printf("I will wait!\n");
int status;
waitpid(pid1, &status, 0);
waitpid(pid2, &status, 0);
}
}
else { //We don't handle more than two commands at the same time
printf("Too many pipes\nTry again\n");
return 0;
}
}
else {
int pid = fork();
if(pid == 0) {
if(shellcmd->rd_stdout) {
close(1);
int fid = open(shellcmd->rd_stdout, O_WRONLY | O_CREAT);
int ret = dup(fid);
}
if(shellcmd->rd_stdin) {
close(0);
int fid = open(shellcmd->rd_stdin, O_RDONLY);
int ret = dup(fid);
}
// printf("Execution without piping\n");
int executionResult = execvp(cmd, shellcmd->the_cmds->cmd);
if(executionResult = -1)
{
printf("Command '%s' not found\n", cmd);
return 0;
}
}
if (shellcmd->background){ //True if it's a background process
//printf("I'm not gonna wait\n");
}
else{
//printf("I will wait!\n");
int status;
waitpid(pid, &status, 0);
}
}
printshellcmd(shellcmd);
return 0;
}
