From ef929aa3b508f311e0b9ad3bd043f935b77df80a Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:05:19 -0500
Subject: [PATCH 01/24] initial commit

---
 ex1/ex1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ex1/ex1.c b/ex1/ex1.c
index c4b111641..af67a54fa 100644
--- a/ex1/ex1.c
+++ b/ex1/ex1.c
@@ -9,6 +9,6 @@
 int main(void)
 {
     // Your code here
-
+    // initial commit
     return 0;
 }

From f5fbc886c8247a2533acca94ba854794a54418f0 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:16:09 -0500
Subject: [PATCH 02/24] ex1 code and questions complete

---
 ex1/ex1.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/ex1/ex1.c b/ex1/ex1.c
index af67a54fa..ed548f630 100644
--- a/ex1/ex1.c
+++ b/ex1/ex1.c
@@ -9,6 +9,19 @@
 int main(void)
 {
     // Your code here
-    // initial commit
+    int x = 100;
+    int pid = fork();
+
+    if(pid == 0) {
+        printf("Hello, I'm a child process!\n");
+    }
+    else {
+        printf("Hello, I'm a parent process!\n");
+    }
+    printf("%d %d", 100, x);
+
     return 0;
 }
+
+/* After initialization, the variable in the child process would be the same as its value in the parent process. When the parent and child change the value of x, we can access both values of x within their respective forks.
+If we were to do something like (x * 2) in the parent fork and (x / 2) in the child fork, we could work with both 200 and 50. */

From 725e928759a8faf29762b267dfd0e6d8278a166b Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:21:58 -0500
Subject: [PATCH 03/24] initial code idea for ex2 added, figuring out a good
 way to test this to help with answering questions

---
 ex2/ex2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ex2/ex2.c b/ex2/ex2.c
index 4245375b9..3685daa47 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -9,6 +9,10 @@
 int main(void)
 {
     // Your code here 
+    FILE * file_pointer;
+
+    file_pointer = fopen("text.txt", "r");
+    int pid = fork();
     
     return 0;
 }

From 5bdb851230a9b2c3480d97d4784d44c1104fafe3 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:38:21 -0500
Subject: [PATCH 04/24] added parent/child cases for ex2

---
 ex2/ex2.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/ex2/ex2.c b/ex2/ex2.c
index 3685daa47..46c3f19c4 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -13,6 +13,15 @@ int main(void)
 
     file_pointer = fopen("text.txt", "r");
     int pid = fork();
+
+    if(pid == 0) {
+        fprintf(fp, "%s %s", "Child", "text.");
+        fclose(fp);
+    }
+    else {
+        fprintf(fp, "%s %s", "Parent", "test.");
+        fclose(fp);
+    }
     
     return 0;
 }

From 738754e454251b7d0d7e5aa96a267d674e9b476b Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:38:58 -0500
Subject: [PATCH 05/24] forgot to add write capability (r -> r+)

---
 ex2/ex2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ex2/ex2.c b/ex2/ex2.c
index 46c3f19c4..4a91276a6 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -11,7 +11,7 @@ int main(void)
     // Your code here 
     FILE * file_pointer;
 
-    file_pointer = fopen("text.txt", "r");
+    file_pointer = fopen("text.txt", "r+");
     int pid = fork();
 
     if(pid == 0) {
@@ -22,6 +22,6 @@ int main(void)
         fprintf(fp, "%s %s", "Parent", "test.");
         fclose(fp);
     }
-    
+
     return 0;
 }

From c7f0af56db3f6b13603ef5c24c16d3dfcca72086 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:46:26 -0500
Subject: [PATCH 06/24] fixed variable name error (fp - file_pointer, forgot to
 change after referencing example code)

---
 ex2/ex2   | Bin 0 -> 8760 bytes
 ex2/ex2.c |  10 +++++-----
 2 files changed, 5 insertions(+), 5 deletions(-)
 create mode 100644 ex2/ex2

diff --git a/ex2/ex2 b/ex2/ex2
new file mode 100644
index 0000000000000000000000000000000000000000..a5eb56ae5105c1f9507155a454af549aceb48908
GIT binary patch
literal 8760
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zmg>*tbNu1EPy3r_OGCx>9B1+W-28tw&u=cD=fMSA`TRfQ5;Y2m^-XD6X8e83u+~2p
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K&9=&<VE+NZkcQX*

literal 0
HcmV?d00001

diff --git a/ex2/ex2.c b/ex2/ex2.c
index 4a91276a6..06e725331 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -9,18 +9,18 @@
 int main(void)
 {
     // Your code here 
-    FILE * file_pointer;
+    FILE *file_pointer;
 
     file_pointer = fopen("text.txt", "r+");
     int pid = fork();
 
     if(pid == 0) {
-        fprintf(fp, "%s %s", "Child", "text.");
-        fclose(fp);
+        fprintf(file_pointer, "%s %s", "Child", "text.");
+        fclose(file_pointer);
     }
     else {
-        fprintf(fp, "%s %s", "Parent", "test.");
-        fclose(fp);
+        fprintf(file_pointer, "%s %s", "Parent", "text.");
+        fclose(file_pointer);
     }
 
     return 0;

From 3a16af91db1c1872fe72640421e150daa483dfc8 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 15:53:40 -0500
Subject: [PATCH 07/24] completed ex2 with questions and text example appearing
 properly in the file

---
 ex2/ex2      | Bin 8760 -> 8760 bytes
 ex2/ex2.c    |   6 ++++--
 ex2/text.txt |   1 +
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/ex2/ex2 b/ex2/ex2
index a5eb56ae5105c1f9507155a454af549aceb48908..111925dd5849d0f5d20fd0756d62959e30df0b0c 100644
GIT binary patch
delta 99
zcmdntvcqLV3zNv#!nSvfQN3I9RSFwdAB(#<WA>?|n`bahWM&g*cVO5jJ6WGinOhmi
z+@%TO$Fl8^;$m>l$jnJ$P%TzaEoLZ5ttioB2uLhS%`4fg&z>pHXs~&v+<ayLl*A&h

delta 99
zcmdntvcqLV3zNva$mlGNpJz6HT|SE^zIyfFXM5wHZ=S(4k(o`5-GO1B%w&BwWo{)P
zbC(8$AIr8wiorP}Gbe>XwOB#5n4u)KxI~X3Ah9SluY_T<K6|D(qyFZZa`Tx1l>H*3

diff --git a/ex2/ex2.c b/ex2/ex2.c
index 06e725331..acf77a641 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -9,13 +9,13 @@
 int main(void)
 {
     // Your code here 
-    FILE *file_pointer;
+    FILE * file_pointer;
 
     file_pointer = fopen("text.txt", "r+");
     int pid = fork();
 
     if(pid == 0) {
-        fprintf(file_pointer, "%s %s", "Child", "text.");
+        fprintf(file_pointer, "%s %s", "Child", "text.\n");
         fclose(file_pointer);
     }
     else {
@@ -25,3 +25,5 @@ int main(void)
 
     return 0;
 }
+
+/* Yes, both child and parent can access the file returned by fopen(). In the case of concurrent attempts, they are saved together as in the example above. */
\ No newline at end of file
diff --git a/ex2/text.txt b/ex2/text.txt
index e69de29bb..417ad503a 100644
--- a/ex2/text.txt
+++ b/ex2/text.txt
@@ -0,0 +1 @@
+Parent text.Child text.

From bd40bbfd9681b5cf984524048e7972f944e9ed7d Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 16:36:34 -0500
Subject: [PATCH 08/24] ex3 complete, child/parent printing is working properly

---
 ex3/ex3   | Bin 0 -> 8704 bytes
 ex3/ex3.c |   9 +++++++++
 2 files changed, 9 insertions(+)
 create mode 100644 ex3/ex3

diff --git a/ex3/ex3 b/ex3/ex3
new file mode 100644
index 0000000000000000000000000000000000000000..3bd9a6ccc4df30ce7a1d7017bda46c909b5d1f8d
GIT binary patch
literal 8704
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rA&Rzn?O63DW&Gpv!F?Pnx8cS8p?4V(t<OsB&)+MmVW-2nv;BVqk4sQQ

literal 0
HcmV?d00001

diff --git a/ex3/ex3.c b/ex3/ex3.c
index 3a3698c1f..2ceacd87c 100644
--- a/ex3/ex3.c
+++ b/ex3/ex3.c
@@ -10,6 +10,15 @@
 int main(void)
 {
     // Your code here
+    int pid = fork();
+    waitpid(pid, NULL, 0); /* if I'm understanding this right, the wait(NULL) here ensures the child is printed first */
 
+    if(pid == 0) {
+        printf("%s", "hello\n");
+    }
+    else {
+        printf("%s", "goodbye\n");
+    }
+    
     return 0;
 }

From 76c37f9db2a57c18c63fd584cdb62da68a9f8a47 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 17:06:13 -0500
Subject: [PATCH 09/24] ex4 complete, today's MVP met. Going to keep looking at
 the ex3 syntax changes to learn more about process ordering and the different
 versions of exec() from ex4.

---
 ex3/ex3   | Bin 8704 -> 8752 bytes
 ex3/ex3.c |   7 ++++---
 ex4/ex4   | Bin 0 -> 8600 bytes
 ex4/ex4.c |  13 +++++++++++++
 4 files changed, 17 insertions(+), 3 deletions(-)
 create mode 100644 ex4/ex4

diff --git a/ex3/ex3 b/ex3/ex3
index 3bd9a6ccc4df30ce7a1d7017bda46c909b5d1f8d..6b768dbefb42851c34d32896f72b44f0d13e412a 100644
GIT binary patch
delta 1546
zcmZ8hTWlLu5WROder(#<UOV=B^YEh(g(B5%B7#dL$hrw)4Uyuu38hFOc1t5dc%+a*
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t7lhXphzRWcGl|3X06SDU*iBEu@nE;`o<j?eG%N%of>+YfGf)ot{{>{kkEZ|t

delta 1476
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zn#PG)d4mX1zF~@z+WQ#!=aj=YO33Of&J-DELktDWJhHRw{kfi1o{G<*Ppor8eGi?_
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b5M%=*TG}a=LEeIDAgn#=YM{fQ5BUB8ErxA{

diff --git a/ex3/ex3.c b/ex3/ex3.c
index 2ceacd87c..d469a2370 100644
--- a/ex3/ex3.c
+++ b/ex3/ex3.c
@@ -10,15 +10,16 @@
 int main(void)
 {
     // Your code here
-    int pid = fork();
-    waitpid(pid, NULL, 0); /* if I'm understanding this right, the wait(NULL) here ensures the child is printed first */
+    pid_t pid = fork();
 
     if(pid == 0) {
         printf("%s", "hello\n");
+        wait(NULL);
     }
     else {
         printf("%s", "goodbye\n");
+        waitpid(pid, NULL, 1);
     }
-    
+
     return 0;
 }
diff --git a/ex4/ex4 b/ex4/ex4
new file mode 100644
index 0000000000000000000000000000000000000000..513f4ff3e0ad4f6f9bc196064c114eb63dee353a
GIT binary patch
literal 8600
zcmeHNeQaA-6+gD~)i1}*+AeJ;`UEXxgS<K=4Jp&s=X^9TmD{eV(+NTP;>1p3=Gc|}
zT+(WSj%<~z(NPJ6@(&UcOal#xAq^CSw6<z#JN{~s1{0qJu_@iUk+D(b4_0%|edpMI
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z{V(;)x?lT<{5O$Hb65DXzmf0A*LnP9eoOr_59U1e%Xh*hY7{21ceIKw_&>0qI{xy0
zi7RLmB1_?kT=MW`-P*={iBsGNPxQN(AxzpY>%eX%dhNM8gbo1&2n&}HCnJ3Ik+rH!
z_#)S1nbcin2EXPP6nz7$P99a&Epxxx?l{M9^1yuz3wPor?P2%${}Hw8pWozoYw<Yu
G*8d;%Y6l1a

literal 0
HcmV?d00001

diff --git a/ex4/ex4.c b/ex4/ex4.c
index 0221ca96e..7cbf93c16 100644
--- a/ex4/ex4.c
+++ b/ex4/ex4.c
@@ -11,6 +11,19 @@
 int main(void)
 {
     // Your code here    
+    pid_t pid = fork();
 
+    char *bin_ref = {"./bin/ls", NULL}; /* might try running another file from this project at some point too */
+    exec(bin_ref[0], bin_ref);
+    // execl(bin_ref[0], bin_ref);
+    // execle(bin_ref[0], bin_ref);
+    // execvp(bin_ref[0], bin_ref);
     return 0;
 }
+
+/* The different versions seem to mainly reference parameters.
+For example, -l includes individual parameters in the call, whereas -v is useful when
+variables are not known in advance because it allows you to pass in a char* array
+rather than a specific number of parameters. There is some additional functionality 
+with things like -e and -p and I'd be lying if I said I understand this fully yet, so
+I'm going to keep looking into these differences. */

From 6540ddd690d1759ca945d6c3cc815eab0498a8e5 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 17:21:09 -0500
Subject: [PATCH 10/24] reviewing some ex3 changes to learn more about the
 effects of waitpid()

---
 ex3/ex3.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ex3/ex3.c b/ex3/ex3.c
index d469a2370..fc2b22ff9 100644
--- a/ex3/ex3.c
+++ b/ex3/ex3.c
@@ -11,15 +11,19 @@ int main(void)
 {
     // Your code here
     pid_t pid = fork();
+    waitpid(pid, NULL, 0);
 
     if(pid == 0) {
         printf("%s", "hello\n");
-        wait(NULL);
+        // waitpid(pid, NULL, 0);
     }
     else {
         printf("%s", "goodbye\n");
-        waitpid(pid, NULL, 1);
+        // waitpid(pid, NULL, 0);
+        
     }
 
     return 0;
 }
+
+/* currently testing out the results of implementing waitpid() in various spots in the code */
\ No newline at end of file

From 8d26bd0ae9e66f364778b902e5bae812f93b9d8e Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 17:36:01 -0500
Subject: [PATCH 11/24] found the issue: I had the waitpid() after the printf()
 statement initially, child process now always prints first and waitpid() is
 in the proper location

---
 ex3/ex3   | Bin 8752 -> 8704 bytes
 ex3/ex3.c |   7 +++----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/ex3/ex3 b/ex3/ex3
index 6b768dbefb42851c34d32896f72b44f0d13e412a..8b12e293d7d9bf5a0038079367e471dbcdde24e5 100644
GIT binary patch
delta 1471
zcmZ8hUuc_E6u<ZTnm=FvB>9@AY1TG>Dxp+dzwJSi39iZP+|4K~VeQ00Z9pmdFlnI{
z8A3C<b!21G<P;tAC2CRjBALNi$7oY3O9MVMsL<(48LnjLWDg<}T;sVnH!3?1=X}5O
z|D1d8mmf|IFLvq0rU>Cw=O{A+pEuvO2pzd?$^0~^g_SyrfKD&!OXfOSGS@?v;5z-e
z!?`^A@~bCK-}`8H(z|>5huw#vt2g1Q5{3h67wv_L;-&^r)eTJTf-R*Bl4=V~sZo<c
zFgtvs`siV}tIo}_`QNPUvgxZ9KVcV&Gp6e6SdPtqYu%`qZSdOjpP)-ExQyKHi{KZ>
zZ*ud4of=Z`8po95ErGKf^HClY1-`_w%5h%cBZw#G7EvMS;KNwD@)}FuWAnc}ijT%h
z#VMSamDY(6rJJS*seXu&e@xna!-TAya3skX+s{z2`NuYvzCYW&!c*}%^zk)rsO_Nh
zd69p7gSS07*ubmYKGwv}{m$U5DcE0kxBJNWM!i7l#Y(fEkazSkOkI5&E05nXt->AC
z(KlMx&SO*6YkRfYuinc?|Gvd5ta6qvRhLn_c8S~1;+N>CjI~MhmFTHxx)vRaj*eUj
z?pgfU{gwS(o{XjcjHQ1Z8MrS_WBrL*wd}#1d0PMONv-xCrhN`GjiBrUY6;P8IAk$Q
z3~g~ZV|m6oi`HYjder7vP+n>?D@O{STF#ikVU25xxHnEy;IZ}VVR`-9gpQCINZ2MQ
zgBvy<Jq{Jy5KV$^_vzbeM0m)HNs17)8#D*gb|1|`#(vQ=D>E%f`GJ(5!42IBJG2Sn
zjxEd_(A^jj&|RvP<RF2lC{Q!mhI5F*=<iZnNfM=-<^{50J+8H5e|o!1b&wQFH(e5_
zoosRmr`od^T|xUk!hkv_1|G>C<Zz@LKNMmk2jmVK`azg>x*_MZVt?1223>@^&Ix73
z0xxvDk44HI2AzVxkcVNwWqA12_&){lmbVk$+_a1Pe2hE-6_?wS!ei&uBsd{o3r`!q
zINIq>#GlG@L0TLCglA<`3H1(wLp|mHz4Yf#fzvT~t8<8t(An=<7q%ACIAGy`tiM3r
zhm}IYGeHYq?CYaAYo*)JnHmuuj6X=E<DmB#dRA()QrilN9z)AXZ4S~sA+0D;5z0NG
zfA7h*jKJH|YiNxo!Vv2X=}CDiNx79cWY8xswRtF`Ph$l|>GLJ%UPGIa>zsj@H`LZx
zZpw@e<1fw$Ij>*)@4r~~hMG5J#HP8>>|3CCI2k|oBNrKlvOlCX*2+K&@b$%zAB1#Z
XNJ}}yGRV77352xAopp2w^giD|-kE9#

delta 1546
zcmZ8hU2Gdg5Z=9ue=coopB?*r`SDL73Pq~jL==}ukaLrYGenBpCX^zDI4z9`<tK#z
zeV|IJ&;(NzIT{J!H}X=-uUth!Ef0x9q6FR?36Pq;*vJJ(P)H?I<$+>m?=~%BPMX<o
zW_D(GX7(n!bKM!gOe`8<WO71AXLf&5yVGvy$WHsrdPLF$6X_t+X}N4QQQ2y4DZ{7q
zM*U}}cCB3h{6kyCeJzxjf8pdtpE3>~3HxEM=%>42O;G3~Kt+W%ur(9}Klnwzle|1~
z{6yr9*CLOSw}(c?;IMeWP6Yf25g;oDX%}1*$H(`(Qbtl6a-QD6`sD9+{etD}ju6q$
z=f^CSQ>fM_m+ec2nN;_^j;3nM7;<M&!xh6XGUG<Eiq!HF!<6BIfsZrH(r@Gq{2asM
zB2(lH#bKtXVfbSM3y6m^hz)AHl}N8Wucv?3C(E13zQk%ik7d$V7n6oqy@S=ROykDC
zhMmD~LarXgoAv8^k|^}aEr*`I`Bvjq7K+_R9#~+8>Vrk}e%DAau*B{$9NEV6%%NXD
z_eT;sEG?~ud(jyr150LtiN~|GAwu4i`!RIoRm?oFVwr*|%fWGV;Rifa<^6xERWoCH
zwelr`-vSHk%y1gl7Y_dY4Xe&POOE!l+s@zf`0=ChXX5E<yg%O8bFt+sTL=$xaSxM6
z66rgM^p8EeZyH@%yen4zyj!j6=WmUL+HN?5&|w{xzd+497`h4L_Mmjb6>E%s2OHL?
z<sr1CpxO3-XBe%0>;!R#Yf9*<vkJX)M{KWHr2-$`9H@>~d9+4jPNdG@ge=1$#~@9?
z6-SWv!kVL#o&nhzl($69@L<!#s0eXql;+{IGe~nV<D3p(;*q}Qa)ryExcmj$T)$%E
zHrXrMNDiff`x%lj+7O~G1MMKAFoP(A+$+|RO<0r_b^FPg*-b7IC!Y5<`WBFTMVXW#
z>{bN74LaPHs0JmsLX*h7;P5;p@8uWY4$%nbJPJ&B>}u|R7927{Ndrm3tS5@W*F1xQ
z-45;bAJ8%^*0X!xMy^5F8^r{Nyb4{05nOAK^+r`4$Lqgz8K*%eE>eJ!S5etiGdgK-
zLe@~aFxj&p`|jWKVQyW;z08_~xKEMTQ()8wL%vSTJnL(PqR+1`qL-Us<#??PCuEP!
zm3&VKGW$(v+LJwr16_mdk@m>GxqzCYa}y0AN-x7~V^mJ@_NLgYMe2nTYI9th<5~xV
zo1#*lYx8idDJB&;Dnhm?c5h6!_>MDB!X4Yk8U?jECTI8|Gc{(e6bv;-rA@Bgge>~p
zYq!Pp`4&p(v&>7k3~C@&SKz2%MIZb_dSEmVlJ5Uvvw>Kx-=-M>{I<FEz!b#>4TYkT
u#v6p~3dJP${uw3VdWaQO4R_KLa4g&@z2`CvBm=YInB-SX^fZ*h!G8gYy^fUt

diff --git a/ex3/ex3.c b/ex3/ex3.c
index fc2b22ff9..afc7ba6bc 100644
--- a/ex3/ex3.c
+++ b/ex3/ex3.c
@@ -11,16 +11,15 @@ int main(void)
 {
     // Your code here
     pid_t pid = fork();
-    waitpid(pid, NULL, 0);
+    // waitpid(pid, NULL, 0);
 
     if(pid == 0) {
         printf("%s", "hello\n");
         // waitpid(pid, NULL, 0);
     }
     else {
-        printf("%s", "goodbye\n");
-        // waitpid(pid, NULL, 0);
-        
+        waitpid(pid, NULL, 0);
+        printf("%s", "goodbye\n");    
     }
 
     return 0;

From e8b91adfdbf4069e23d90b21b30ed27cc220fc7d Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 17:46:06 -0500
Subject: [PATCH 12/24] added error handling to ex1

---
 ex1/ex1   | Bin 0 -> 8848 bytes
 ex1/ex1.c |   6 +++++-
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 ex1/ex1

diff --git a/ex1/ex1 b/ex1/ex1
new file mode 100644
index 0000000000000000000000000000000000000000..e908daecb190731e025c3509d6da98c641af11d7
GIT binary patch
literal 8848
zcmeHMeQX>@6`#BF*-q@7&u&AV50MST#Vz&54vulCAbbAGUUd1WV~14KS)YA-_R;$=
zcYCQF6-eYH<rESurAS7iqADOjR01S~T7+V!DUAyJkszf)1c^|!^qjOMO+(~A(j4#2
z&O7h!ouvwizsNi7zInfS@6DUHGrKc$-|P+bxm_+s<Yr%DD9v~k4w-kxF0SRGz&hCq
zrmzicJ*x!73zx!ckeemqi^4VWYN6)=UIAC9+XOn@3NH{}Z^F=mNfaS+Y;TDaQ8an&
z3R5J`n8X3J!&v=3E&?Cs1>&lRV_0yqLlNzog<Z3-BYsf?Mx6SGeZy-&_#1F5Afc=v
zV?F%7#8DS%@7qQM%WqY25xBw&#M@1n5huIHzz*a5xa1d#{i40)@^VA;kGK%o=6GzR
zqkVHc(h`p)vy&~8ogFP5?Q$k1Z{ht$|ERlT_aJYH@+g6XG2agtjsdJcbCm^u{m!38
zpG(ZI-}kkb3#TuRokV@iCHmm~G8^XEM10%LlQc9yDkW^cp%i8~jLYGhm%#&oOK>@<
z27q#YnwP;>FN1FcydI(&_76kJ>@zPwen&B#9Za8$8EhhJWLPwnev(b3V@V^*GDbvC
zr&;u=bj;A1rlG!;F~Vs>ON3)dK*kcOq(C&bBNXiF*0#u7<gMV|&40u(sV@G5`N11!
zEW0)aGs(^N3VE?^n3wQb(3nGj;>I~iV;}KG(H|Vf=A%Ota%sW&!!%*mY{79{5Vcxx
z>%8x@;MQ@kSa30gxGQz~-D>ru*IOeo_4vHu%})cYPQO}xo?0?_Ve8G65-T*_f_vQt
z1xhH7W97ot0#MU6l(9<-7rFc<%Gi~Kc`pAIW$ePjFS-0@lrd!s&vW??C}UR^X1JUN
zIXVL}r?&Tkxl0Gt+?(q3TQ~L&1TV}Vfj5A9;hdkd3nwZSmVX8eZ$;}i^f3041|1$$
zTMhtIrx$%{?(IYCUP4#c&HAA^tSDRs<zw9c(0S}tR3`Z>)(@&j-{%g_-SvP2HFrZj
zm*1|sUQ;jKHC7kB)sVNk4Q%MV+5V9)ZiM(*wtf%{^GOJ7=rykoAlHYyr8x;+nCkR)
zmi1mg19nAcAD}_u;?Tlju)#7sA^(Nm#R!C%f8%bUkn6oO{q;L+su>>JZ&pZ5&7J%0
zDyTe*xu1I$(vklGsLi36KMp0-&eqPofHl1!Utc+Q7R%e9e6n{j_sUuHJ$D5#9!0(t
zDtPI2?2MV8z?TF21Gz$AFfb50)%1R)1j#wof_z^vcRQH79C`>Ntya%{<jMc!qe4MF
z{+=PVT_O8W?pi2!y9YcJ?*E%Qecq*RyPmy<1MMqAfhPh(frA0<{LE7RKZNne{fVLI
zf;ra*(_D&%V{tvQaV1mrcs%up6#Ps=3QMEov3Nw9NT){iOlG6KZX%r4lg3hIQ$%XQ
z9y8ZE&!erty>LAOAwLcLMc^UeFF+1{gg88fSAl;YcrBz9-_J;{!~M)P>36NGt*V}J
zRrwLe7w-YEe;5@6mDgu%6V#*rPwx~86R7L+_xT!k*3~>!eS~da`{=`;+w>`fQKtv4
z+u-*o0s)`@gu8oHrTb}U*{q8IJPh&bSl{LIf5+YBYdr1g^+~5Hx_r&w_Nu<t6P2p3
zbGmAmPf7ba1HRUPuer-7fgb30`Ko!pUIg=RfgkJp2VLHydl|TwfqNPFf6l;grNX<f
z2u``cuPhSrT2o~C3Wb;O%ZzjkzOG1X_#O9K!@RUk$h1bJ?PQ~<$M-)H)&Ki$A%*g+
zTR~Rb^UZopnbv&sZc|>#OnO4_8o?U{$Mv_BaDm1NmOn`JEue)Mea~nO`2g2~@1E!{
z;mty(xbZuSB(|Z9+K0~#?@zVRhtDjRDW5lld`tAt^zy&I(>~VO(t}=wLmh(m3BF(O
zsNjbLciQjh?*4+*JUEg~8d+(p+%C7abY!{I_Kmg<xwTzxYkSD7khZk8b+mT0Zgcu@
z${rYfoo>Ym!#>ho+*eyGJy2tm)vqXyE4#jz&6m}$WHj#V`c<sl^YXwbrsr(eU%_a+
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z2ag?)bbe>-5^z79S4}wld{5}pxiRexuK<qv&OE#$^zl3c=_tQ5_AcO(DBBo3pmOJJ
z4a?vU0*?K4wz~!Ja{ezvyA7=LeH&WF|3UO$?%ZxPZDfpWG%An65!}x1ek~N-H=t<@
zPV4lsSjN!Pnvu{(<Ef;c0gXsX8;hq#!f`EPq|zBJoSkH&sl-HFH}r`7`K{a9%PVQo
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zFs<kD-GN=fZqTyS@Y6<s;0#ymRW;L_+SAXp9ics4fsnSRuWw)PfHn~53iV<O{ETum
zljXrPEjX}CTT08ou5L`qKzJms^W#oMu^w7#dL(Rw#p$P`%6a(dtVT=oBou<M9gD&P
z$fUIKa54goYQa6A6^SLaY(|GpFU5<U26-ft5pK*Q)}4p6e(_Md<KavOo+uvH+M72|
zXziG$L2oJXm<Adfwj|(juief(^tEG5&P*kY@Ca}tZSrv{!AY^6o?vn^W$1FCE7)R$
z$AmPN%*rEKI8ADaMVO4zcsMi8<j7PK{F&THn>B~@bS9Qc+5`>i(t13M2BI_(H<-**
zB|}jjOMz(UlW@nu3Q8&d2xWa-4A1chI3dY2HOHxGLFKQGf*LdvPQ*qbhLnNs0m1Pg
z!!uzr%$Nks0^1AYzZ3Ag46lOX_kh-$^gk8tQ^-5&TItguRKW$W2TlWSMR3ka-aYib
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z7jwq`Vlw`p4ECM&J+R{9v>)!cw<3F5H_wU<7wykXZ8O(YMt%@3+#8WSt*>thd-?`Y
z{G><xNwCMg7Rj^@uNH}tpdP6bE^GW8gd47#P?hXyz1}SBX@5uUJNti3*mnU(qW$6l
zVNd%@w8xw|?N0-SabbK&d9h#23wzo(o3&=FR7ReI%W6;i1iuJ)!m12qzmSPP>#(Q&
z#1Uan@sb;-{G7v{)&n!b{w4-zA!?VPA40(zKb<EW!$|=|`)X4v?f=i90`2Mf(Yj_v
z*gr;wf{U~k(O*HyYES>W(*LpTMNPBdw4Za>)4r%tB<hyK-kHDGp&oVxd=8;1t#j%B
zS*N~Jz6>^X7JJ%fHKJ1>r@mAE2k2n`#dIs~$E1&G|4*>Ru}k)}Z=?Uu>3?z>-_$;h
zgIP!Ww7*-#P63g=DJ{u_{|hRt@fY`jq5+i*1t&Y=iw=8QU#r5N;v_d@NAg`LAV&Qk
z7VG2#%h*d~D7XiL$M{<vIN9UBw^l-3B;xf@rnY&7xV<6{<nX^8D>+2&hvtq|Z$`vF
eFCN?{p>i`^)PH*a<NPew{$6o_mUcLIw*Md2E2r%M

literal 0
HcmV?d00001

diff --git a/ex1/ex1.c b/ex1/ex1.c
index ed548f630..28dc08c8e 100644
--- a/ex1/ex1.c
+++ b/ex1/ex1.c
@@ -12,7 +12,11 @@ int main(void)
     int x = 100;
     int pid = fork();
 
-    if(pid == 0) {
+    if(pid < 0) {
+        fprintf(stderr, "Fork failed!\n");
+        exit(1);
+    }
+    else if(pid == 0) {
         printf("Hello, I'm a child process!\n");
     }
     else {

From a6f4dbe66c4ba470182ba07dc4936b2d61caef9b Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 17:51:23 -0500
Subject: [PATCH 13/24] added error handling to ex2

---
 ex2/ex2   | Bin 8760 -> 8904 bytes
 ex2/ex2.c |   6 +++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/ex2/ex2 b/ex2/ex2
index 111925dd5849d0f5d20fd0756d62959e30df0b0c..e741795075904b4cea43e1666317064592293c85 100644
GIT binary patch
delta 2245
zcmZuzZ){Ul6u<Ai{&}se>+9Bb-M_ZzbVF%7lnJ8J0%Na)4+WWmaihRmSR`y213@tq
zr*oB{gOeEMCzXUCAIx;d3=;PzQ-;Ktl|*FwK&p|Xi(&{NW-($t=k`4^r>A-6+~2w9
zoO|xQ=ib}lb(b6a%N$u_m=P5?V{*mGC1<TiEL_QsSWeCaEHSZw;-Cm`J7RJH#pHrd
zOosEq%!*W%FZG@z{@8J+K7J$rUDL(7E4#>#A_@4J@Z$}}csSCpymPz~GD4+L0U6OP
ztl&IE+_(X|eb`qb*a<^ODii8>Yf3CzzZiQJR?gz~IJPir&XMhH-?=NWza!AV5{KHm
zS+b)uu@8CI%PhHTZ^!-w+uz-m=;~t0SGwA};WcSx8D>L2%1Zz7U@$6qgl#Y_d5iQ>
zjM!m;TT;)_ur{t4HT3DE&ePw|2|LxE-(>Z;@f)j;sc(&S8*{*wU&|A^XF=wde~u>k
znlF$Sd&AfwyoWkxvw5VN^MsGmg3eBH#mA(e{Ab5F{(!JVc#z{$gbjp0<oF%JG?UqW
zj^7|mn=_l@croH+KVnYxx1#AxtD62<?fK<)Y)f=<jN!JosgvXV<}gzyC$E{pEVmmy
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z$EreF^#o>5+sZJ03PnH47|LE8`y9$JF4bj}gV17r6pvck95f#K3vJ;m^Mn3tdR7se
zy;odYWD<uKnPtXsM_C(wogm0f#?u%}9NHwGF<1vpVN~NVCMdT(?5H&sAgwErL59t?
zR{x+B=8zwLY>kOw<cwK4XDk63+iKw)D8*iX$`IyS{XE4qj9G9B!6vi{X<D332dQb(
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z2kVnzjpM8kgN(x|;r$0f$@ZvS+Y8;e0vjT;vDgBAK-2dx(62+ifVb%$_@pE#4w_)5
zq*Xj*fu~B}74dezQW_AM41bmeJTW|+^Qj4!-_AUkN5mNvanrk;0Zi^AXH#_R0#iC(
z%DfpHv^d|R-hs)|eL|GroUsf_J0{f$^)9zZf2Njby*K#4v;aF?ZVO#PM8j~*wF(UG
zQlS<Ex7+hH-iwNe=`F}bg^bIq=rzk-k?kZOrJH=_KP^LwyGpE~=Oi3%+8AB4cKfox
zvcU4f6O#Cs4wiaWnhGz>&{j{Y0K?^3;UO5P2r6S@7>A$}zy-Sv)2P+Y#~@wUND1&%
z1{If9<1THDN?}`N(5hE{$N;A*8x;L`#5AK2OrxuQh*FyN9C)gNR(+<mM%Y}1u3EXr
z_<g~!ga^=QO4Cjm;c8XG{XYg-&1kU*<<$YJUdVL7s~Z%(e(l;ReHI3)gI2wIv3Ral
zH(2|$BJY!j9Nu053uM3-1lezg>%Ndh-<&vPd~U%9b^b?$IBfE-7Utljf3@Yby|6ad
SVcP$swbNZdeIm@1SN{XfHwE<o

delta 1888
zcmZWqUu=_A6hGhh_3t<6`gL^eC|lRT)S+ujq633wZDjD35K{&dLf9-rmJJB&_+xlM
zIw!+IW;V}@#s`fL2<QWD(G(xHk?Dp!nC(GhmPocmOy?g`%p`pfKhM3r#buu6JLjI?
z{oQlVz4zSP+fA8mgI*VyBfzAf0nV-++IU4hXyYIpv<=M$?Gd@)>8ME;U14j%3tJ0g
z!dAR4%~t-^(|^DBz`z&X8+v*_oot(V?}IzvNW|nH_Si$1QoK?vK9D_9CD)rVpm;D&
zsK$IB9PesB96Z$>Y=DmL<dGAkPacDg!^gW%;a%nV5*gSJn8uK)LfVcolOI#2v*-1`
z-);J3^SP30&@YUiHfN6!P4D~KHbIuec<v;18MUWLm--{rVtyy<TAVXTYL7CXrMfuH
z{dVTF$ri`Ce}MT4^KWp!nfWH>e`FZvDS%8s#~=Y*HvJJx&$Q|31-<X*TzqeAYCLC&
zfIf9A#m&@1+V$*3inP>G>fZ*C+2>3^i(Vfmqxa<<divh$z6=Y+)}ytKu?}O7$ZzrZ
ztrKh+9l?UX3Sg8GTJ+xgaXetDeX2k&^+W4KVS?0)@2k}SXS5ayojpM_w@#Y-Rs6)V
z<-Cawa?DC9JMoWU=;@|>_6{}DO-p^}mf%cKzuc6+>7@RzJfub|N$Ke+o?W(=ji7!4
zvMtp9?HSHq&)9YUWA9nUev;ZeM)=!_=)UMH(X<h5iSFGsQ2U0pnwBz9&+ML9`e7{n
z{jR!u{ETlsQnF(>YHi1$t-4<FDO;bV{V>y)cw`tUveRVaWG5;7RkCqf>TR;)c+U2;
zbQZ7KLgpX;HjD)RWLqC7C)OqEg{Z^XFTb?fB41c#rP`+>f!F9uVZgq_e3e-8NRRzP
z(@4s`K~ks1ow;GgwT>rTNmGQV0IRtMSh8TVqb-n7A{?*?I3pK)Rrt*~<7lLev{HW{
zFSz1r!JP0Z6)s-fO{{T&(vrFvEEPH-C;VaDq?KXHe(+tVH*iH{^`)?r!u}xaFE~`{
z!Gtp-WpKvnRxFU9;U0+vaVs|3FlOyA$E^x^Zc8AEhX`K<gWRr$9JdYte4u%DE?FWX
zssD@uP5`Qfm7;(K#Ybd$p8_uEv|_XCiWI?lms?p2an#CQjfKU&7s)<q$l!qF3Op$A
z8!K>jsuHkhH_Jluv>AUbYm@ieaOawLWO~JB*97I91yy&jB0{%mx$K~=c0vV>-0cp@
zbii-AgOuFo?j13G1$B(5+Oid!M4aykcTuwJ1z>W7Yk(QDPD*M&M$0`F#pigV=)KD)
zW-0fSd+hAlU~&nE%D1{TnG#wtdktzHzgDbBPA2sN&X;>elAdxIKdaa>lCOwMxZSrP
zt;4!?A+1=L8S%_t#V$e<N`wzjuvd?y8LtsKEYM+rI&g7aNG%rTxPmp64ceR_%?Xkh
zyDCFkvBvWPrMp-eQj4i3O}Icq2Ss%bifv0^T~$cU2{dQI_Ns=*|5^OvQ)+)oc)cp9
z7Hf}=XQ8S=dt7o>o<D@K&L2{X1xM%I?r%^#MO}7UM?UuVOLV4nfsnm;{1H49*o^xF
rPRWK{K0n?Lc%?Yb2O6ag4AeB*-=@N5GKgI@n^mu;;Jqy4QD4=+IO@SG

diff --git a/ex2/ex2.c b/ex2/ex2.c
index acf77a641..c93f470b5 100644
--- a/ex2/ex2.c
+++ b/ex2/ex2.c
@@ -14,7 +14,11 @@ int main(void)
     file_pointer = fopen("text.txt", "r+");
     int pid = fork();
 
-    if(pid == 0) {
+    if(pid < 0) {
+        fprintf(stderr, "Fork failed!\n");
+        exit(1);
+    }
+    else if(pid == 0) {
         fprintf(file_pointer, "%s %s", "Child", "text.\n");
         fclose(file_pointer);
     }

From f48f21b3403fc1644b9cfb6f581125e4f7212f1b Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Wed, 20 Feb 2019 17:52:38 -0500
Subject: [PATCH 14/24] added error handling to ex3

---
 ex3/ex3   | Bin 8704 -> 8848 bytes
 ex3/ex3.c |   6 +++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/ex3/ex3 b/ex3/ex3
index 8b12e293d7d9bf5a0038079367e471dbcdde24e5..092bb2a9be5b2a317132cfa86204e82b8fdeec49 100644
GIT binary patch
delta 2173
zcmZuyYiyHM7(QRWeZ9fDe%*T6wXHZ9D(wK-xWw!$4EU-u8JA(b3|d?(lf^Y#2lB(L
zW;oISrsIvt<d54Ak@!n869z`sIb~?jFcOnxzZe12sTf?y!VjRn=k$DLBb=t^J<s!=
z^Ip#7{gRF8?P-^smJ~u;z9;0y!0NBe*Nu!L*Np=+K9j1;qcF(A3EPk%kA@8SB|`@I
zTA11R<lEPNTK`$-UVY@=RN}k&u1mjtIZoG6O9KA&_-6w`m^sRCnm<_qQ$hvQiY}oR
zrgTnWD+r=fsG(!Hp>qjdHgbushB90rlQI&vhH;cP%my9p2jBH|clzo`^uzW9iT5PB
zNvyN$FzHUTMZ3C4>}XeeA`0(_8?ES?I;TDR!53nwunR7U?n2G1L`}o5;^E$n+!4)}
zMbEquqAcS1UNDW?_qS0!DM`ybMExX_kg|P9t9?HjC-_1xavSE&9+InmfPIl$!4buW
zsCMpF4qNq~6!+3yo4dh?+mxV@&t({%p;)B&8-{OETtM*<!@p2WGnq>>+=V!nM$FpU
zd%@Jyel>Ml?Yncod2ets6UVbuC&vjBll^*yWRLE}l@DS??nXjJ4`9kI>Y5M=weO)t
zP2D|GK1yxTMCH~os>t2K$;X+4)(M(d%%|ZiRNtb0{7(orOVz9Lvy0rMbs}#+`HB|<
zBt3EqTF!oej$5xv7U-86dym!NmVR&Y5H&S^xe%>iq1!Tc93#!1dy>nIQJ6i2qrQ(G
zk)GvaXQ-wL@n2OZw?Dd!T5^SUsmbg<I)9MrU&0ZK|7VO86AZi&*cV9U0xf~PO{c4$
z=sg(i=`|=FWKS@)5KR5vwE8YP-|@#{_Tppk>sxm3z&qxNMcO-}ZC*1u6z%BfB=2>0
zwjDecB|^El<z@6L;XnR3mrJ6&kFpu%AL#r%$}r}64JAEdD@}vIRsD0qAk69gQua|U
z7l%s23U3`w@1fd&#oDjiR;bs-mm7?PVA!M$|7nOAc1oi-OE+@Cutze7^$OB>PxVk{
zS!v4_<RRTW+7brXZQ1V~6cq-wo1M|+v6-=iw8E67K}dsK<o1TR3GKGmaEwu~Rtvju
zmXWiVPA8>VN+|DhyZ{45Cth4BDO5@7xZJ_zJ}zTi9+4C*4R%niqe2D**@+voR<?@<
zvVhVl7-0aBiPSJ@CLt!5kt|AQua#S2u6QSsLXvzYZy{P0Tspr9H%nPev9U<3B>7BU
zCcG#XFIglK8<{r1X4^SIg;|?Z2xD&tOYy70%v14{<3b&=V8KzAnDB94d5UjDUcjPw
z2!@OOy09K@7Vp<xGs3!(Pjy(Be<<+_2AD7Lp<}PzFN9#1-G$8icFKHi_XnHtWiD>#
z@zmr+2^MhWMdWQXFrIjn^HV6T7(g6khqF}M#uvDD5?4`e2m%hLiPja`dLZK10(TrG
zLNUzZs#RFoWL+ttbzyN^4;LJ6S-ZcQ=5@M8K0wzj{u+$@>oDr7=@&pzb~XjKZac8f
zx6ZeLSN|m(Jalc+=RXc3D@xxMAX#=xcpf6<emSF4n4b(Sw%Dd&7+LMD4APQ|trcdG
zT@V$97C37IZ-w8iy#iwayj4*rYfq(yZ)7bDSNLV^L4`P*hS>_gNy{_~rIq!vc7?4H
z^MX4Zsq~w*3!IeTY-Qd5U+*-ZbQ@+XYfb!&@THek)i38LX+S&pbuET?mB-94DqdJP
zTUBSC=98ukBQsU~0$z@Y$8S>kf#6l~)K_X>$dEN35Epqs4WIG4@P?Io8-xjX)7xN5
U^BEZ!_ST!4o%xyFFza>y2jjZl>Hq)$

delta 1783
zcmZuyT}&KR6uvXF|ApP1{RNi&!(aoE9ri(3(^Pg5WtLz-g<2aSoBkkG;<6S{8<S$F
zG+R@%>>+CE3mQ^OpQyyT4^3G@BbfNmHEKxH2SO|XV+|z6)Q7U3JA22F#*^GR^L^)>
zd(WIXXD0Lfcw44I%xj{AO6iJvs_tvkO})aAoBFA{A!CFup(u#l1>3Z)gr;?+kZB!U
z<L-Lxvpp}o)^%*-i_HPw=CPkQA2fe{gF{bc!ID9Oh)}_KVV8GnCFBE8;OsCcRAhY`
zxW_vjWa#wq6QMK7P!ky*9XUe=lJC3)i$bK9C-nT%mBan$j#gY$MypO6sqI+^YW#3i
zlQ<_&{9%wk)_!{+K;)0|BigMK=q69xHY_Uv|6Phte}yi^+F86>{87B4c#zt+*NZ5%
zmno))ZQoIFmSUR9c3#03DHbT6S8yxhfpZxo6bV0wrwjdZdPAQ0ZKt~@zLFotipeWW
zL{Td@v{AD48Akp!VDYyRlIyZ2NUz)=qmm~cn&tHUF;9+eMV~|LTcn2KIy#?M_U~J!
zX%B={e2dz9HS&jl%3#vf9xS<A{G@NWbinxGf+>I{6MJ#%t+(;yzVEfS;E1lxI9j%N
z9<$oI3<aIDeRi){T)ar}S-ewH_yG?iu~%b9V(DV6H`dd6sdi5vz;rJ)Q2k0g{dYY5
zOK07ErTj~egf0CZNc!H^!Bay+N%BTAdGh%Cr!a5MBOGc(t;O}@qhj#`)KB3lov3Rt
zrCHQNsBfdbhq{b|U-dQI8vLV|v@!;CLxbUo;24IqqYH_dt&{w7<vPB#Om85h4XKm3
zW*}u~*RG-$zp!NJ(k|RFI5<-VOHO523svSPZ4uV`<qAp2hz?#h_XlMmst~NtNscdJ
zlfn|x0R?jlmjKb?cdjvCHZLSkF&wUO!|N7DaE4j&Ig&J(V>|3HoP{aNg~~CO#w639
zGJOS7q8-*b4IH)RxEzS0o0B0XIt4w+qIPpL3Nn(sqD^E?(FaHbzC>#R<DEh|nOC$K
zy%2X=@G&vR$3(!18vkEjB<i5=4-trstm>e{c7=<;uFVZQHW&Ep9q}EOyz1=18=ja+
zBP+eihZsNn7*AgyN2-Vn*X<IY(ZYtkpU>%`)$s|BUz(pB5~l;+8Ny@3P6@6$tuX8~
zB6n8d=A2SIigU1Eu4386eb1+1#_y1~VQO?9snGVMQov=!6uKeka#yO~$9ly^$O=YL
zs|+u>+(tUYRN5isI^-1jN<znOzm&tS%P*>}rdkfdlFPl&?dEuRw=%M@T=^mgX3qv!
z4Z9vmR68!mKD-$SS4*PWmook4pmabA*{l#%P?oV}aJ^bGshu|?!0**fVxBqWnNtOX
zy^^Rl?;2yVVZ4%2O*H~@-exhu-e-bUts8c|l4+i?^BSo4;r0yXnbS9r@--S+S#hea
z`I^fZ8rNaA_!F>a{Q;BOS@>e>{Y|D-=Ci6>c+)@0(as8BKCGY-s0%iWYI$Y$2QWa`
l<A+SJ0!L#m*usTjJJ@0zXV&*1T+?iP=u#>~o`F=2|6lugk$(UH

diff --git a/ex3/ex3.c b/ex3/ex3.c
index afc7ba6bc..14b02bae9 100644
--- a/ex3/ex3.c
+++ b/ex3/ex3.c
@@ -13,7 +13,11 @@ int main(void)
     pid_t pid = fork();
     // waitpid(pid, NULL, 0);
 
-    if(pid == 0) {
+    if(pid < 0) {
+        fprintf(stderr, "Fork failed!\n");
+        exit(1);
+    }
+    else if(pid == 0) {
         printf("%s", "hello\n");
         // waitpid(pid, NULL, 0);
     }

From d9c5c67d65624e09ff5a6ab07a8733ef60542e42 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 15:43:03 -0500
Subject: [PATCH 15/24] set up basic code for ex5

---
 ex5/ex5.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ex5/ex5.c b/ex5/ex5.c
index cbf3b8e61..85aac22e5 100644
--- a/ex5/ex5.c
+++ b/ex5/ex5.c
@@ -17,6 +17,13 @@ char* msg3 = "hello world #3";
 int main(void)
 {
     // Your code here
-    
+    char inbuf[MSGSIZE];
+    int p[2];
+
+    if(pipe(p) < 0) {
+        fprintf(stderr, "Pipe failure!\n");
+        exit(1); // yesterday's error handling example
+    }
+    pid_t pid = fork();
     return 0;
 }

From ef362409dc71375910ef09bf67f19255d3b1022f Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 15:57:04 -0500
Subject: [PATCH 16/24] ex5 complete and outputting successfully

---
 ex5/ex5   | Bin 0 -> 9104 bytes
 ex5/ex5.c |  22 +++++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 ex5/ex5

diff --git a/ex5/ex5 b/ex5/ex5
new file mode 100644
index 0000000000000000000000000000000000000000..ae913b025a34992bd884dbcbcf0586a3eb962fa6
GIT binary patch
literal 9104
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zXY-my0nfaVn12h(W_#WrO;A7_uQY<2UH-n!p1&ui$o?CgSaQJavcDhL?0LUcLk9|c
zuE6^C{{NWlxf%XmQpj*G8xptM|J-KJzdQ5q(arzC{;bWO_j#wO{r7D4_WZp7_4r!{
zJudnEApbsX*SE{BfNhn@p3j$R(J7E!-!A_dba4E+ecoRxAJYDHu*IQfd)|lg{}0Tg
zb0C@y`FMC9oPs)Y`@COW#!dm*<7Juo+n{5%7yO+|4Gf_Z6R{ohWvDaT^LP6Y+1HzF
zvB-7|Unh+FKTGXDM)urK)>pVd+y#we`#u}a_V~N9nNSyrc{P-|ZCOFLXK3MA$BKm8
pMCpg09kcx$1>T1*C!mkPbq8GBe_YFuaGDou-$M#NvpKi7|8L0jD`@}#

literal 0
HcmV?d00001

diff --git a/ex5/ex5.c b/ex5/ex5.c
index 85aac22e5..3e235d9fe 100644
--- a/ex5/ex5.c
+++ b/ex5/ex5.c
@@ -22,8 +22,28 @@ int main(void)
 
     if(pipe(p) < 0) {
         fprintf(stderr, "Pipe failure!\n");
-        exit(1); // yesterday's error handling example
+        exit(1); /* yesterday's error handling example applied to the pipe */
     }
+    
     pid_t pid = fork();
+
+    if(pid < 0) {
+        fprintf(stderr, "Fork failure!\n");
+        exit(1); /* fork error handling */
+    }
+    else if(pid == 0) {
+        /* write the msg entries to the pipe */
+        write(p[1], msg1, MSGSIZE);
+        write(p[1], msg2, MSGSIZE);
+        write(p[1], msg3, MSGSIZE);
+    }
+    else {
+        for(int i = 0; i < 3; i++) {
+            /* reads the data from the pipe and outputs it */
+            read(p[0], inbuf, MSGSIZE);
+            printf("%s\n", inbuf);
+        }
+    }
+
     return 0;
 }

From 86c5673f9da2917c1c12ff82b04101dcac7abdf4 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 16:10:37 -0500
Subject: [PATCH 17/24] set up basic ex6 code, just need to add writing logic
 now

---
 ex6/ex6.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ex6/ex6.c b/ex6/ex6.c
index 17532d65f..f8706267e 100644
--- a/ex6/ex6.c
+++ b/ex6/ex6.c
@@ -12,6 +12,7 @@ and `clock_gettime()` should work just fine.
 */
 
 #include <stdio.h>
+#include <stdint.h>
 #include <unistd.h>
 #include <time.h>
 
@@ -21,6 +22,17 @@ and `clock_gettime()` should work just fine.
 int main()
 {
     // Your code here
+    uint64_t diff;
+    struct timespec start, end;
+    int i;
+
+    /* basic structure */
+    clock_gettime(CLOCK_MONOTONIC, &start);
+    sleep(3); /* this line will be replaced by the writing, just using sleep as a placeholder */
+    clock_gettime(CLOCK_MONOTONIC, &end);
+
+    diff = BILLION * (end.tv_sec - start.tv_sec) + end.tv_nsec - start.tv_nsec;
+    printf("Time elapsed: %llu nanoseconds\n", (long long unsigned int) diff);
     
     return 0;
 }

From 83a17937a5af8bee723daa350dd51780214b7a80 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 16:20:43 -0500
Subject: [PATCH 18/24] ex6 now complete, today's MVP met. Will begin work on
 stretch shortly

---
 ex6/ex6   | Bin 0 -> 8872 bytes
 ex6/ex6.c |   6 +++++-
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 ex6/ex6

diff --git a/ex6/ex6 b/ex6/ex6
new file mode 100644
index 0000000000000000000000000000000000000000..7930946561c0fa3fe6aaa31672d6f217f1b7e0ff
GIT binary patch
literal 8872
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z87dGd$A3`e5Vupp=h?OJD%SHMFT;O}*9Ka=L6s1GvkhYjHc5oUsk{OOIcalii7g5T
z&=f#+6l=h*MC5%cA>80N4loxx63MQP?dsT0_%sJ5T<S-4qklL1>-GjwA~{G5+SRkb
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z3il(oQZ^r!6kZ)iQ=_0Kl2%j?wRYB9;USiW5*fWe6T>_GSOj#EhQsM$&?83@=+EX>
z%Fa0)O{HVWM3G=(UJCDs$beI$aSL=+Jsp$!P!dHeI)+agzo?W{-K0l{dBhG!(1}R4
zsXcUU3rT-v0M)RV@JMU`V@O)$9uewu9orFfoJ1oyF`RS!ze&^k8keB_IYIWJ^8HHA
zFH#2SI_XvvD)EoYh9cRo%J(6SabdE4icH@#oc6M>wb<c0QDpA6Z%6!7JYz`tlir}x
zoOIcjE3|M9V-faXg3eT8KjjUg1h`*T4BoVvy341!%XtWQVv6p;C!M*(UiQ<Id=Puo
zR?9!#?ROA!=*%ScvhUWoqVkTB_(f0nA+)D6n8>m}Z(;i&mt29|89&27`zcZtd)dd2
zvAvx8q<nY%A7=Yjb}0M(XW3rPon%jK=C*$VF^Y@gBa(AL3l}KoX*<`BRno+>_;=dN
z`Js>PN1e);4zMizyDob<XH2ub#4B#x^7mc#@*baI`_0m@u5!iS4_)?hZdt_z$$4A!
zxmiVopRv6ZBl{GM?d$TIcETP1FJ1QXJyyQcHo5HG<)3!h%X#S-7xanC-d+AHm`|Ue
zdAj7!Rr1}|t?!m!N84(Ly_~;l$tjXs-!1<Mb!hxZ`EpLvuG0RmXiH;P?BzTs-_@td
zIg*TTDPP9lB<4BGm+y!3R4F9Ux21wC_y?Hbw9lUpxd1~9nTwt9d6&KHmkqX;IK_?F
ziF^eUgh~BnpLyUa?R^+L#or(fnTx&pRO`qiT_WK%n3l3t20vcsi@N2a$hb>Xeq`=A
j?I$??Dekz>W9BCOOZ{d2r}<f`{Jng!_K3^5yZrwEO&`fl

literal 0
HcmV?d00001

diff --git a/ex6/ex6.c b/ex6/ex6.c
index f8706267e..263ac7b7d 100644
--- a/ex6/ex6.c
+++ b/ex6/ex6.c
@@ -28,7 +28,11 @@ int main()
 
     /* basic structure */
     clock_gettime(CLOCK_MONOTONIC, &start);
-    sleep(3); /* this line will be replaced by the writing, just using sleep as a placeholder */
+    
+    for(i = 0; i < number_iter; i++) {
+        write(fileno(stdout), NULL, 0);
+    }
+
     clock_gettime(CLOCK_MONOTONIC, &end);
 
     diff = BILLION * (end.tv_sec - start.tv_sec) + end.tv_nsec - start.tv_nsec;

From b0fc0530b4620183444f85f10154feda77f25170 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 16:43:44 -0500
Subject: [PATCH 19/24] starting work on stretch, creating random number
 generator

---
 stretch/src/bankers.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/stretch/src/bankers.c b/stretch/src/bankers.c
index b44aed25c..13d4a6e43 100644
--- a/stretch/src/bankers.c
+++ b/stretch/src/bankers.c
@@ -90,6 +90,14 @@ int get_random_amount(void)
 	// !!!! IMPLEMENT ME:
 
 	// Return a random number between 0 and 999 inclusive using rand()
+	int i, count, lower, upper; /* upper and lower will provide our rand() range */
+	lower = 0;
+	upper = 999;
+
+	for(i = 0; i < count; i++){
+		int rng = (rand() % (upper - lower + 1)) + lower;
+		printf("%d ", rng);
+	}
 
 	// ^^^^^^^^^^^^^^^^^^
 }

From b8b1dc907d58c8ea5b4c2707ca163cda23371dd3 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 16:45:02 -0500
Subject: [PATCH 20/24] forgot to add count value

---
 stretch/src/bankers.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/stretch/src/bankers.c b/stretch/src/bankers.c
index 13d4a6e43..a79b00c28 100644
--- a/stretch/src/bankers.c
+++ b/stretch/src/bankers.c
@@ -93,7 +93,8 @@ int get_random_amount(void)
 	int i, count, lower, upper; /* upper and lower will provide our rand() range */
 	lower = 0;
 	upper = 999;
-
+	count = 1;
+	
 	for(i = 0; i < count; i++){
 		int rng = (rand() % (upper - lower + 1)) + lower;
 		printf("%d ", rng);

From b3b9bf3412ce8c8fc57beffc810e7960175a0b63 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 17:40:56 -0500
Subject: [PATCH 21/24] doing some research for the next part of the stretch
 problem

---
 stretch/src/bankers.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/stretch/src/bankers.c b/stretch/src/bankers.c
index a79b00c28..9d5191806 100644
--- a/stretch/src/bankers.c
+++ b/stretch/src/bankers.c
@@ -94,7 +94,7 @@ int get_random_amount(void)
 	lower = 0;
 	upper = 999;
 	count = 1;
-	
+
 	for(i = 0; i < count; i++){
 		int rng = (rand() % (upper - lower + 1)) + lower;
 		printf("%d ", rng);
@@ -129,6 +129,8 @@ int main(int argc, char **argv)
 	// Store the number of processes in this variable:
 	// How many processes to fork at once
 	int num_processes = IMPLEMENT ME
+	
+	/* learning about getopt() right now to try and parse arguments */
 
 	// Make sure the number of processes the user specified is more than
 	// 0 and print an error to stderr if not, then exit with status 2:

From 4da6f305a7424cb996a28132e815170eb7870c91 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 17:52:48 -0500
Subject: [PATCH 22/24] getopt() seems unnecessary for now, added initial argc
 parameter check

---
 stretch/src/bankers.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/stretch/src/bankers.c b/stretch/src/bankers.c
index 9d5191806..9ac030d0b 100644
--- a/stretch/src/bankers.c
+++ b/stretch/src/bankers.c
@@ -125,11 +125,14 @@ int main(int argc, char **argv)
 	// message to stderr, and exit with status 1:
 	//
 	// "usage: bankers numprocesses\n"
-	
+	if(argc == 0) {
+		fprintf(stderr, "Usage: bankers numprocesses\n")
+		exit(1);
+	}
 	// Store the number of processes in this variable:
 	// How many processes to fork at once
 	int num_processes = IMPLEMENT ME
-	
+
 	/* learning about getopt() right now to try and parse arguments */
 
 	// Make sure the number of processes the user specified is more than

From eccf103e5d7eadc0bec9ff6283a342401e509230 Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 17:54:01 -0500
Subject: [PATCH 23/24] bankers.c running properly so far

---
 stretch/src/balance.txt |   1 +
 stretch/src/bankers     | Bin 0 -> 13768 bytes
 stretch/src/bankers.c   |   4 ++--
 3 files changed, 3 insertions(+), 2 deletions(-)
 create mode 100644 stretch/src/balance.txt
 create mode 100644 stretch/src/bankers

diff --git a/stretch/src/balance.txt b/stretch/src/balance.txt
new file mode 100644
index 000000000..1746da631
--- /dev/null
+++ b/stretch/src/balance.txt
@@ -0,0 +1 @@
+10000
\ No newline at end of file
diff --git a/stretch/src/bankers b/stretch/src/bankers
new file mode 100644
index 0000000000000000000000000000000000000000..f922dbc912546168e75ab9b102cd64ec0d14597f
GIT binary patch
literal 13768
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diff --git a/stretch/src/bankers.c b/stretch/src/bankers.c
index 9ac030d0b..50358ce34 100644
--- a/stretch/src/bankers.c
+++ b/stretch/src/bankers.c
@@ -126,12 +126,12 @@ int main(int argc, char **argv)
 	//
 	// "usage: bankers numprocesses\n"
 	if(argc == 0) {
-		fprintf(stderr, "Usage: bankers numprocesses\n")
+		fprintf(stderr, "Usage: bankers numprocesses\n");
 		exit(1);
 	}
 	// Store the number of processes in this variable:
 	// How many processes to fork at once
-	int num_processes = IMPLEMENT ME
+	int num_processes = argc;
 
 	/* learning about getopt() right now to try and parse arguments */
 

From 7994275f4a9ba2a8b947cb2ca042d1bc042a18ee Mon Sep 17 00:00:00 2001
From: Evan Carlstrom <evan.carlstrom@gmail.com>
Date: Thu, 21 Feb 2019 18:07:24 -0500
Subject: [PATCH 24/24] first outline for stretch solution, working through
 some errors

---
 stretch/src/bankers.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/stretch/src/bankers.c b/stretch/src/bankers.c
index 50358ce34..a8af00cc1 100644
--- a/stretch/src/bankers.c
+++ b/stretch/src/bankers.c
@@ -165,17 +165,29 @@ int main(int argc, char **argv)
 
 			// Open the balance file (feel free to call the helper
 			// functions, above).
+			
+			int fp = open_balance_file(BALANCE_FILE);
 
 			// Read the current balance
+			int read = read_balance();
 
 			// Try to withdraw money
-			//
+			
+			int withdrawal = get_random_amount();
+
 			// Sample messages to print:
-			//
+			if(withdrawal >= balance) {
+				printf("Withdrew $%d, new balance $%d\n", withdrawal, balance);
+			}
+			else {
+				printf("Only have $%d, can't withdraw $%d\n", balance, withdrawal);
+			}
 			// "Withdrew $%d, new balance $%d\n"
 			// "Only have $%d, can't withdraw $%d\n"
 
 			// Close the balance file
+
+			int fp_close = close_balance_file(BALANCE_FILE);
 			//^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 			// Child process exits