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authorMatthew Strapp <msattr@gmail.com>2020-10-19 07:55:41 -0500
committerMatthew Strapp <msattr@gmail.com>2020-10-19 07:55:41 -0500
commit89ba57eb2b9e024996da29ba5e429adf15b27a6d (patch)
tree2edbdec54f9316c0110cab2aeaa599ce1dc14dee
parentadd new breakout (diff)
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add breakouts
-rw-r--r--.vscode/tasks.json2
-rw-r--r--csci4061/101220_breakout/exercise.c22
-rw-r--r--csci4061/101920_breakout/pipe_template.c72
3 files changed, 91 insertions, 5 deletions
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 9792107..6af30e3 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -6,7 +6,7 @@
{
"label": "Build c++",
"type": "shell",
- "command": "g++",
+ "command": "gcc",
"args": [
"-g",
"-Wall",
diff --git a/csci4061/101220_breakout/exercise.c b/csci4061/101220_breakout/exercise.c
index 5021142..be8bb11 100644
--- a/csci4061/101220_breakout/exercise.c
+++ b/csci4061/101220_breakout/exercise.c
@@ -9,9 +9,10 @@
#include <string.h>
int numOfEntries(char* path) {
- /*
- Count the number of entries in path
- */
+ int entries = 0;
+ while (readdir(path) != NULL) {
+ entries++;
+ } return entries;
}
int main(int argc, char** argv){
@@ -27,7 +28,20 @@ int main(int argc, char** argv){
return -1;
}
struct dirent* entry;
-
+ DIR* current = dir;
+
+while ((entry = readdir(dir)) != NULL) {
+ if (entry->d_type == "DT_DIR"){
+ printf("Directory: %s\n", entry->d_name);
+ printf(" Entries: %d\n", numOfEntries(entry));
+ } else if (entry->d_type == "DT_REG") {
+ printf("Regular File: %s\n", entry->d_name);
+ printf(" Owner: %d\n");
+ printf(" Size: %f\n");
+ } else {
+ printf("%s\n", entry -> d_name);
+ }
+ }
/*
Iterate through the elements in argv[1]
Refer the ls example in slides if you have any doubts
diff --git a/csci4061/101920_breakout/pipe_template.c b/csci4061/101920_breakout/pipe_template.c
new file mode 100644
index 0000000..bb59d8d
--- /dev/null
+++ b/csci4061/101920_breakout/pipe_template.c
@@ -0,0 +1,72 @@
+// -----------------------------------------------------------------------------
+// Pipes
+//
+// Write a program that creates a child process and pipes the string
+// "hello child" to the child to be printed. The parent should wait for the
+// child to terminate
+//
+// Template: Implement the TODOs
+//
+// Expected output:
+// Parent Sending: hello child
+// Child Received: hello child
+// -----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+int main(void) {
+ // Open pipe
+ // TODO
+ int ends[2];
+ pipe(ends);
+
+ char string_to_send[] = "hello child";
+ int bytes_to_send_recv = strlen(string_to_send) + 1;
+
+ // Create child process
+ pid_t pid = fork();
+ if (pid < 0) {
+ // Error
+ fprintf(stderr, "ERROR: Failed to fork\n");
+ }
+ else if (pid > 0) {
+ // Parent
+ printf("Parent Sending: %s\n", string_to_send);
+
+ // Parent doesn't need read file descriptor
+ // TODO
+ close(ends[0]);
+ // Write the string to the pipe
+ // TODO
+ write(ends[1], string_to_send, bytes_to_send_recv);
+ // Done writing
+ // TODO
+ close(ends[1]);
+ // Wait for child to terminate
+ wait(NULL);
+ }
+ else {
+ // Child
+
+ char *recv_buffer = malloc(bytes_to_send_recv);
+
+ // Child doesn't need write file descriptor
+ // TODO
+ close(ends[1]);
+ // Read the string from the pipe
+ // TODO
+ read(ends[0], recv_buffer, bytes_to_send_recv);
+ // Done reading
+ // TODO
+ close(ends[0]);
+ // Print result
+ printf("Child Received: %s\n", recv_buffer);
+ free(recv_buffer);
+ }
+
+ return 0;
+}