Working with the Unix OS

More documents

Recommendations

Info

Interprocess Communication shmat shmctl - attaches a region to virtual address space of process - manipulates parameters associated with shared memory shmid = shmget(key, size, flag): - size is number of bytes in region - data in shared memory remains intact even when no processes include it as part of their virtual address space Shared Region Process Table Per Memory Table Process Region Table Table ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- virtaddr = shmat(id, addr, flags): algorithm shmat /* attach shared memory */ input: (1) shared memory descriptor (2) virtual address to attach memory (3) flags output: virtual address where memory was attached { check validity of descriptor, permissions; if (user specified virtual address) { round off virtual address, as specified by flags; check legality of virtual address, size of region; } else /* user wants kernel to find good address */ kernel picks virtual address; error if none available; attach region to process address space (algorithm attachreg); if (region being attached for first time) allocate page tables, memory for region algorithm growreg); return(virtual address where attached); } Where is the best place for shared memory? /* ------------------------------------------ */ /* attaching shared memory twice to a process */ #include #include #include #define SHMKEY 75 #define K 1024 int shmid; main() { int i, *pint; char *addr1, *addr2; extern cleanup(); 159
Interprocess Communication for (i=0; i
Page 1 and 2:
UNIVERSITY OF ATHENS DEPARTMENT OF
Page 3 and 4:
Figure 27. Driver Entry Points.....
Page 5 and 6:
Introduction to Unix ! Execution ma
Page 7 and 8:
Introduction to Unix It works in th
Page 9 and 10:
Introduction to Unix * matches 0 or
Page 11 and 12:
Introduction to Unix vi file-name s
Page 13 and 14:
Introduction to Unix 1,$s/^/>>/ 1,$
Page 15 and 16:
Introduction to Unix ! Special Devi
Page 17 and 18:
Introduction to Unix Working with F
Page 19 and 20:
Introduction to Unix ! Communicatio
Page 21 and 22:
Unix Shells 2. UNIX SHELLS Back Quo
Page 23 and 24:
Unix Shells ! CASE Statement case t
Page 25 and 26:
Unix Shells two lines !Y@Y@Z@Z@ZY c
Page 27 and 28:
Unix Shells if $append then tee -a
Page 29 and 30:
C Programming - Basics main() { int
Page 31 and 32:
C Programming - Basics e.g. i += 2
Page 33 and 34:
External Variables A C program cons
Page 35 and 36:
C Programming - Basics main.c #incl
Page 37 and 38:
C Programming - Basics default: pri
Page 39 and 40:
C Programming - Basics struct tnode
Page 41 and 42:
Unix Tools 4. UNIX TOOLS Tools of t
Page 43 and 44:
Unix Tools Korn shell ! .profile HI
Page 45 and 46:
Unix Tools grep "$name" $PHONEBOOK
Page 47 and 48:
Unix Tools awk '$3 > 0 { print $1,
Page 49 and 50:
Unix Tools END { print max, maxline
Page 51 and 52:
Unix Tools Let an example input fil
Page 53 and 54:
Unix Tools Brown eqn 1 # output Jon
Page 55 and 56:
Development Tools Make looks at the
Page 57 and 58:
Development Tools /* compute size o
Page 59 and 60:
Development Tools #endif #line cons
Page 61 and 62:
Development Tools 1.1 5 lines Retri
Page 63 and 64:
Development Tools In Emacs, you may
Page 65 and 66:
Development Tools */ %{ #define YYS
Page 67 and 68:
C Libraries 6. C LIBRARIES Input an
Page 69 and 70:
C Libraries } while (!feof(fp1)) pu
Page 71 and 72:
C Libraries } free(p); /* what is w
Page 73 and 74:
C Libraries } if ((fp->flag&( _READ
Page 75 and 76:
C Libraries /* dirwalk: apply fcn t
Page 77 and 78:
C Libraries } switch (pid=fork()){
Page 79 and 80:
C Libraries What is curses? - libra
Page 81 and 82:
C Libraries } if ((fd=fopen(argv[1]
Page 83 and 84:
Introduction to kernel 7. INTRODUCT
Page 85 and 86:
82 Introduction to kernel Programs
Page 87 and 88:
Introduction to kernel } { printf("
Page 89 and 90:
Introduction to kernel The kernel r
Page 91 and 92:
Introduction to kernel UNIX Interna
Page 93 and 94:
Introduction to kernel File System
Page 95 and 96:
Introduction to kernel Every proces
Page 97 and 98:
Processes I Process States 1. Execu
Page 99 and 100:
Processes I } printf("%d %s\n", cnt
Page 101 and 102:
Processes I dup (and other similar
Page 103 and 104:
Processes I The u area contains - p
Page 105 and 106:
Processes I The Context of a Proces
Page 107 and 108:
Processes I Process Control use and
Page 109 and 110:
Processes I Although the processes
Page 111 and 112: Processes I Handling Signals - proc
Page 113 and 114: Processes I USER=neville PATH=/user
Page 115 and 116: Processes I ! Shadow Password /etc/
Page 117 and 118: struct timeval { long tv_sec; /* se
Page 119 and 120: Processes I F_SETFL set status flag
Page 121 and 122: Processes I process is the child pr
Page 123 and 124: Processes I Rules about sharing of
Page 125 and 126: Processes II 9. PROCESSES (II) FORK
Page 127 and 128: Processes II /* background.c */ #in
Page 129 and 130: Processes II } while (1){ printf("p
Page 131 and 132: Processes II } /* child */ signal (
Page 133 and 134: Processes II int readline(int fd, c
Page 135 and 136: Processes II { } char process_name[
Page 137 and 138: Processes II - Pipe in a single pro
Page 139 and 140: Processes II System V IPC - message
Page 141 and 142: Processes II int msgctl(int msqid,
Page 143 and 144: Processes II For every semop operat
Page 145 and 146: Processes II /* client loop */ mesg
Page 147 and 148: I/O Subsystem Drivers frequently sl
Page 149 and 150: I/O Subsystem Terminal Drivers - In
Page 151 and 152: I/O Subsystem Canonical Mode algori
Page 153 and 154: I/O Subsystem Raw Mode Raw mode is
Page 155 and 156: Figure 43. Pushing a Module onto a
Page 157 and 158: Interprocess Communication } { ptra
Page 159 and 160: Interprocess Communication T ID KEY
Page 161: Interprocess Communication }; int m
Page 165 and 166: Interprocess Communication /* struc
Page 167 and 168: Interprocess Communication ! Compar
Page 169 and 170: … connect(sockfd,(struct sockaddr
Page 171 and 172: Interprocess Communication Address
Page 173 and 174: Process Scheduling Page Tables and
Page 176 and 177: Figure 49. Tie breaker rule Process
Page 178 and 179: Process Scheduling Clock - restart
Page 180 and 181: Process Scheduling Figure 57. Mappi
Page 182 and 183: Figure 62. Sequence of Swapping Ope
Page 184 and 185: Buffer Cache The kernel takes buffe
Page 186 and 187: Buffer Cache The kernel places the
Page 188 and 189: Buffer Cache Process B will find th
Page 190 and 191: Unix Administration 14. UNIX ADMINI
Page 192 and 193: Unix Administration Example output
Page 194 and 195: Unix Administration *) IN=-mtime -2
Page 196 and 197: Unix Administration Load /Unix kern
Page 198 and 199: Unix Administration for (i=0; i&i d
Page 200 and 201: Unix Administration fi done echo $s
Page 202 and 203: Unix Administration New Software !
Page 204 and 205: Unix Security Example: group name:g
Page 206 and 207: Unix Security $ crypt < exam320.Z >
Page 208 and 209: Unix Security - exported filesystem
Page 210 and 211: Unix Security system(cmdstr); $ ech
Page 212:
Unix Security - repairs damaged use
show all

Working with the Unix OS

Create successful ePaper yourself

Delete template?

Save as template?