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1 -1 I NTRODUCTION 1. Wht is posix stndrd? Explin different subset of posix stndrd. Write structure of progrm to filter out non- p osix complint codes from user progrm. ( 06 mrks) ( Dec- 2010). 2. W rite progrm c or c++ posix complement p rogrm to check following limits: i )number of clock ticks i i)mximum number of child processes i ii)mximum pth length i v)mximum number of chrcters in file nme v )Mximum number of open files per process. ( 08 mrks) ( D ec 2009/My 2012) 3. E xplin common chrcteristics of API nd describe error sttus codes ( 06 mrks) ( M y 2009/My 2012) 4. Bring out importnce of stndrdizing UNIX OS. Wht spects of c progrmming l nguge hve been stndrdized in ANSI c? With suitble exmple bring out two importnt difference b/n K&R C nd ANSIC with respect to function prototyping nd p ointers to function. ( 08 mrks) ( Dec- 09/My ) 5. W rite c++ progrm to list ctul vlues of following system configurtion limits o n given unix OS. i ) mximum no. of child processes tht cn be creted. i i) mximum no. of files tht cn be opened simultneously. i i)mximum no. of messge queues tht cn be ccessed. ( 06 mrks) ( Dec-10/My- 12. ) 6. L ist differences between ANSI C nd K & R C. ( 05 mrks) 7. ( My-06/Dec-06/My-08/Dec- 09. ) E xplin ny five e rror sttus code for error no. (05 mrks) ( Dec-1 0). Pge 1

2 - 2 U NIX FILES 1. Explin different file types vilble in UNIX or P OSIX s ystem. ( 08 mrks) ( My-08/Dec-08/My-10/My- 12) 2. Wht is n API? How is it different from c librry functions? Why clling n API is more t ime consuming n clling n user functi on. (06 mrks) ( My-07/Dec- 08) 3. D escribe UNIX Kernel support for files. (06 mrks) ( My-07/Dec-08/My- 12) 4. Wht re APIs? When do you use m? Why re APIs more time consuming thn l ibrry f unction? ( 03 mrks) ( My-06/Dec-06/My-07/Dec- 08) 5. W ht re API common chrcteristics? List ny four vlues of globl vrible errno long with ir mening wherever APIs fil.(05 mrks) ( My- 05) 6. List ll file ttributes long with ir menings. Which of se ttributes cn t be chnged nd why? List commnds needed to chnge following file ttributes. i) file s ize; ii) User ID; iii) Lst ccess n d modifiction time; iv) hrd link count. (05mrks) ( My-06/Dec- 08) 7. Wht is n inode? Why re inodes unique only within file system? How does OS mp t he inode to its filenme? Bring out four importnt differences between l inks. ( 07 mrks) ( My-08/Dec-09/My- 12) 8. W ht re different ctegories of file types vilble with UNIX? Explin. Give some c ommnds to crete ech of m. ( 10 mrks) ( My-10/Dec- 11) soft nd hrd Pge 2

3 - 3 U NIX File APIs 1. List nd explin ccess mode flgs nd ccess modifier flgs. Also explin how 2. t he permission vlue specified in n open cll is modified by its clling process umsk vlue. (04 mrks) ( My-08/My-09/Dec-10/My- 12) E xplin how fcntl API is used for file nd record locking. (08 mrks) ( My- 06) 3. L ist structure used to query file ttributes in Unix. Write progrm in c++ to list rgument following file ttributes of given regulr file pssed s commnd i) file type ii)hrd link count iii)file size iv)file nme.(08 mrks) ( My - 06) 4. D escribe open API, declrtion, vlues clerly its rguments prototype tke declrtion long with indicting ir its mening. line prototype Give instnces when open API cn fil. List ll ccess modifier flgs nd explin ir m enings. ( 06 mrks) ( Dec-06/My- 08) 5. List importnt uses of fcnt API. Give its prototype description. Write c+ + p rogrm to s et, check wher close o n exec flg is set for given file. If it is not use fcntl to set this flg. Also show implementtion of dups mcro using this A PI. (06 mrks) ( My- 08) 6. W rite progrm to implement ls l commnd ( 10 mrks) ( My- 10) two Pge 3

4 - 4 U NIX PROCESSES 1. W rite n explntory note on environment vribles. Also write C/C++ progrm tht o utputs contents of its environment list. (06 mrks) ( Dec- 06) 2. W ith n exmple explin use of setjmp nd longjmp functions. (8 m rks) ( My- 07) 3. D escribe UNIX Kernel s upport for process. Show relted dt structures I n ( 06 mrks) ( My- 12) Bring out importnce of locking files. Wht is drwbck of dvisory lock? E xplin in brief. ( 05 mrks) ( Dec-08/My- 09) certin ppliction,it is required to lock htched portion of file s shown in fig.4(b). before locking progrm must query OS to see if some or process h s locked file. If yes, give detils of locked portion nd PID of process.once lock is obtined perform write nd unlock file. Write c++ progrm to implement this ppliction. Assume suitble lock type.(6 mrks) ( My- 05) 6. Wht re different wys in which process cn terminte? With net block s chemtic, explin how process is lunched nd termintes clerly indicting role of C- s trtup routine nd exit hndlers. (05mrks) ( Dec-06/My- 08) 7. With net digrm, explin memory lyout of c progrm. In which segments re t he u tomtic vribles nd dynmiclly creted objects re stored? (04 mrks) ( My-10/Dec- 11) 8. Wht re setjmp nd longjmp function? Explin with progrm to trnsfer control cross functions using m. ( 10 mrks) ( My- 12) Pge 4

5 1. E xplin following system clls: - 5 P ROCESS CONTROL i )fork ii)vfork iii)exit iv)wit (10 mrks) ( My- 08) 2. G iving prototype e xplin different vrint of exec system cll. ( 10 mrks) 3. W ht is rce condition? Write progrm in C/C++ to illustrte rce condition. ( Dec-05/My- 09) ( 06 mrks) ( Dec- 08) 4. H ow UNIX operting system keeps process ccounting? (06 m rks) ( Dec- 07) 5. Wht is job control? Summrize job control fetures with help of figure. m rks) ( Dec-06/My- 08) (08 6. W ith prototype description of fork, explin specil fetures of this API. Write progrm to crete child process nd print PPID nd PID in child process. The prent process must ensure tht child does not become Zombie process. The prent process m ust wit for child nd print exit sttus of child using ppropr ite mcros. (06 mrks) ( Dec- 09) 7. Explin in brief, wht hppens when exec is clled in child process. List 6 different forms of c ommnd exec APIs. Write progrm tht execs progrm echo ll to disply line nd environment vribles when this progrm is exceed in child process s pce. ( 06 mrks) ( My-09/Dec- 10) 8. With net block schemtic, explin terminl login process in BSD Unix. Wht is session? Explin how do you crete session using pproprite shell commnds. (04 mrks) 9. W ht ll ( My-08/Dec- 09) is job control? Wht re three forms of support from OS required for job c ontrol? ( 04 Mrks) ( Dec- 11) Pge 5

6 - 6 SIGNALS AND DAEMON PR OCESSES 1. Wht is signl? Discuss ny five P OSIX defined signls. Explin how setup signl h ndler. ( 10 mrks) ( My-07/Dec- 09) 2. W ht is demon? Discuss bsic coding rules. (10 mrks) ( My-06/Dec- 08) 3. Wht re signls? Mention different sources of signls. Wht re three d ispositions process hs when signls occur? List ny four signls long with one or two line explntion. Wrtie progrm to setup hndlers for SIGINT nd SIGACARM s ignls. ( 08 mrks) ( My-10/Dec- 11) 4. W ht re demon processes? trnsform norml user process Enlist into ir chrcteristics. demon process. Also Explin write every progrm p rogrm. ( 06 mrks) ( My- 08) step in to Pge 6

7 - 7 INTERPROCESS COMMUNIC ATION 1. W ht re pipes? Wht re ir limittions? Write c progrm tht sends hello world messge to child process through pipe. The child on receiving this m essge should disply it on stndrd output. ( 06 mrks) ( Dec- 05/08) 2. With net block schemtic, explin how FIFO cn be used to implement client- s erver communiction model. ( 04 mrks) ( My- 07) 3. Wht re three different wys in which client nd server processes re cn get ccess to sme IPC structures? List APIs with ir rgument detils tht re used to crete, control, send nd receive messges from messge queue.(7mrks) ( Dec- 08) 4. Wht re semphores? Wht is ir purpose? List nd explin APIs used to crete 5. nd control semphores. (03 mrks) ( My- 07/10) Wht re different system clls vilble to crete nd mnipulte semphores? E xplin. ( 10 mrks) ( Dec-08/My-10/Dec- 11) Pge 7

8 - 8 N ETWORK I PC: SOCKETS 1. W ht is socket? Discuss how it crete nd destroy socket? ( My- 10) 2. Discuss different functions vilble for trnsmitting nd receiving dt over s ocket. ( 10 mrks) ( My-10/Dec- 11) 3. Wht is out-of-bnd dt? Illustrte with exmple, how would you specify out-of- b nd dt. ( 03 mrks) ( Dec- 07) 4. W rite short notes on : i ) rce condition i i) error logging fcility in BSD Unix. ( 09 mrks) ( My- 08/10) 5. W rite progrm to implement popen nd pclose system clls. (10mrks) ( Dec- 09) Pge 8

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