From 5bd4d29baa414e7395c9505d31398e80f5e7a169 Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Wed, 20 Feb 2019 16:12:18 -0500
Subject: [PATCH 1/7] initial commit

---
 ex1/ex1.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/ex1/ex1.c b/ex1/ex1.c
index c4b111641..00ad3c5fe 100644
--- a/ex1/ex1.c
+++ b/ex1/ex1.c
@@ -8,7 +8,9 @@
 
 int main(void)
 {
-    // Your code here
+    int x = 50;
+    int fork = fork();
+    printf("before fork: %i, after fork: %i", x, fork)
 
-    return 0;
+        return 0;
 }

From af42cf8ced66ac14e9e0ee017deb2dc37704079c Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Wed, 20 Feb 2019 17:10:03 -0500
Subject: [PATCH 2/7] updated ex1 code

---
 ex1/a.out | Bin 0 -> 8344 bytes
 ex1/ex1.c |  16 +++++++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 ex1/a.out

diff --git a/ex1/a.out b/ex1/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..fde7737700981427bcc34d8f39172926c66bf2bf
GIT binary patch
literal 8344
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literal 0
HcmV?d00001

diff --git a/ex1/ex1.c b/ex1/ex1.c
index 00ad3c5fe..6ea571d38 100644
--- a/ex1/ex1.c
+++ b/ex1/ex1.c
@@ -8,9 +8,19 @@
 
 int main(void)
 {
+
     int x = 50;
-    int fork = fork();
-    printf("before fork: %i, after fork: %i", x, fork)
+    int pid = fork();
+
+    if (pid == 0)
+    {
+        printf("Child value: %i\n", x);
+    }
+    else
+    {
+
+        printf("Parent value: %i\n", pid);
+    }
 
-        return 0;
+    return 0;
 }

From 1f5c586a92c3825d9aaeb4c4c04d6f1657759844 Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Wed, 20 Feb 2019 17:59:31 -0500
Subject: [PATCH 3/7] added code for ex2

---
 ex2/a.out    | Bin 0 -> 8496 bytes
 ex2/ex2.c    |  22 ++++++++++++++++++----
 ex2/text.txt |   1 +
 3 files changed, 19 insertions(+), 4 deletions(-)
 create mode 100644 ex2/a.out

diff --git a/ex2/a.out b/ex2/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..ff919f22a3b9bf6847ce709b6136382791093373
GIT binary patch
literal 8496
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literal 0
HcmV?d00001

diff --git a/ex2/ex2.c b/ex2/ex2.c
index 4245375b9..41a0b0bbb 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -1,5 +1,5 @@
-// Write a program that opens the text.txt file (with the `fopen()` library call) located in this directory 
-// and then calls `fork()` to create a new process. Can both the child and parent access the file descriptor 
+// Write a program that opens the text.txt file (with the `fopen()` library call) located in this directory
+// and then calls `fork()` to create a new process. Can both the child and parent access the file descriptor
 // returned by `fopen()`? What happens when they are written to the file concurrently?
 
 #include <stdio.h>
@@ -8,7 +8,21 @@
 
 int main(void)
 {
-    // Your code here 
-    
+    FILE *fp;
+
+    fp = fopen("text.txt", "w+");
+
+    fprintf(fp, "%s %s", "Hello", "World");
+    fclose(fp);
+
+    int rc = fork();
+    if (rc == 0)
+    {
+        printf("I am the child, pid: %d\n", (int)getpid());
+    }
+    else
+    {
+        printf("I am the parent, pid: %d, pid of child: %d\n", (int)getpid(), rc);
+    }
     return 0;
 }
diff --git a/ex2/text.txt b/ex2/text.txt
index e69de29bb..5e1c309da 100644
--- a/ex2/text.txt
+++ b/ex2/text.txt
@@ -0,0 +1 @@
+Hello World
\ No newline at end of file

From 4cd19334ea1ad2601b15c9a5deef6908b27959f1 Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Wed, 20 Feb 2019 18:14:55 -0500
Subject: [PATCH 4/7] added code for ex3.c

---
 ex3/a.out | Bin 0 -> 8384 bytes
 ex3/ex3.c |  13 ++++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 ex3/a.out

diff --git a/ex3/a.out b/ex3/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..27306f1374687b2595157b558aef79f6c394b44c
GIT binary patch
literal 8384
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z;W33h@>S3=QAGRh{y#7FjiQIV7SwRqFQvNM{uE(6Ch|Edd>`<gz&TCa=vYx_nxmi7
z9(gioh?N`#|8D?&nPg7;G3h8M;)M(Fpx<!W<2wxcYuALMUHJQ^%O2-#P<PtqUjN?}
zd(0p53D8H-kWjb%4_x-{{~JDW7yH*-_Ba=SR=E0)af92dRN)*O=U(KI_<y2XA3W%9
z$hOL1k8{Qaxxj!PsptY8^v{Iy+C%#|kKq5c_`fXHC+skfoR4!CVUKgmISz`-A)6GQ
zum`<K5~qD3uapMR4jjM^`~+1PL;J|n{9@?VcTI=-kZc*Nqo1?Dew`DfI_#YkYtN|~
vlJ;w4;P^Ykxhdko{>kebu{-S#@n%6~jmtUOwWXXxm$o042Bx4W)NTK7(zI0H

literal 0
HcmV?d00001

diff --git a/ex3/ex3.c b/ex3/ex3.c
index 3a3698c1f..9f2f2e3c0 100644
--- a/ex3/ex3.c
+++ b/ex3/ex3.c
@@ -9,7 +9,18 @@
 
 int main(void)
 {
-    // Your code here
+    // printf("goodbye (pid: %d)\n", (int)getpid());
+    int rc = fork();
 
+    // child process starts executing here
+    if (rc == 0)
+    {
+        printf("Child: hello\n");
+    }
+    else
+    {
+        int wc = waitpid(rc, NULL, 0);
+        printf("Parent: goodbye\n");
+    }
     return 0;
 }

From 9fc8d2f2eab716e4c1e7d3f047822c0ebf476feb Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Wed, 20 Feb 2019 18:57:59 -0500
Subject: [PATCH 5/7] added code for ex4

---
 ex4/a.out | Bin 0 -> 8432 bytes
 ex4/ex4.c |  10 +++++++---
 2 files changed, 7 insertions(+), 3 deletions(-)
 create mode 100644 ex4/a.out

diff --git a/ex4/a.out b/ex4/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..a334a10a239201dc1887224b20a5ac27af004705
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/ex4/ex4.c b/ex4/ex4.c
index 0221ca96e..0a1a65216 100644
--- a/ex4/ex4.c
+++ b/ex4/ex4.c
@@ -1,6 +1,6 @@
 // Write a program that calls `fork()` and then calls some form of `exec()`
-// to run the program `/bin/ls`. Try a few variants of `exec()`, such as 
-// `execl()`, `execle()`, `execv()`, and others. Why do you think there 
+// to run the program `/bin/ls`. Try a few variants of `exec()`, such as
+// `execl()`, `execle()`, `execv()`, and others. Why do you think there
 // are so many variants of the same basic call?
 
 #include <stdio.h>
@@ -10,7 +10,11 @@
 
 int main(void)
 {
-    // Your code here    
+    printf("Hello World (pid: %d)\n", (int)getpid());
+
+    int rc = fork();
+
+    rc = execl("/bin/ls", "ls", NULL);
 
     return 0;
 }

From cdbc069b59766d8865ffa50eda132bcf0917a776 Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Thu, 21 Feb 2019 17:49:03 -0500
Subject: [PATCH 6/7] created pipe and printed out data from parent process

---
 ex5/a.out | Bin 0 -> 8720 bytes
 ex5/ex5.c |  37 +++++++++++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 8 deletions(-)
 create mode 100644 ex5/a.out

diff --git a/ex5/a.out b/ex5/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..d1691d133589ce30570d76047fa5fc376146e555
GIT binary patch
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czKRz9Pi)S)T-IHY$Nu;9WS(P1qIUa#0ceN?ivR!s

literal 0
HcmV?d00001

diff --git a/ex5/ex5.c b/ex5/ex5.c
index cbf3b8e61..7282d583d 100644
--- a/ex5/ex5.c
+++ b/ex5/ex5.c
@@ -1,7 +1,7 @@
 // Write a program that forks a child and creates a shared pipe
-// between the parent and child processes. Have the child write 
-// the three messages to the parent and have the parent print out 
-// the messages. 
+// between the parent and child processes. Have the child write
+// the three messages to the parent and have the parent print out
+// the messages.
 
 #include <stdio.h>
 #include <unistd.h>
@@ -10,13 +10,34 @@
 
 #define MSGSIZE 16
 
-char* msg1 = "hello world #1";
-char* msg2 = "hello world #2";
-char* msg3 = "hello world #3";
+char *msg1 = "hello world #1";
+char *msg2 = "hello world #2";
+char *msg3 = "hello world #3";
 
 int main(void)
 {
-    // Your code here
-    
+    char inbuf[MSGSIZE];
+    int p[2], i;
+
+    if (pipe(p) < 0)
+        exit(1);
+
+    int rc = fork();
+    if (rc == 0)
+    {
+        printf("Child process\n");
+        write(p[1], msg1, MSGSIZE);
+        write(p[1], msg2, MSGSIZE);
+        write(p[1], msg3, MSGSIZE);
+    }
+    else
+    {
+        for (i = 0; i < 3; i++)
+        {
+            read(p[0], inbuf, MSGSIZE);
+            printf("% s\n", inbuf);
+        }
+    }
+
     return 0;
 }

From 08ddaf2c42140f606b7b78ebf2466f2dd1543eb0 Mon Sep 17 00:00:00 2001
From: Riley-Brown <riley@riley.gg>
Date: Thu, 21 Feb 2019 18:56:01 -0500
Subject: [PATCH 7/7] used clock_gettime to return average time in nanoseconds

---
 ex6/a.out | Bin 0 -> 8448 bytes
 ex6/ex6.c |  23 +++++++++++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)
 create mode 100644 ex6/a.out

diff --git a/ex6/a.out b/ex6/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..5999a93ca9bdbddb758ebe08301404d174d26d2d
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/ex6/ex6.c b/ex6/ex6.c
index 17532d65f..532560e88 100644
--- a/ex6/ex6.c
+++ b/ex6/ex6.c
@@ -20,7 +20,26 @@ and `clock_gettime()` should work just fine.
 
 int main()
 {
-    // Your code here
-    
+    const char msg[] = "Hello World!";
+    int time;
+
+    for (int i = 0; i < number_iter; i++)
+    {
+        struct timespec start, end;
+
+        clock_gettime(CLOCK_MONOTONIC, &start); /* mark start time */
+
+        write(STDOUT_FILENO, msg, sizeof(msg) - 1);
+
+        clock_gettime(CLOCK_MONOTONIC, &end); /* mark the end time */
+
+        time += BILLION * (end.tv_sec - start.tv_sec) + end.tv_nsec - start.tv_nsec;
+        ;
+    }
+
+    time /= number_iter;
+
+    printf("average elapsed time = %d nanoseconds\n", time);
+
     return 0;
 }