Graduate

Signed-off-by: Matt Strapp <matt@mattstrapp.net>

1 files changed, 47 insertions, 0 deletions

diff --git a/csci4061/100520_breakout/exercise.c b/csci4061/100520_breakout/exercise.c
new file mode 100644
index 0000000..6d560d5
--- /dev/null
+++ b/csci4061/100520_breakout/exercise.c
@@ -0,0 +1,47 @@
+/*
+* Recitation Section Number: 
+* Breakout Number:
+* Member Name
+* Member Name
+* Member Name
+* Member Name
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#define BUFSIZE 20
+#define PERM 0644
+int main(int argc, char *argv[]) {
+	int infile; char buffer[BUFSIZE];
+	// create/open a file named write.txt
+	infile = open("write.txt", O_CREAT | O_RDWR | O_TRUNC, PERM);
+	// write hello world to write.txtS
+	write(infile, "hello world\n", 12);
+	// spawn a child process and use this child process to reroute stdout to write.txt
+	pid_t pid = fork();
+	if (!pid) {
+		dup2(infile, 1);
+	}
+	// print pid
+	printf("Process %d\n", pid);
+	
+	// use the child process spawned previously to read the contents from write.txt, restore output to stdout
+	// and then prints the contents of write.txt to stdout.
+	if (!pid) {
+		read(infile, buffer, 20);
+		int stdout = open("/dev/tty", O_WRONLY);
+		dup2(1, stdout);
+		printf("%s\n", buffer);
+		return 0;
+	}
+	// print pid
+	printf("%d\n", pid);
+	// close the file write.txt
+	close(infile);
+	return 0;
+}
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