{"id":16770,"date":"2022-10-22T03:13:06","date_gmt":"2022-10-21T21:43:06","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-segmentation-fault-filing-sleep-function\/"},"modified":"2022-10-22T03:13:06","modified_gmt":"2022-10-21T21:43:06","slug":"solved-segmentation-fault-filing-sleep-function","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-segmentation-fault-filing-sleep-function\/","title":{"rendered":"[Solved] segmentation fault filing sleep function"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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The else<\/code> branch of the if(fsize==0)<\/code> conditional in csvwrite()<\/code> does not fclose(fe)<\/code>. There is a limit on the number of files that can be opened by any one process at once; if you call this enough times, you’ll hit the limit, and the next fopen()<\/code> will return NULL<\/code> (and errno<\/code> will be set to EMFILE<\/code> – “Too many open files”).<\/p>\n

That may or may not be the problem, so here’s some more general advice:<\/p>\n

    \n
  1. \n

    Use a debugger. If you don’t know how, you should learn! For example:<\/p>\n

    $ cat test.c\n#include <stdio.h>\n\nint main(void)\n{\n    int a = 123, b, c;\n    int *p = &a;\n    int *q = NULL;\n\n    b = *p;\n    c = *q;\n    printf(\"%d %d\\n\", b, c);\n    return 0;\n}\n$ gcc -Wall -o test test.c\n$ .\/test\nSegmentation fault\n$\n<\/code><\/pre>\n
    Not very helpful.  But compile with -g<\/code> and run it with gdb<\/code>:<\/p>\n<\/p>\n
    $ gcc -g<\/b> -Wall -o test test.c\n$ gdb .\/test<\/b>\nGNU gdb 6.8-debian\nCopyright (C) 2008 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <http:\/\/gnu.org\/licenses\/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.  Type \"show copying\"\nand \"show warranty\" for details.\nThis GDB was configured as \"i486-linux-gnu\"...\n(gdb) run\nStarting program: \/tmp\/test \n<\/pre>\n
    …and it will reveal the line where it fails:<\/p>\n
    \nProgram received signal SIGSEGV, Segmentation fault.\n0x080483d4 in main () at test.c:10\n10        c = *q;<\/b>\n(gdb) quit\nThe program is running.  Exit anyway? (y or n) y\n$ \n<\/pre>\n<\/li>\n
  2. \n
    Compile with warnings enabled (as I have done above with the -Wall<\/code> flag).  The compiler is capable of spotting quite a lot of silly things, but you have to ask it.<\/p>\n<\/li>\n
  3. \n
    Try indenting the code sensibly.  Readable code is easier to debug.<\/p>\n<\/li>\n
  4. \n
    Remember to check return values.  fopen()<\/code> in particular can fail for any number of reasons which are unrelated to your program.<\/p>\n<\/li>\n
  5. \n
    Don’t write vast amounts of practically identical code.  If you have to do the same job more than once, consider factoring it out into a separate function.<\/p>\n<\/li>\n<\/ol>\n<\/div>\n
    <\/div>\n<\/div>\n
                1<\/span> <\/p><\/div>\n<\/div>\n
    [ad_2]<\/p>\n
    solved segmentation fault filing sleep function <\/p>\n","protected":false},"excerpt":{"rendered":"
    [ad_1] The else branch of the if(fsize==0) conditional in csvwrite() does not fclose(fe). There is a limit on the number of files that can be opened by any one process at once; if you call this enough times, you’ll hit the limit, and the next fopen() will return NULL (and errno will be set to … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,575,424],"class_list":["post-16770","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-file-io","tag-linux"],"yoast_head":"\n[Solved] segmentation fault filing sleep function - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-segmentation-fault-filing-sleep-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] segmentation fault filing sleep function - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The else branch of the if(fsize==0) conditional in csvwrite() does not fclose(fe). 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