From 65966ded0cc15c5966c6568cf0ff2f2bbe1fc29a Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Sun, 24 May 2020 12:09:46 +0200
Subject: Big remodelling

---
 02_exercise/process.c | 173 --------------------------------------------------
 1 file changed, 173 deletions(-)
 delete mode 100644 02_exercise/process.c

(limited to '02_exercise/process.c')

diff --git a/02_exercise/process.c b/02_exercise/process.c
deleted file mode 100644
index 093b712..0000000
--- a/02_exercise/process.c
+++ /dev/null
@@ -1,173 +0,0 @@
-#include <wait.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "array.h"
-#include "process.h"
-
-// given a substring of a line tries to parse out as much information as possible
-int parse_command(char const *line, char const *end, Process *p) {
-    char *part;
-    char **local_parts;
-    if (arrayInit(part) != 0 || arrayInit(local_parts) != 0) {
-        fprintf(stderr, "Failed to prepare new part / parts array whilst parsing line");
-        return -1;
-    }
-
-    for (size_t i = 0; line + i < end; ++i) {
-        char c = line[i];
-        if (c == ' ' || c == '\0') {
-            if (arrayLen(part) == 0)
-                continue;
-
-            arrayPush(part) = '\0';
-            arrayPush(local_parts) = part;
-
-            if (c == '\0') {
-                arrayPush(local_parts) = NULL;
-                break;
-            } else {
-                arrayInit(part);
-            }
-        } else {
-            arrayPush(part) = c;
-        }
-    }
-
-    if (arrayLen(part) == 0) {
-        arrayRelease(part);
-    } else {
-        arrayPush(local_parts) = part;
-    }
-
-    arrayPush(local_parts) = NULL;
-    p->argc = arrayLen(local_parts) - 1;
-    p->argv = local_parts;
-
-    return 0;
-}
-
-int parse_line(char const *const line, Process **processes) {
-    // splits the line at | and then parses the commands
-    int ret_code;
-
-    if (arrayInit(*processes) != 0) {
-        perror("Failed to initialize processes array");
-        return -1;
-    }
-
-    bool done = false;
-    char const *cursor = line;
-    while (!done) {
-        Process p = {.in_fd = 0, .out_fd = 0, .pid = 0, .blocking = true};
-        char const *end = strchr(cursor, '|');
-
-        if (end == NULL) {
-            done = true;
-            end = line + strlen(line);
-        }
-
-        if ((ret_code = parse_command(cursor, end, &p)) != 0) {
-            return ret_code;
-        }
-
-        arrayPush(*processes) = p;
-        cursor = end + 1;
-    }
-
-    size_t  p_len = arrayLen(*processes);
-    Process *last = *processes + (p_len - 1);
-
-    // linking up all processes as we currently only have pipes for multiple commands
-    for (size_t i = 0; i < p_len - 1; ++i) {
-        int fds[2];
-        if (pipe(fds) != 0) {
-            perror("Failed to create pipe");
-            return -1;
-        }
-        (*processes)[i].out_fd = fds[1];
-        (*processes)[i + 1].in_fd = fds[0];
-    }
-
-    // setting all processes to non blocking when
-    if (strcmp(last->argv[last->argc - 1], "&") == 0) {
-        arrayPop(last->argv) = NULL;
-        last->argc = last->argc - 1;
-        last->argv[last->argc] = NULL;
-
-        for (size_t i = 0; i < p_len; ++i) {
-            (*processes)[i].blocking = false;
-        }
-    }
-    return ret_code;
-}
-
-int exec_command(Process p) {
-    int status;
-
-    if (!p.blocking) {
-        // if the process is to be put in the background let a fork handle it
-        if (fork() != 0)
-            return 0;
-    }
-
-    if ((p.pid = fork()) == 0) {
-        if (p.in_fd != 0) {
-            dup2(p.in_fd, 0);
-            close(p.in_fd);
-        }
-        if (p.out_fd != 0) {
-            dup2(p.out_fd, 1);
-            close(p.out_fd);
-        }
-        execvp(p.argv[0], p.argv);
-        fprintf(stderr, "could not execute \"%s\"\n", p.argv[0]);
-        fflush(stderr);
-        exit(-1);
-    }
-
-    if (p.pid < 0) {
-        fprintf(stderr, "no fork\n");
-        exit(-2);
-    }
-
-    if (p.in_fd != 0) {
-        close(p.in_fd);
-    }
-
-    if (p.out_fd != 0) {
-        close(p.out_fd);
-    }
-
-    if (!p.blocking)
-        printf("[%i]\n", p.pid);
-
-    if (waitpid(p.pid, &status, 0) < 0) {
-        fprintf(stderr, "wait error'ed out\n");
-    }
-
-    if (!p.blocking) {
-        printf("[%i] TERMINATED\n", p.pid);
-        printf("[%i] EXIT STATUS: %i\n", p.pid, status); // TODO: exit status is wrong
-        exit(0);
-    }
-
-    return WEXITSTATUS(status);
-}
-
-void free_processes(Process **pr) {
-    Process *processes = *pr;
-    while (!arrayIsEmpty(processes)) {
-        Process p = arrayPop(processes);
-        while (!arrayIsEmpty(p.argv)) {
-            char *tmp = arrayPop(p.argv);
-            if (tmp)
-                arrayRelease(tmp);
-        }
-        arrayRelease(p.argv);
-    }
-    arrayRelease(processes);
-    *pr = NULL;
-}
\ No newline at end of file
-- 
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