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#include <stdio.h> /* popen, fileno */
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#include <iso646.h> /* and, or, not */
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#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
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WIFEXITED, WEXITSTATUS, wait */
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#include <sys/wait.h> /* wait */
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#include <dirent.h> /* DIR, opendir */
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#include <sys/stat.h> /* stat, struct stat */
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#include <unistd.h> /* stat, struct stat, chdir */
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#include <stdlib.h> /* EXIT_FAILURE */
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#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET, FD_ISSET */
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#include <string.h> /* strlen, strcpy, strcat */
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#include <stdbool.h> /* true */
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#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
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#include <errno.h> /* errno */
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typedef struct process{
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#define BUFFER_SIZE 256
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int main(int argc, char *argv[]){
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char plugindir[] = "plugins.d";
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size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
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process *process_list = NULL;
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dir = opendir(plugindir);
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fprintf(stderr, "Can not open directory\n");
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// All directory entries have been processed
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d_name_len = strlen(dirst->d_name);
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// Ignore dotfiles and backup files
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if (dirst->d_name[0] == '.'
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or dirst->d_name[d_name_len - 1] == '~'){
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char *filename = malloc(d_name_len + plugindir_len + 1);
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strcpy(filename, plugindir);
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strcat(filename, "/");
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strcat(filename, dirst->d_name);
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if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
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// Starting a new process to be watched
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process *new_process = malloc(sizeof(process));
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new_process->pid = fork();
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if(new_process->pid == 0){
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/* this is the child process */
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close(pipefd[0]); /* close unused read end of pipe */
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dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
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/* create a new modified argument list */
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char **new_argv = malloc(sizeof(char *) * argc + 1);
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new_argv[0] = filename;
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for(int i = 1; i < argc; i++){
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new_argv[i] = argv[i];
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new_argv[argc] = NULL;
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if(execv(filename, new_argv) < 0){
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close(pipefd[1]); /* close unused write end of pipe */
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new_process->fd = pipefd[0];
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new_process->buffer = malloc(BUFFER_SIZE);
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if (new_process->buffer == NULL){
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new_process->buffer_size = BUFFER_SIZE;
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new_process->buffer_length = 0;
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FD_SET(new_process->fd, &rfds_orig);
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if (maxfd < new_process->fd){
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maxfd = new_process->fd;
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new_process->next = process_list;
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process_list = new_process;
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if (process_list != NULL){
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fd_set rfds = rfds_orig;
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int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
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if (select_ret == -1){
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for(process *process_itr = process_list; process_itr != NULL;
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process_itr = process_itr->next){
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if(FD_ISSET(process_itr->fd, &rfds)){
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if(process_itr->buffer_length + BUFFER_SIZE
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> process_itr->buffer_size){
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process_itr->buffer = realloc(process_itr->buffer,
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process_itr->buffer_size
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if (process_itr->buffer == NULL){
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process_itr->buffer_size += BUFFER_SIZE;
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ret = read(process_itr->fd, process_itr->buffer
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+ process_itr->buffer_length, BUFFER_SIZE);
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process_itr->buffer_length+=ret;
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/* wait for process exit */
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waitpid(process_itr->pid, &status, 0);
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if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
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write(STDOUT_FILENO, process_itr->buffer,
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process_itr->buffer_length);
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FD_CLR(process_itr->fd, &rfds_orig);
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for(process *process_itr = process_list; process_itr != NULL;
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process_itr = process_itr->next){
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close(process_itr->fd);
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kill(process_itr->pid, SIGTERM);
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free(process_itr->buffer);