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|00001b20| 6c 6f 63 6b 73 69 7a 65 | 20 3d 20 44 45 46 5f 42 |locksize| = DEF_B|
|00001b30| 4c 4f 43 4b 53 49 5a 45 | 3b 0a 0a 2f 2a 20 4e 75 |LOCKSIZE|;../* Nu|
|00001b40| 6d 62 65 72 73 20 6f 66 | 20 62 6c 6f 63 6b 73 20 |mbers of| blocks |
|00001b50| 69 6e 20 74 68 65 20 71 | 75 65 75 65 2e 20 0a 20 |in the q|ueue. . |
|00001b60| 2a 2f 0a 23 64 65 66 69 | 6e 65 20 4d 41 58 5f 42 |*/.#defi|ne MAX_B|
|00001b70| 4c 4f 43 4b 53 20 32 30 | 34 38 0a 69 6e 74 20 62 |LOCKS 20|48.int b|
|00001b80| 6c 6f 63 6b 73 20 3d 20 | 31 3b 0a 2f 2a 20 43 69 |locks = |1;./* Ci|
|00001b90| 72 63 75 6c 61 72 20 69 | 6e 63 72 65 6d 65 6e 74 |rcular i|ncrement|
|00001ba0| 20 6f 66 20 61 20 62 75 | 66 66 65 72 20 69 6e 64 | of a bu|ffer ind|
|00001bb0| 65 78 20 2a 2f 0a 23 64 | 65 66 69 6e 65 20 49 4e |ex */.#d|efine IN|
|00001bc0| 43 28 69 29 20 28 28 28 | 69 29 2b 31 29 20 3d 3d |C(i) (((|i)+1) ==|
|00001bd0| 20 62 6c 6f 63 6b 73 20 | 3f 20 30 20 3a 20 28 28 | blocks |? 0 : ((|
|00001be0| 69 29 2b 31 29 29 0a 0a | 2f 2a 20 4d 61 78 20 61 |i)+1))..|/* Max a|
|00001bf0| 6d 6d 6f 75 6e 74 20 6f | 66 20 73 68 61 72 65 64 |mmount o|f shared|
|00001c00| 20 6d 65 6d 6f 72 79 20 | 79 6f 75 20 63 61 6e 20 | memory |you can |
|00001c10| 61 6c 6c 6f 63 61 74 65 | 20 2d 20 63 61 6e 27 74 |allocate| - can't|
|00001c20| 20 73 65 65 20 61 20 77 | 61 79 20 74 6f 20 6c 6f | see a w|ay to lo|
|00001c30| 6f 6b 0a 20 2a 20 74 68 | 69 73 20 75 70 2e 0a 20 |ok. * th|is up.. |
|00001c40| 2a 2f 0a 23 64 65 66 69 | 6e 65 20 44 45 46 5f 53 |*/.#defi|ne DEF_S|
|00001c50| 48 4d 45 4d 20 28 31 20 | 4b 20 4b 29 0a 69 6e 74 |HMEM (1 |K K).int|
|00001c60| 20 6d 61 78 5f 73 68 6d | 65 6d 20 3d 20 44 45 46 | max_shm|em = DEF|
|00001c70| 5f 53 48 4d 45 4d 3b 0a | 0a 2f 2a 20 4a 75 73 74 |_SHMEM;.|./* Just|
|00001c80| 20 61 20 66 6c 61 67 20 | 74 6f 20 73 68 6f 77 20 | a flag |to show |
|00001c90| 75 6e 66 69 6c 6c 65 64 | 20 2a 2f 0a 23 64 65 66 |unfilled| */.#def|
|00001ca0| 69 6e 65 20 4e 4f 4e 45 | 20 28 2d 31 29 0a 0a 2f |ine NONE| (-1)../|
|00001cb0| 2a 20 74 68 65 20 73 68 | 61 72 65 64 20 6d 65 6d |* the sh|ared mem|
|00001cc0| 6f 72 79 20 69 64 20 6f | 66 20 74 68 65 20 62 75 |ory id o|f the bu|
|00001cd0| 66 66 65 72 20 2a 2f 0a | 69 6e 74 20 62 75 66 66 |ffer */.|int buff|
|00001ce0| 65 72 5f 69 64 20 3d 20 | 4e 4f 4e 45 3b 0a 73 74 |er_id = |NONE;.st|
|00001cf0| 72 75 63 74 20 62 6c 6f | 63 6b 20 7b 0a 09 69 6e |ruct blo|ck {..in|
|00001d00| 74 20 62 79 74 65 73 3b | 0a 09 63 68 61 72 20 2a |t bytes;|..char *|
|00001d10| 64 61 74 61 3b 0a 7d 20 | 2a 63 75 72 72 5f 62 6c |data;.} |*curr_bl|
|00001d20| 6f 63 6b 3b 0a 0a 23 64 | 65 66 69 6e 65 20 4e 4f |ock;..#d|efine NO|
|00001d30| 5f 42 55 46 46 45 52 20 | 28 28 73 74 72 75 63 74 |_BUFFER |((struct|
|00001d40| 20 62 75 66 66 65 72 20 | 2a 29 2d 31 29 0a 73 74 | buffer |*)-1).st|
|00001d50| 72 75 63 74 20 62 75 66 | 66 65 72 20 7b 0a 09 2f |ruct buf|fer {../|
|00001d60| 2a 20 77 72 69 74 65 72 | 20 77 69 6c 6c 20 68 61 |* writer| will ha|
|00001d70| 6e 67 20 74 72 79 69 6e | 67 20 74 6f 20 6c 6f 63 |ng tryin|g to loc|
|00001d80| 6b 20 74 68 69 73 20 74 | 69 6c 6c 20 72 65 61 64 |k this t|ill read|
|00001d90| 65 72 20 66 69 6c 6c 73 | 20 69 6e 20 61 20 62 6c |er fills| in a bl|
|00001da0| 6f 63 6b 20 2a 2f 0a 09 | 69 6e 74 20 62 6c 6f 63 |ock */..|int bloc|
|00001db0| 6b 73 5f 75 73 65 64 5f | 6c 6f 63 6b 3b 0a 09 2f |ks_used_|lock;../|
|00001dc0| 2a 20 72 65 61 64 65 72 | 20 77 69 6c 6c 20 68 61 |* reader| will ha|
|00001dd0| 6e 67 20 74 72 79 69 6e | 67 20 74 6f 20 6c 6f 63 |ng tryin|g to loc|
|00001de0| 6b 20 74 68 69 73 20 74 | 69 6c 6c 20 77 72 69 74 |k this t|ill writ|
|00001df0| 65 72 20 65 6d 70 74 69 | 65 73 20 61 20 62 6c 6f |er empti|es a blo|
|00001e00| 63 6b 20 2a 2f 0a 09 69 | 6e 74 20 62 6c 6f 63 6b |ck */..i|nt block|
|00001e10| 73 5f 66 72 65 65 5f 6c | 6f 63 6b 3b 0a 0a 09 69 |s_free_l|ock;...i|
|00001e20| 6e 74 20 6e 65 78 74 5f | 62 6c 6f 63 6b 5f 69 6e |nt next_|block_in|
|00001e30| 3b 0a 09 69 6e 74 20 6e | 65 78 74 5f 62 6c 6f 63 |;..int n|ext_bloc|
|00001e40| 6b 5f 6f 75 74 3b 0a 0a | 09 73 74 72 75 63 74 20 |k_out;..|.struct |
|00001e50| 62 6c 6f 63 6b 20 62 6c | 6f 63 6b 5b 20 4d 41 58 |block bl|ock[ MAX|
|00001e60| 5f 42 4c 4f 43 4b 53 20 | 5d 3b 0a 0a 09 2f 2a 20 |_BLOCKS |];.../* |
|00001e70| 54 68 65 73 65 20 61 63 | 74 75 61 6c 20 73 70 61 |These ac|tual spa|
|00001e80| 63 65 20 66 6f 72 20 74 | 68 65 20 62 6c 6f 63 6b |ce for t|he block|
|00001e90| 73 20 69 73 20 68 65 72 | 65 20 2d 20 74 68 65 20 |s is her|e - the |
|00001ea0| 61 72 72 61 79 20 65 78 | 74 65 6e 64 73 0a 09 20 |array ex|tends.. |
|00001eb0| 2a 20 70 61 73 73 20 31 | 20 2a 2f 0a 09 63 68 61 |* pass 1| */..cha|
|00001ec0| 72 20 64 61 74 61 5f 73 | 70 61 63 65 5b 20 31 20 |r data_s|pace[ 1 |
|00001ed0| 5d 3b 0a 7d 20 2a 70 62 | 75 66 66 65 72 20 3d 20 |];.} *pb|uffer = |
|00001ee0| 4e 4f 5f 42 55 46 46 45 | 52 3b 0a 69 6e 74 20 62 |NO_BUFFE|R;.int b|
|00001ef0| 75 66 66 65 72 5f 73 69 | 7a 65 3b 0a 0a 69 6e 74 |uffer_si|ze;..int|
|00001f00| 20 77 72 69 74 65 72 5f | 70 69 64 20 3d 20 30 3b | writer_|pid = 0;|
|00001f10| 0a 69 6e 74 20 64 65 62 | 75 67 20 3d 20 30 3b 0a |.int deb|ug = 0;.|
|00001f20| 63 68 61 72 20 2a 70 72 | 6f 67 6e 61 6d 65 20 3d |char *pr|ogname =|
|00001f30| 20 22 62 75 66 66 65 72 | 22 3b 0a 0a 6d 61 69 6e | "buffer|";..main|
|00001f40| 28 20 61 72 67 63 2c 20 | 61 72 67 76 20 29 0a 09 |( argc, |argv )..|
|00001f50| 69 6e 74 20 61 72 67 63 | 3b 0a 09 63 68 61 72 20 |int argc|;..char |
|00001f60| 2a 2a 61 72 67 76 3b 0a | 7b 0a 09 70 61 72 73 65 |**argv;.|{..parse|
|00001f70| 5f 61 72 67 73 28 20 61 | 72 67 63 2c 20 61 72 67 |_args( a|rgc, arg|
|00001f80| 76 20 29 3b 0a 0a 09 73 | 65 74 5f 68 61 6e 64 6c |v );...s|et_handl|
|00001f90| 65 72 73 28 29 3b 0a 0a | 09 62 75 66 66 65 72 5f |ers();..|.buffer_|
|00001fa0| 61 6c 6c 6f 63 61 74 65 | 28 29 3b 0a 0a 09 73 74 |allocate|();...st|
|00001fb0| 61 72 74 5f 72 65 61 64 | 65 72 5f 61 6e 64 5f 77 |art_read|er_and_w|
|00001fc0| 72 69 74 65 72 28 29 3b | 0a 0a 09 62 79 65 65 28 |riter();|...byee(|
|00001fd0| 20 30 20 29 3b 0a 7d 0a | 0a 70 61 72 73 65 5f 61 | 0 );.}.|.parse_a|
|00001fe0| 72 67 73 28 20 61 72 67 | 63 2c 20 61 72 67 76 20 |rgs( arg|c, argv |
|00001ff0| 29 0a 09 69 6e 74 20 61 | 72 67 63 3b 0a 09 63 68 |)..int a|rgc;..ch|
|00002000| 61 72 20 2a 2a 61 72 67 | 76 3b 0a 7b 0a 09 69 6e |ar **arg|v;.{..in|
|00002010| 74 20 63 3b 0a 09 65 78 | 74 65 72 6e 20 63 68 61 |t c;..ex|tern cha|
|00002020| 72 20 2a 6f 70 74 61 72 | 67 3b 0a 09 65 78 74 65 |r *optar|g;..exte|
|00002030| 72 6e 20 69 6e 74 20 6f | 70 74 69 6e 64 3b 0a 09 |rn int o|ptind;..|
|00002040| 63 68 61 72 20 62 6c 6f | 63 6b 73 5f 67 69 76 65 |char blo|cks_give|
|00002050| 6e 20 3d 20 46 41 4c 53 | 45 3b 0a 0a 09 77 68 69 |n = FALS|E;...whi|
|00002060| 6c 65 28 20 28 63 20 3d | 20 67 65 74 6f 70 74 28 |le( (c =| getopt(|
|00002070| 20 61 72 67 63 2c 20 61 | 72 67 76 2c 20 22 53 3a | argc, a|rgv, "S:|
|00002080| 64 6d 3a 73 3a 62 3a 22 | 20 29 29 20 21 3d 20 2d |dm:s:b:"| )) != -|
|00002090| 31 20 29 7b 0a 09 09 73 | 77 69 74 63 68 28 20 63 |1 ){...s|witch( c|
|000020a0| 20 29 7b 0a 09 09 63 61 | 73 65 20 27 53 27 3a 0a | ){...ca|se 'S':.|
|000020b0| 09 09 09 2f 2a 20 53 68 | 6f 77 20 65 76 65 72 79 |.../* Sh|ow every|
|000020c0| 20 6f 6e 63 65 20 69 6e | 20 61 20 77 68 69 6c 65 | once in| a while|
|000020d0| 20 68 6f 77 20 6d 75 63 | 68 20 69 73 20 70 72 69 | how muc|h is pri|
|000020e0| 6e 74 65 64 20 2a 2f 0a | 09 09 09 73 68 6f 77 65 |nted */.|...showe|
|000020f0| 76 65 72 79 20 3d 20 64 | 6f 5f 73 69 7a 65 28 20 |very = d|o_size( |
|00002100| 6f 70 74 61 72 67 20 29 | 3b 0a 09 09 09 69 66 28 |optarg )|;....if(|
|00002110| 20 73 68 6f 77 65 76 65 | 72 79 20 3c 3d 20 30 20 | showeve|ry <= 0 |
|00002120| 29 0a 09 09 09 09 73 68 | 6f 77 65 76 65 72 79 20 |).....sh|owevery |
|00002130| 3d 20 50 52 49 4e 54 5f | 45 56 45 52 59 3b 0a 09 |= PRINT_|EVERY;..|
|00002140| 09 09 62 72 65 61 6b 3b | 0a 09 09 63 61 73 65 20 |..break;|...case |
|00002150| 27 64 27 3a 09 2f 2a 20 | 64 65 62 75 67 20 2a 2f |'d':./* |debug */|
|00002160| 0a 09 09 09 64 65 62 75 | 67 20 3d 20 31 3b 0a 09 |....debu|g = 1;..|
|00002170| 09 09 73 65 74 62 75 66 | 28 20 73 74 64 6f 75 74 |..setbuf|( stdout|
|00002180| 2c 20 4e 55 4c 4c 20 29 | 3b 0a 09 09 09 73 65 74 |, NULL )|;....set|
|00002190| 62 75 66 28 20 73 74 64 | 65 72 72 2c 20 4e 55 4c |buf( std|err, NUL|
|000021a0| 4c 20 29 3b 0a 09 09 09 | 66 70 72 69 6e 74 66 28 |L );....|fprintf(|
|000021b0| 20 73 74 64 65 72 72 2c | 20 22 64 65 62 75 67 67 | stderr,| "debugg|
|000021c0| 69 6e 67 20 74 75 72 6e | 65 64 20 6f 6e 5c 6e 22 |ing turn|ed on\n"|
|000021d0| 20 29 3b 0a 09 09 09 62 | 72 65 61 6b 3b 0a 09 09 | );....b|reak;...|
|000021e0| 63 61 73 65 20 27 6d 27 | 3a 0a 09 09 09 2f 2a 20 |case 'm'|:..../* |
|000021f0| 4d 61 78 20 73 69 7a 65 | 20 6f 66 20 73 68 61 72 |Max size| of shar|
|00002200| 65 64 20 6d 65 6d 6f 72 | 79 20 6c 75 6d 70 20 2a |ed memor|y lump *|
|00002210| 2f 0a 09 09 09 6d 61 78 | 5f 73 68 6d 65 6d 20 3d |/....max|_shmem =|
|00002220| 20 64 6f 5f 73 69 7a 65 | 28 20 6f 70 74 61 72 67 | do_size|( optarg|
|00002230| 20 29 3b 0a 0a 09 09 09 | 69 66 28 20 6d 61 78 5f | );.....|if( max_|
|00002240| 73 68 6d 65 6d 20 3c 20 | 28 73 69 7a 65 6f 66 28 |shmem < |(sizeof(|
|00002250| 20 73 74 72 75 63 74 20 | 62 75 66 66 65 72 20 29 | struct |buffer )|
|00002260| 20 2b 20 28 62 6c 6f 63 | 6b 73 69 7a 65 20 2a 20 | + (bloc|ksize * |
|00002270| 62 6c 6f 63 6b 73 29 29 | 20 29 7b 0a 09 09 09 09 |blocks))| ){.....|
|00002280| 66 70 72 69 6e 74 66 28 | 20 73 74 64 65 72 72 2c |fprintf(| stderr,|
|00002290| 20 22 6d 61 78 5f 73 68 | 6d 65 6d 20 25 64 20 74 | "max_sh|mem %d t|
|000022a0| 6f 6f 20 6c 6f 77 5c 6e | 22 2c 20 6d 61 78 5f 73 |oo low\n|", max_s|
|000022b0| 68 6d 65 6d 20 29 3b 0a | 09 09 09 09 62 79 65 65 |hmem );.|....byee|
|000022c0| 28 20 2d 31 20 29 3b 0a | 09 09 09 7d 0a 09 09 09 |( -1 );.|...}....|
|000022d0| 62 72 65 61 6b 3b 0a 09 | 09 63 61 73 65 20 27 62 |break;..|.case 'b|
|000022e0| 27 3a 0a 09 09 09 2f 2a | 20 4e 75 6d 62 65 72 20 |':..../*| Number |
|000022f0| 6f 66 20 62 6c 6f 63 6b | 73 20 2a 2f 0a 09 09 09 |of block|s */....|
|00002300| 62 6c 6f 63 6b 73 5f 67 | 69 76 65 6e 20 3d 20 54 |blocks_g|iven = T|
|00002310| 52 55 45 3b 0a 09 09 09 | 62 6c 6f 63 6b 73 20 3d |RUE;....|blocks =|
|00002320| 20 61 74 6f 69 28 20 6f | 70 74 61 72 67 20 29 3b | atoi( o|ptarg );|
|00002330| 0a 09 09 09 69 66 28 20 | 28 62 6c 6f 63 6b 73 20 |....if( |(blocks |
|00002340| 3c 3d 20 30 29 20 7c 7c | 20 28 4d 41 58 5f 42 4c |<= 0) ||| (MAX_BL|
|00002350| 4f 43 4b 53 20 3c 20 62 | 6c 6f 63 6b 73 29 20 29 |OCKS < b|locks) )|
|00002360| 7b 0a 09 09 09 09 66 70 | 72 69 6e 74 66 28 20 73 |{.....fp|rintf( s|
|00002370| 74 64 65 72 72 2c 20 22 | 62 6c 6f 63 6b 73 20 25 |tderr, "|blocks %|
|00002380| 64 20 6f 75 74 20 6f 66 | 20 72 61 6e 67 65 5c 6e |d out of| range\n|
|00002390| 22 2c 20 62 6c 6f 63 6b | 73 20 29 3b 0a 09 09 09 |", block|s );....|
|000023a0| 09 62 79 65 65 28 20 2d | 31 20 29 3b 0a 09 09 09 |.byee( -|1 );....|
|000023b0| 7d 0a 09 09 09 62 72 65 | 61 6b 3b 0a 09 09 63 61 |}....bre|ak;...ca|
|000023c0| 73 65 20 27 73 27 3a 09 | 2f 2a 20 53 69 7a 65 20 |se 's':.|/* Size |
|000023d0| 6f 66 20 61 20 62 6c 6f | 63 6b 20 2a 2f 0a 09 09 |of a blo|ck */...|
|000023e0| 09 62 6c 6f 63 6b 73 69 | 7a 65 20 3d 20 64 6f 5f |.blocksi|ze = do_|
|000023f0| 73 69 7a 65 28 20 6f 70 | 74 61 72 67 20 29 3b 0a |size( op|targ );.|
|00002400| 0a 09 09 09 69 66 28 20 | 28 62 6c 6f 63 6b 73 69 |....if( |(blocksi|
|00002410| 7a 65 20 3c 3d 20 30 29 | 20 7c 7c 20 28 4d 41 58 |ze <= 0)| || (MAX|
|00002420| 5f 42 4c 4f 43 4b 53 49 | 5a 45 20 3c 20 62 6c 6f |_BLOCKSI|ZE < blo|
|00002430| 63 6b 73 69 7a 65 29 20 | 29 7b 0a 09 09 09 09 66 |cksize) |){.....f|
|00002440| 70 72 69 6e 74 66 28 20 | 73 74 64 65 72 72 2c 20 |printf( |stderr, |
|00002450| 22 62 6c 6f 63 6b 73 69 | 7a 65 20 25 64 20 6f 75 |"blocksi|ze %d ou|
|00002460| 74 20 6f 66 20 72 61 6e | 67 65 5c 6e 22 2c 20 62 |t of ran|ge\n", b|
|00002470| 6c 6f 63 6b 73 69 7a 65 | 20 29 3b 0a 09 09 09 09 |locksize| );.....|
|00002480| 62 79 65 65 28 20 2d 31 | 20 29 3b 0a 09 09 09 7d |byee( -1| );....}|
|00002490| 0a 09 09 09 62 72 65 61 | 6b 3b 0a 09 09 64 65 66 |....brea|k;...def|
|000024a0| 61 75 6c 74 3a 0a 09 09 | 09 66 70 72 69 6e 74 66 |ault:...|.fprintf|
|000024b0| 28 20 73 74 64 65 72 72 | 2c 20 22 55 73 61 67 65 |( stderr|, "Usage|
|000024c0| 3a 20 25 73 20 5b 2d 53 | 20 73 69 7a 65 5d 20 5b |: %s [-S| size] [|
|000024d0| 2d 6d 20 6d 65 6d 73 69 | 7a 65 5d 20 5b 2d 62 20 |-m memsi|ze] [-b |
|000024e0| 62 6c 6f 63 6b 73 5d 20 | 5b 2d 73 20 62 6c 6f 63 |blocks] |[-s bloc|
|000024f0| 6b 73 69 7a 65 5d 5c 6e | 22 2c 0a 09 09 09 09 70 |ksize]\n|",.....p|
|00002500| 72 6f 67 6e 61 6d 65 20 | 29 3b 0a 09 09 09 66 70 |rogname |);....fp|
|00002510| 72 69 6e 74 66 28 20 73 | 74 64 65 72 72 2c 20 22 |rintf( s|tderr, "|
|00002520| 2d 53 20 3d 20 73 68 6f | 77 20 61 6d 6d 6f 75 6e |-S = sho|w ammoun|
|00002530| 74 20 77 72 69 74 65 6e | 20 65 76 65 72 79 20 73 |t writen| every s|
|00002540| 69 7a 65 20 62 79 74 65 | 73 5c 6e 22 20 29 3b 0a |ize byte|s\n" );.|
|00002550| 09 09 09 66 70 72 69 6e | 74 66 28 20 73 74 64 65 |...fprin|tf( stde|
|00002560| 72 72 2c 20 22 2d 6d 20 | 3d 20 73 69 7a 65 20 6f |rr, "-m |= size o|
|00002570| 66 20 73 68 61 72 65 64 | 20 6d 65 6d 20 63 68 75 |f shared| mem chu|
|00002580| 6e 6b 20 74 6f 20 67 72 | 61 62 5c 6e 22 20 29 3b |nk to gr|ab\n" );|
|00002590| 0a 09 09 09 66 70 72 69 | 6e 74 66 28 20 73 74 64 |....fpri|ntf( std|
|000025a0| 65 72 72 2c 20 22 2d 62 | 20 3d 20 6e 75 6d 62 65 |err, "-b| = numbe|
|000025b0| 72 20 6f 66 20 62 6c 6f | 63 6b 73 20 69 6e 20 71 |r of blo|cks in q|
|000025c0| 75 65 75 65 5c 6e 22 20 | 29 3b 0a 09 09 09 66 70 |ueue\n" |);....fp|
|000025d0| 72 69 6e 74 66 28 20 73 | 74 64 65 72 72 2c 20 22 |rintf( s|tderr, "|
|000025e0| 2d 73 20 3d 20 73 69 7a | 65 20 6f 66 20 61 20 62 |-s = siz|e of a b|
|000025f0| 6c 6f 63 6b 5c 6e 22 20 | 29 3b 0a 09 09 09 62 79 |lock\n" |);....by|
|00002600| 65 65 28 20 2d 31 20 29 | 3b 0a 09 09 7d 0a 09 7d |ee( -1 )|;...}..}|
|00002610| 0a 0a 09 2f 2a 20 49 66 | 20 2d 62 20 77 61 73 20 |.../* If| -b was |
|00002620| 6e 6f 74 20 67 69 76 65 | 6e 20 74 72 79 20 61 6e |not give|n try an|
|00002630| 64 20 77 6f 72 6b 20 6f | 75 74 20 74 68 65 20 6d |d work o|ut the m|
|00002640| 61 78 20 62 75 66 66 65 | 72 20 73 69 7a 65 20 2a |ax buffe|r size *|
|00002650| 2f 0a 09 69 66 28 20 21 | 62 6c 6f 63 6b 73 5f 67 |/..if( !|blocks_g|
|00002660| 69 76 65 6e 20 29 7b 0a | 09 09 62 6c 6f 63 6b 73 |iven ){.|..blocks|
|00002670| 20 3d 20 28 6d 61 78 5f | 73 68 6d 65 6d 20 2d 20 | = (max_|shmem - |
|00002680| 73 69 7a 65 6f 66 28 20 | 73 74 72 75 63 74 20 62 |sizeof( |struct b|
|00002690| 75 66 66 65 72 20 29 29 | 20 2f 20 62 6c 6f 63 6b |uffer ))| / block|
|000026a0| 73 69 7a 65 3b 0a 09 09 | 69 66 28 20 62 6c 6f 63 |size;...|if( bloc|
|000026b0| 6b 73 20 3c 3d 20 30 20 | 29 7b 0a 09 09 09 66 70 |ks <= 0 |){....fp|
|000026c0| 72 69 6e 74 66 28 20 73 | 74 64 65 72 72 2c 20 22 |rintf( s|tderr, "|
|000026d0| 43 61 6e 6e 6f 74 20 68 | 61 6e 64 6c 65 20 62 6c |Cannot h|andle bl|
|000026e0| 6f 63 6b 73 20 74 68 61 | 74 20 62 69 67 2c 20 61 |ocks tha|t big, a|
|000026f0| 62 6f 72 74 69 6e 67 21 | 5c 6e 22 20 29 3b 0a 09 |borting!|\n" );..|
|00002700| 09 09 62 79 65 65 28 20 | 2d 31 20 29 3b 0a 09 09 |..byee( |-1 );...|
|00002710| 7d 0a 09 09 69 66 28 20 | 4d 41 58 5f 42 4c 4f 43 |}...if( |MAX_BLOC|
|00002720| 4b 53 20 3c 20 62 6c 6f | 63 6b 73 20 20 29 7b 0a |KS < blo|cks  ){.|
|00002730| 09 09 09 66 70 72 69 6e | 74 66 28 20 73 74 64 65 |...fprin|tf( stde|
|00002740| 72 72 2c 20 22 43 61 6e | 6e 6f 74 20 68 61 6e 64 |rr, "Can|not hand|
|00002750| 6c 65 20 74 68 61 74 20 | 6d 61 6e 79 20 62 6c 6f |le that |many blo|
|00002760| 63 6b 73 2c 20 61 62 6f | 72 74 69 6e 67 21 5c 6e |cks, abo|rting!\n|
|00002770| 22 20 29 3b 0a 09 09 09 | 62 79 65 65 28 20 2d 31 |" );....|byee( -1|
|00002780| 20 29 3b 0a 09 09 7d 0a | 09 7d 0a 7d 0a 0a 2f 2a | );...}.|.}.}../*|
|00002790| 20 54 68 65 20 69 6e 74 | 65 72 72 75 70 74 20 68 | The int|errupt h|
|000027a0| 61 6e 64 6c 65 72 20 2a | 2f 0a 73 68 75 74 64 6f |andler *|/.shutdo|
|000027b0| 77 6e 28 29 0a 7b 0a 09 | 62 79 65 65 28 20 2d 31 |wn().{..|byee( -1|
|000027c0| 20 29 3b 0a 7d 0a 0a 73 | 65 74 5f 68 61 6e 64 6c | );.}..s|et_handl|
|000027d0| 65 72 73 28 29 0a 7b 0a | 09 73 69 67 6e 61 6c 28 |ers().{.|.signal(|
|000027e0| 20 53 49 47 48 55 50 2c | 20 73 68 75 74 64 6f 77 | SIGHUP,| shutdow|
|000027f0| 6e 20 29 3b 0a 09 73 69 | 67 6e 61 6c 28 20 53 49 |n );..si|gnal( SI|
|00002800| 47 49 4e 54 2c 20 73 68 | 75 74 64 6f 77 6e 20 29 |GINT, sh|utdown )|
|00002810| 3b 0a 09 73 69 67 6e 61 | 6c 28 20 53 49 47 51 55 |;..signa|l( SIGQU|
|00002820| 49 54 2c 20 73 68 75 74 | 64 6f 77 6e 20 29 3b 0a |IT, shut|down );.|
|00002830| 09 73 69 67 6e 61 6c 28 | 20 53 49 47 54 45 52 4d |.signal(| SIGTERM|
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|000035a0| 79 74 65 73 20 3c 20 30 | 20 29 7b 0a 09 09 70 65 |ytes < 0| ){...pe|
|000035b0| 72 72 6f 72 28 20 22 66 | 61 69 6c 65 64 20 74 6f |rror( "f|ailed to|
|000035c0| 20 72 65 61 64 20 69 6e | 70 75 74 22 20 29 3b 0a | read in|put" );.|
|000035d0| 09 09 62 79 65 65 28 20 | 2d 31 20 29 3b 0a 09 7d |..byee( |-1 );..}|
|000035e0| 0a 0a 09 2f 2a 20 6e 75 | 6d 62 65 72 20 6f 66 20 |.../* nu|mber of |
|000035f0| 62 79 74 65 73 20 61 76 | 61 69 6c 61 62 6c 65 2e |bytes av|ailable.|
|00003600| 20 5a 65 72 6f 20 77 69 | 6c 6c 20 62 65 20 74 61 | Zero wi|ll be ta|
|00003610| 6b 65 6e 20 61 73 20 65 | 6f 66 20 2a 2f 0a 09 63 |ken as e|of */..c|
|00003620| 75 72 72 5f 62 6c 6f 63 | 6b 2d 3e 62 79 74 65 73 |urr_bloc|k->bytes|
|00003630| 20 3d 20 62 6c 6f 63 6b | 73 69 7a 65 20 2d 20 74 | = block|size - t|
|00003640| 6f 72 65 61 64 3b 0a 0a | 09 69 66 28 20 64 65 62 |oread;..|.if( deb|
|00003650| 75 67 20 29 0a 09 09 66 | 70 72 69 6e 74 66 28 20 |ug )...f|printf( |
|00003660| 73 74 64 65 72 72 2c 20 | 22 67 6f 74 20 25 64 20 |stderr, |"got %d |
|00003670| 62 79 74 65 73 5c 6e 22 | 2c 20 63 75 72 72 5f 62 |bytes\n"|, curr_b|
|00003680| 6c 6f 63 6b 2d 3e 62 79 | 74 65 73 20 29 3b 0a 0a |lock->by|tes );..|
|00003690| 09 75 6e 6c 6f 63 6b 28 | 20 70 62 75 66 66 65 72 |.unlock(| pbuffer|
|000036a0| 2d 3e 62 6c 6f 63 6b 73 | 5f 75 73 65 64 5f 6c 6f |->blocks|_used_lo|
|000036b0| 63 6b 20 29 3b 0a 0a 09 | 72 65 74 75 72 6e 20 63 |ck );...|return c|
|000036c0| 75 72 72 5f 62 6c 6f 63 | 6b 2d 3e 62 79 74 65 73 |urr_bloc|k->bytes|
|000036d0| 3b 0a 7d 0a 0a 0a 2f 2a | 20 57 72 69 74 65 20 74 |;.}.../*| Write t|
|000036e0| 68 65 20 62 75 66 66 65 | 72 20 74 6f 20 73 74 64 |he buffe|r to std|
|000036f0| 6f 75 74 20 2a 2f 0a 77 | 72 69 74 65 72 28 29 0a |out */.w|riter().|
|00003700| 7b 0a 09 69 66 28 20 64 | 65 62 75 67 20 29 0a 09 |{..if( d|ebug )..|
|00003710| 09 66 70 72 69 6e 74 66 | 28 20 73 74 64 65 72 72 |.fprintf|( stderr|
|00003720| 2c 20 22 5c 74 45 6e 74 | 65 72 69 6e 67 20 77 72 |, "\tEnt|ering wr|
|00003730| 69 74 65 72 5c 6e 22 20 | 29 3b 0a 0a 09 67 65 74 |iter\n" |);...get|
|00003740| 5f 62 75 66 66 65 72 28 | 29 3b 0a 0a 09 77 68 69 |_buffer(|);...whi|
|00003750| 6c 65 28 20 31 20 29 7b | 0a 09 09 67 65 74 5f 6e |le( 1 ){|...get_n|
|00003760| 65 78 74 5f 66 69 6c 6c | 65 64 5f 62 6c 6f 63 6b |ext_fill|ed_block|
|00003770| 28 29 3b 0a 09 09 69 66 | 28 20 21 64 61 74 61 5f |();...if|( !data_|
|00003780| 74 6f 5f 77 72 69 74 65 | 28 29 20 29 0a 09 09 09 |to_write|() )....|
|00003790| 62 72 65 61 6b 3b 0a 09 | 09 77 72 69 74 65 5f 62 |break;..|.write_b|
|000037a0| 6c 6f 63 6b 5f 74 6f 5f | 73 74 64 6f 75 74 28 29 |lock_to_|stdout()|
|000037b0| 3b 0a 09 7d 0a 0a 09 69 | 66 28 20 64 65 62 75 67 |;..}...i|f( debug|
|000037c0| 20 29 0a 09 09 66 70 72 | 69 6e 74 66 28 20 73 74 | )...fpr|intf( st|
|000037d0| 64 65 72 72 2c 20 22 5c | 74 45 78 69 74 69 6e 67 |derr, "\|tExiting|
|000037e0| 20 77 72 69 74 65 72 5c | 6e 22 20 29 3b 0a 7d 0a | writer\|n" );.}.|
|000037f0| 0a 67 65 74 5f 6e 65 78 | 74 5f 66 69 6c 6c 65 64 |.get_nex|t_filled|
|00003800| 5f 62 6c 6f 63 6b 28 29 | 0a 7b 0a 09 2f 2a 20 48 |_block()|.{../* H|
|00003810| 61 6e 67 20 74 69 6c 6c | 20 73 6f 6d 65 20 64 61 |ang till| some da|
|00003820| 74 61 20 69 73 20 61 76 | 61 69 6c 61 62 6c 65 20 |ta is av|ailable |
|00003830| 2a 2f 0a 09 6c 6f 63 6b | 28 20 70 62 75 66 66 65 |*/..lock|( pbuffe|
|00003840| 72 2d 3e 62 6c 6f 63 6b | 73 5f 75 73 65 64 5f 6c |r->block|s_used_l|
|00003850| 6f 63 6b 20 29 3b 0a 0a | 09 63 75 72 72 5f 62 6c |ock );..|.curr_bl|
|00003860| 6f 63 6b 20 3d 20 26 70 | 62 75 66 66 65 72 2d 3e |ock = &p|buffer->|
|00003870| 62 6c 6f 63 6b 5b 20 70 | 62 75 66 66 65 72 2d 3e |block[ p|buffer->|
|00003880| 6e 65 78 74 5f 62 6c 6f | 63 6b 5f 6f 75 74 20 5d |next_blo|ck_out ]|
|00003890| 3b 0a 0a 09 70 62 75 66 | 66 65 72 2d 3e 6e 65 78 |;...pbuf|fer->nex|
|000038a0| 74 5f 62 6c 6f 63 6b 5f | 6f 75 74 20 3d 20 49 4e |t_block_|out = IN|
|000038b0| 43 28 20 70 62 75 66 66 | 65 72 2d 3e 6e 65 78 74 |C( pbuff|er->next|
|000038c0| 5f 62 6c 6f 63 6b 5f 6f | 75 74 20 29 3b 0a 7d 0a |_block_o|ut );.}.|
|000038d0| 0a 64 61 74 61 5f 74 6f | 5f 77 72 69 74 65 28 29 |.data_to|_write()|
|000038e0| 0a 7b 0a 09 72 65 74 75 | 72 6e 20 63 75 72 72 5f |.{..retu|rn curr_|
|000038f0| 62 6c 6f 63 6b 2d 3e 62 | 79 74 65 73 3b 0a 7d 0a |block->b|ytes;.}.|
|00003900| 0a 77 72 69 74 65 5f 62 | 6c 6f 63 6b 5f 74 6f 5f |.write_b|lock_to_|
|00003910| 73 74 64 6f 75 74 28 29 | 0a 7b 0a 09 73 74 61 74 |stdout()|.{..stat|
|00003920| 69 63 20 69 6e 74 20 6f | 75 74 20 3d 20 30 3b 0a |ic int o|ut = 0;.|
|00003930| 09 73 74 61 74 69 63 20 | 69 6e 74 20 6e 65 78 74 |.static |int next|
|00003940| 5f 6b 3b 0a 0a 09 69 66 | 28 20 77 72 69 74 65 28 |_k;...if|( write(|
|00003950| 20 31 2c 20 63 75 72 72 | 5f 62 6c 6f 63 6b 2d 3e | 1, curr|_block->|
|00003960| 64 61 74 61 2c 20 63 75 | 72 72 5f 62 6c 6f 63 6b |data, cu|rr_block|
|00003970| 2d 3e 62 79 74 65 73 20 | 29 20 21 3d 20 63 75 72 |->bytes |) != cur|
|00003980| 72 5f 62 6c 6f 63 6b 2d | 3e 62 79 74 65 73 20 29 |r_block-|>bytes )|
|00003990| 7b 0a 09 09 70 65 72 72 | 6f 72 28 20 22 77 72 69 |{...perr|or( "wri|
|000039a0| 74 65 20 6f 66 20 64 61 | 74 61 20 66 61 69 6c 65 |te of da|ta faile|
|000039b0| 64 22 20 29 3b 0a 09 09 | 62 79 65 65 28 20 2d 31 |d" );...|byee( -1|
|000039c0| 20 29 3b 0a 09 7d 0a 0a | 09 69 66 28 20 73 68 6f | );..}..|.if( sho|
|000039d0| 77 65 76 65 72 79 20 29 | 7b 0a 09 09 6f 75 74 20 |wevery )|{...out |
|000039e0| 2b 3d 20 63 75 72 72 5f | 62 6c 6f 63 6b 2d 3e 62 |+= curr_|block->b|
|000039f0| 79 74 65 73 3b 0a 09 09 | 69 66 28 20 6f 75 74 20 |ytes;...|if( out |
|00003a00| 3e 20 6e 65 78 74 5f 6b | 20 29 7b 0a 09 09 09 66 |> next_k| ){....f|
|00003a10| 70 72 69 6e 74 66 28 20 | 73 74 64 65 72 72 2c 20 |printf( |stderr, |
|00003a20| 22 25 20 38 64 4b 5c 72 | 22 2c 20 6f 75 74 20 2f |"% 8dK\r|", out /|
|00003a30| 20 31 30 32 34 20 29 3b | 0a 09 09 09 6e 65 78 74 | 1024 );|....next|
|00003a40| 5f 6b 20 2b 3d 20 73 68 | 6f 77 65 76 65 72 79 3b |_k += sh|owevery;|
|00003a50| 0a 09 09 7d 0a 09 7d 0a | 0a 09 75 6e 6c 6f 63 6b |...}..}.|..unlock|
|00003a60| 28 20 70 62 75 66 66 65 | 72 2d 3e 62 6c 6f 63 6b |( pbuffe|r->block|
|00003a70| 73 5f 66 72 65 65 5f 6c | 6f 63 6b 20 29 3b 0a 7d |s_free_l|ock );.}|
|00003a80| 0a 0a 0a 76 6f 69 64 0a | 62 79 65 65 28 20 65 78 |...void.|byee( ex|
|00003a90| 69 74 5f 76 61 6c 20 29 | 0a 09 69 6e 74 20 65 78 |it_val )|..int ex|
|00003aa0| 69 74 5f 76 61 6c 3b 0a | 7b 0a 09 2f 2a 20 4f 6e |it_val;.|{../* On|
|00003ab0| 6c 79 20 74 68 65 20 70 | 61 72 65 6e 74 20 28 72 |ly the p|arent (r|
|00003ac0| 65 61 64 65 72 29 20 73 | 68 6f 75 6c 64 20 7a 61 |eader) s|hould za|
|00003ad0| 70 20 74 68 65 20 62 75 | 66 66 65 72 20 2a 2f 0a |p the bu|ffer */.|
|00003ae0| 09 69 66 28 20 77 72 69 | 74 65 72 5f 70 69 64 20 |.if( wri|ter_pid |
|00003af0| 21 3d 20 30 20 29 0a 09 | 09 62 75 66 66 65 72 5f |!= 0 )..|.buffer_|
|00003b00| 72 65 6d 6f 76 65 28 29 | 3b 0a 09 65 6c 73 65 20 |remove()|;..else |
|00003b10| 69 66 28 20 73 68 6f 77 | 65 76 65 72 79 20 29 0a |if( show|every ).|
|00003b20| 09 09 66 70 72 69 6e 74 | 66 28 20 73 74 64 65 72 |..fprint|f( stder|
|00003b30| 72 2c 20 22 5c 6e 22 20 | 29 3b 0a 0a 09 65 78 69 |r, "\n" |);...exi|
|00003b40| 74 28 20 65 78 69 74 5f | 76 61 6c 20 29 3b 0a 7d |t( exit_|val );.}|
|00003b50| 0a 0a 2f 2a 20 47 69 76 | 65 6e 20 61 20 73 74 72 |../* Giv|en a str|
|00003b60| 69 6e 67 20 6f 66 20 3c | 6e 75 6d 3e 5b 3c 73 75 |ing of <|num>[<su|
|00003b70| 66 66 3e 5d 20 72 65 74 | 75 72 6e 73 20 61 20 6e |ff>] ret|urns a n|
|00003b80| 75 6d 0a 20 2a 20 73 75 | 66 66 20 3d 0a 20 2a 20 |um. * su|ff =. * |
|00003b90| 20 20 6d 2f 4d 20 66 6f | 72 20 31 6d 65 67 0a 20 |  m/M fo|r 1meg. |
|00003ba0| 2a 20 20 20 6b 2f 4b 20 | 66 6f 72 20 31 6b 0a 20 |*   k/K |for 1k. |
|00003bb0| 2a 20 20 20 62 2f 42 20 | 66 6f 72 20 35 31 32 0a |*   b/B |for 512.|
|00003bc0| 20 2a 2f 0a 64 6f 5f 73 | 69 7a 65 28 20 61 72 67 | */.do_s|ize( arg|
|00003bd0| 20 29 0a 09 63 68 61 72 | 20 2a 61 72 67 3b 0a 7b | )..char| *arg;.{|
|00003be0| 0a 09 63 68 61 72 20 66 | 6f 72 6d 61 74 5b 20 32 |..char f|ormat[ 2|
|00003bf0| 30 20 5d 3b 0a 09 69 6e | 74 20 72 65 74 3b 0a 0a |0 ];..in|t ret;..|
|00003c00| 09 2a 66 6f 72 6d 61 74 | 20 3d 20 27 5c 30 27 3b |.*format| = '\0';|
|00003c10| 0a 09 73 73 63 61 6e 66 | 28 20 61 72 67 2c 20 22 |..sscanf|( arg, "|
|00003c20| 25 64 25 73 22 2c 20 26 | 72 65 74 2c 20 66 6f 72 |%d%s", &|ret, for|
|00003c30| 6d 61 74 20 29 3b 0a 0a | 09 73 77 69 74 63 68 28 |mat );..|.switch(|
|00003c40| 20 2a 66 6f 72 6d 61 74 | 20 29 7b 0a 09 63 61 73 | *format| ){..cas|
|00003c50| 65 20 27 6d 27 3a 0a 09 | 63 61 73 65 20 27 4d 27 |e 'm':..|case 'M'|
|00003c60| 3a 0a 09 09 72 65 74 20 | 3d 20 72 65 74 20 4b 20 |:...ret |= ret K |
|00003c70| 4b 3b 0a 09 09 62 72 65 | 61 6b 3b 0a 09 63 61 73 |K;...bre|ak;..cas|
|00003c80| 65 20 27 6b 27 3a 0a 09 | 63 61 73 65 20 27 4b 27 |e 'k':..|case 'K'|
|00003c90| 3a 0a 09 09 72 65 74 20 | 3d 20 72 65 74 20 4b 3b |:...ret |= ret K;|
|00003ca0| 0a 09 09 62 72 65 61 6b | 3b 0a 09 63 61 73 65 20 |...break|;..case |
|00003cb0| 27 62 27 3a 0a 09 63 61 | 73 65 20 27 42 27 3a 0a |'b':..ca|se 'B':.|
|00003cc0| 09 09 72 65 74 20 2a 3d | 20 35 31 32 3b 0a 09 09 |..ret *=| 512;...|
|00003cd0| 62 72 65 61 6b 3b 0a 09 | 7d 0a 09 0a 09 72 65 74 |break;..|}....ret|
|00003ce0| 75 72 6e 20 72 65 74 3b | 0a 7d 0a 53 48 41 52 5f |urn ret;|.}.SHAR_|
|00003cf0| 45 4f 46 0a 66 69 20 23 | 20 65 6e 64 20 6f 66 20 |EOF.fi #| end of |
|00003d00| 6f 76 65 72 77 72 69 74 | 69 6e 67 20 63 68 65 63 |overwrit|ing chec|
|00003d10| 6b 0a 69 66 20 74 65 73 | 74 20 2d 66 20 27 73 65 |k.if tes|t -f 'se|
|00003d20| 6d 2e 63 27 0a 74 68 65 | 6e 0a 09 65 63 68 6f 20 |m.c'.the|n..echo |
|00003d30| 73 68 61 72 3a 20 77 69 | 6c 6c 20 6e 6f 74 20 6f |shar: wi|ll not o|
|00003d40| 76 65 72 2d 77 72 69 74 | 65 20 65 78 69 73 74 69 |ver-writ|e existi|
|00003d50| 6e 67 20 66 69 6c 65 20 | 22 27 73 65 6d 2e 63 27 |ng file |"'sem.c'|
|00003d60| 22 0a 65 6c 73 65 0a 63 | 61 74 20 3c 3c 20 5c 53 |".else.c|at << \S|
|00003d70| 48 41 52 5f 45 4f 46 20 | 3e 20 27 73 65 6d 2e 63 |HAR_EOF |> 'sem.c|
|00003d80| 27 0a 2f 2a 20 53 6f 6d | 65 20 73 69 6d 70 6c 65 |'./* Som|e simple|
|00003d90| 20 62 69 6e 61 72 79 20 | 73 65 6d 61 70 68 6f 72 | binary |semaphor|
|00003da0| 65 20 72 6f 75 74 69 6e | 65 73 20 2a 2f 0a 23 69 |e routin|es */.#i|
|00003db0| 6e 63 6c 75 64 65 20 3c | 73 74 64 69 6f 2e 68 3e |nclude <|stdio.h>|
|00003dc0| 0a 23 69 6e 63 6c 75 64 | 65 20 3c 73 79 73 2f 74 |.#includ|e <sys/t|
|00003dd0| 79 70 65 73 2e 68 3e 0a | 23 69 6e 63 6c 75 64 65 |ypes.h>.|#include|
|00003de0| 20 3c 73 79 73 2f 73 74 | 61 74 2e 68 3e 0a 23 69 | <sys/st|at.h>.#i|
|00003df0| 6e 63 6c 75 64 65 20 3c | 73 79 73 2f 69 70 63 2e |nclude <|sys/ipc.|
|00003e00| 68 3e 0a 23 69 6e 63 6c | 75 64 65 20 3c 73 79 73 |h>.#incl|ude <sys|
|00003e10| 2f 73 65 6d 2e 68 3e 0a | 0a 2f 2a 20 53 65 74 20 |/sem.h>.|./* Set |
|00003e20| 61 20 73 65 6d 61 70 68 | 6f 72 65 20 74 6f 20 61 |a semaph|ore to a|
|00003e30| 20 70 61 72 74 69 63 75 | 6c 61 72 20 76 61 6c 75 | particu|lar valu|
|00003e40| 65 20 2d 20 6d 65 61 6e | 74 20 74 6f 20 62 65 20 |e - mean|t to be |
|00003e50| 75 73 65 64 20 62 65 66 | 6f 72 65 0a 20 2a 20 66 |used bef|ore. * f|
|00003e60| 69 72 73 74 20 6c 6f 63 | 6b 2f 75 6e 6c 6f 63 6b |irst loc|k/unlock|
|00003e70| 20 2a 2f 0a 76 6f 69 64 | 0a 73 65 6d 5f 73 65 74 | */.void|.sem_set|
|00003e80| 28 20 73 65 6d 5f 69 64 | 2c 20 76 61 6c 20 29 0a |( sem_id|, val ).|
|00003e90| 09 69 6e 74 20 73 65 6d | 5f 69 64 3b 0a 09 69 6e |.int sem|_id;..in|
|00003ea0| 74 20 76 61 6c 3b 0a 7b | 0a 09 75 6e 69 6f 6e 20 |t val;.{|..union |
|00003eb0| 73 65 6d 75 6e 20 61 72 | 67 3b 0a 09 65 78 74 65 |semun ar|g;..exte|
|00003ec0| 72 6e 20 69 6e 74 20 65 | 72 72 6e 6f 3b 0a 0a 09 |rn int e|rrno;...|
|00003ed0| 61 72 67 2e 76 61 6c 20 | 3d 20 76 61 6c 3b 0a 0a |arg.val |= val;..|
|00003ee0| 09 65 72 72 6e 6f 20 3d | 20 30 3b 0a 09 73 65 6d |.errno =| 0;..sem|
|00003ef0| 63 74 6c 28 20 73 65 6d | 5f 69 64 2c 20 30 2c 20 |ctl( sem|_id, 0, |
|00003f00| 53 45 54 56 41 4c 2c 20 | 61 72 67 20 29 3b 0a 09 |SETVAL, |arg );..|
|00003f10| 69 66 28 20 65 72 72 6e | 6f 20 21 3d 20 30 20 29 |if( errn|o != 0 )|
|00003f20| 7b 0a 09 09 70 65 72 72 | 6f 72 28 20 22 69 6e 74 |{...perr|or( "int|
|00003f30| 65 72 6e 61 6c 20 65 72 | 72 6f 72 2c 20 73 65 6d |ernal er|ror, sem|
|00003f40| 5f 73 65 74 22 20 29 3b | 0a 09 09 65 78 69 74 28 |_set" );|...exit(|
|00003f50| 20 2d 31 20 29 3b 0a 09 | 7d 0a 7d 0a 09 0a 69 6e | -1 );..|}.}...in|
|00003f60| 74 0a 6e 65 77 5f 73 65 | 6d 28 29 0a 7b 0a 09 69 |t.new_se|m().{..i|
|00003f70| 6e 74 20 73 65 6d 3b 0a | 0a 09 73 65 6d 20 3d 20 |nt sem;.|..sem = |
|00003f80| 73 65 6d 67 65 74 28 20 | 49 50 43 5f 50 52 49 56 |semget( |IPC_PRIV|
|00003f90| 41 54 45 2c 20 31 2c 20 | 49 50 43 5f 43 52 45 41 |ATE, 1, |IPC_CREA|
|00003fa0| 54 7c 53 5f 49 52 45 41 | 44 7c 53 5f 49 57 52 49 |T|S_IREA|D|S_IWRI|
|00003fb0| 54 45 20 29 3b 0a 09 69 | 66 28 20 73 65 6d 20 3c |TE );..i|f( sem <|
|00003fc0| 20 30 20 29 7b 0a 09 09 | 70 65 72 72 6f 72 28 20 | 0 ){...|perror( |
|00003fd0| 22 69 6e 74 65 72 6e 61 | 6c 20 65 72 72 6f 72 2c |"interna|l error,|
|00003fe0| 20 63 6f 75 6c 64 6e 27 | 74 20 63 72 65 61 74 65 | couldn'|t create|
|00003ff0| 20 73 65 6d 61 70 68 6f | 72 65 22 20 29 3b 0a 09 | semapho|re" );..|
|00004000| 09 65 78 69 74 28 20 2d | 31 20 29 3b 0a 09 7d 0a |.exit( -|1 );..}.|
|00004010| 09 73 65 6d 5f 73 65 74 | 28 20 73 65 6d 2c 20 31 |.sem_set|( sem, 1|
|00004020| 20 29 3b 0a 0a 09 72 65 | 74 75 72 6e 20 73 65 6d | );...re|turn sem|
|00004030| 3b 0a 7d 0a 0a 76 6f 69 | 64 0a 6c 6f 63 6b 28 20 |;.}..voi|d.lock( |
|00004040| 73 65 6d 5f 69 64 20 29 | 0a 09 69 6e 74 20 73 65 |sem_id )|..int se|
|00004050| 6d 5f 69 64 3b 0a 7b 0a | 09 73 74 72 75 63 74 20 |m_id;.{.|.struct |
|00004060| 73 65 6d 62 75 66 20 73 | 65 6d 62 75 66 3b 0a 0a |sembuf s|embuf;..|
|00004070| 09 73 65 6d 62 75 66 2e | 73 65 6d 5f 6e 75 6d 20 |.sembuf.|sem_num |
|00004080| 3d 20 30 3b 0a 09 73 65 | 6d 62 75 66 2e 73 65 6d |= 0;..se|mbuf.sem|
|00004090| 5f 6f 70 20 3d 20 2d 31 | 3b 0a 09 73 65 6d 62 75 |_op = -1|;..sembu|
|000040a0| 66 2e 73 65 6d 5f 66 6c | 67 20 3d 20 30 3b 0a 0a |f.sem_fl|g = 0;..|
|000040b0| 09 69 66 28 20 73 65 6d | 6f 70 28 20 73 65 6d 5f |.if( sem|op( sem_|
|000040c0| 69 64 2c 20 26 73 65 6d | 62 75 66 2c 20 31 20 29 |id, &sem|buf, 1 )|
|000040d0| 20 3d 3d 20 2d 31 20 29 | 7b 0a 09 09 66 70 72 69 | == -1 )|{...fpri|
|000040e0| 6e 74 66 28 20 73 74 64 | 65 72 72 2c 20 22 69 6e |ntf( std|err, "in|
|000040f0| 74 65 72 6e 61 6c 20 65 | 72 72 6f 72 2c 20 6c 6f |ternal e|rror, lo|
|00004100| 63 6b 20 69 64 20 25 64 | 5c 6e 22 2c 20 73 65 6d |ck id %d|\n", sem|
|00004110| 5f 69 64 20 29 3b 0a 09 | 09 70 65 72 72 6f 72 28 |_id );..|.perror(|
|00004120| 20 22 6c 6f 63 6b 20 65 | 72 72 6f 72 22 20 29 3b | "lock e|rror" );|
|00004130| 0a 09 09 65 78 69 74 28 | 20 2d 31 20 29 3b 0a 09 |...exit(| -1 );..|
|00004140| 7d 0a 7d 0a 0a 76 6f 69 | 64 0a 75 6e 6c 6f 63 6b |}.}..voi|d.unlock|
|00004150| 28 20 73 65 6d 5f 69 64 | 20 29 0a 09 69 6e 74 20 |( sem_id| )..int |
|00004160| 73 65 6d 5f 69 64 3b 0a | 7b 0a 09 73 74 72 75 63 |sem_id;.|{..struc|
|00004170| 74 20 73 65 6d 62 75 66 | 20 73 65 6d 62 75 66 3b |t sembuf| sembuf;|
|00004180| 0a 0a 09 73 65 6d 62 75 | 66 2e 73 65 6d 5f 6e 75 |...sembu|f.sem_nu|
|00004190| 6d 20 3d 20 30 3b 0a 09 | 73 65 6d 62 75 66 2e 73 |m = 0;..|sembuf.s|
|000041a0| 65 6d 5f 6f 70 20 3d 20 | 31 3b 0a 09 73 65 6d 62 |em_op = |1;..semb|
|000041b0| 75 66 2e 73 65 6d 5f 66 | 6c 67 20 3d 20 30 3b 0a |uf.sem_f|lg = 0;.|
|000041c0| 0a 09 69 66 28 20 73 65 | 6d 6f 70 28 20 73 65 6d |..if( se|mop( sem|
|000041d0| 5f 69 64 2c 20 26 73 65 | 6d 62 75 66 2c 20 31 20 |_id, &se|mbuf, 1 |
|000041e0| 29 20 3d 3d 20 2d 31 20 | 29 7b 0a 09 09 66 70 72 |) == -1 |){...fpr|
|000041f0| 69 6e 74 66 28 20 73 74 | 64 65 72 72 2c 20 22 69 |intf( st|derr, "i|
|00004200| 6e 74 65 72 6e 61 6c 20 | 65 72 72 6f 72 2c 20 6c |nternal |error, l|
|00004210| 6f 63 6b 20 69 64 20 25 | 64 5c 6e 22 2c 20 73 65 |ock id %|d\n", se|
|00004220| 6d 5f 69 64 20 29 3b 0a | 09 09 70 65 72 72 6f 72 |m_id );.|..perror|
|00004230| 28 20 22 75 6e 6c 6f 63 | 6b 20 65 72 72 6f 72 22 |( "unloc|k error"|
|00004240| 20 29 3b 0a 09 09 65 78 | 69 74 28 20 2d 31 20 29 | );...ex|it( -1 )|
|00004250| 3b 0a 09 7d 0a 7d 0a 0a | 76 6f 69 64 0a 72 65 6d |;..}.}..|void.rem|
|00004260| 6f 76 65 5f 73 65 6d 28 | 20 73 65 6d 5f 69 64 20 |ove_sem(| sem_id |
|00004270| 29 0a 09 69 6e 74 20 73 | 65 6d 5f 69 64 3b 0a 7b |)..int s|em_id;.{|
|00004280| 0a 09 69 66 28 20 73 65 | 6d 5f 69 64 20 3d 3d 20 |..if( se|m_id == |
|00004290| 2d 31 20 29 0a 09 09 72 | 65 74 75 72 6e 3b 0a 0a |-1 )...r|eturn;..|
|000042a0| 09 69 66 28 20 73 65 6d | 63 74 6c 28 20 73 65 6d |.if( sem|ctl( sem|
|000042b0| 5f 69 64 2c 20 30 2c 20 | 49 50 43 5f 52 4d 49 44 |_id, 0, |IPC_RMID|
|000042c0| 2c 20 4e 55 4c 4c 20 29 | 20 3d 3d 20 2d 31 20 29 |, NULL )| == -1 )|
|000042d0| 0a 09 09 70 65 72 72 6f | 72 28 20 22 69 6e 74 65 |...perro|r( "inte|
|000042e0| 72 6e 61 6c 20 65 72 72 | 6f 72 2c 20 66 61 69 6c |rnal err|or, fail|
|000042f0| 65 64 20 74 6f 20 72 65 | 6d 6f 76 65 20 73 65 6d |ed to re|move sem|
|00004300| 61 70 68 6f 72 65 22 20 | 29 3b 0a 7d 0a 53 48 41 |aphore" |);.}.SHA|
|00004310| 52 5f 45 4f 46 0a 66 69 | 20 23 20 65 6e 64 20 6f |R_EOF.fi| # end o|
|00004320| 66 20 6f 76 65 72 77 72 | 69 74 69 6e 67 20 63 68 |f overwr|iting ch|
|00004330| 65 63 6b 0a 23 09 45 6e | 64 20 6f 66 20 73 68 65 |eck.#.En|d of she|
|00004340| 6c 6c 20 61 72 63 68 69 | 76 65 0a 65 78 69 74 20 |ll archi|ve.exit |
|00004350| 30 0a                   |                         |0.      |        |
+--------+-------------------------+-------------------------+--------+--------+