C++ 从STdin读写超过4096个字节

我正在try 实现一个像bash(C)中使用的文档一样的here文档，但我注意到我不能为它提供一行长度超过4096字节，我查了查，这是因为内核I/O队列的最大大小，所以我的进程永远不会收到我在shell中输入的完整输入.与此同时，狂欢节的heredoc可以处理这个问题.有没有一种方法可以使用C来解决这个问题.

对于任何超过4096个字符的单词，只有4096个字符会被打印，或者输入会被损坏

#include <unistd.h>

int main()
{
    ssize_t r_bytes;
    char buf[42];
    while (r_bytes = read(0, buf, 42))
    {
        write(1, buf, r_bytes);
    }
    return (0);
}

1-编译并执行此代码. 2-给它这个输入:

<start>herrslcrwhjsyxlnuvxoofkmnnqnqplyyomfekjdvifzmzqsjjffjlqgvxrmhplzfaywnsptodrwygvhtplduhivfefqefkwcrficiatatbvlpzikietxdfekfnqvgazseylfagktlaseeedbbeajmnvshwkzvlfyhdoswwzzdesnaphprclhihfdckjcpepytllszcucuyvgqlfreyknejkjbthgociqxzellhzgdqkpnglnaocygxqifkjikcrepkcosxclwqlhhgzndoqroocniwrjaoumuvlvtvdrsyaupmkldzhvurnzgwhpvsyzrqzxgtlythlqflciocyepzbxyepegfxifkuopqrivsnhzqhmjmbrdkoxwrgpmdntoqlksjxwrfdadkjzjvyknulhlhmseykfpqnpvfpfbxncefcbfzdfndkwskdusuhylklqcxnmbibgmerllmzgmorqpqawbiexnbgkuaxbiucrkfsxndhdifgrfiuyanximidvvfaqnurmsnvfnwahuvpyjjvpukbrkemqotmvnvqcwivueqisxqvrfunmaaeuguqpullxgyuypepxgkrmgpfxlihmazubjmnlifqoyfidhpvvpyraddjlxoalrhsrpviqkhmcszkluelumfpukwynrmlhdvnwhhukorlpqzouzakphkgorumfqabjxrtghrvynqazsoahewbhpujofcokzeapdlpkgzrrdnmmwintaoowbzctqnxatvfecwnirxaacqmsrbecdgikauqosygzyxkyfikryohidyslrizbwnnhbiwnqbbgqylhvkmtnazfdzvweucoqdovuzfuqlywxdfkmzgsssnprekjfnutlmhbdvtcngeitphqywvtmppptaxyielehppdxjgzuvwybjealhkjjlgibgjcysgvmgfvgqpnpmadtjlngmsxgvolvdlzkfyfqoujjiegunytjkxornyruaxgpqqjhqyfwymvyglnccfbdslqdbrqpmwtonklsajnuaemvkqwjuscectjwbvohfvuecltlkhszplqxipaymbtxjztjofubjblqrrantnfcsoirrvkwnvmwnwqpdsysqsokmwylnvvryhnaatnlbmvtfhbquzmnrukbvqbvwjdqrdgthrqpnjebcokbroruogaswulugwxkrrmbrkskqhlgbufanzafdsbgcqcjxntmczmzrsjqjfcpmetvjirmcpmfmobfslagzlvoppuachoyxbrgqejrdbykeczesigwwcmjdmvvzudouderjbhpihwaxhizaxejmckwnwgmhcgylephrukykldufcobjqrmiiqnxznmlnzpdbxgyxfnwdtgjeupvxdnzyvivpuvrfulypwzfgxmnomohfcvcyuhimpeelkwaurwcgcthvsfpppurrercewdfhryyyytzowizhtlzohewpqxjmacpgkhvjzopuoggswmowcbfhkdpkvbjajqjmqfqbovgiaojsfyaqzqmngemgytcsvsqfdpbcehxrcleqmguhnuipoqecwralfehnxrevtmgqbiqpfighujwpgqqfcumppeamwasfqkeochbptmezrmttngijtwawvojpmpkzozkkxzuxzggvcswowkjmtvtmzwptwolaflkddwbkmzxvnclqzsikajmyihcatjrnvqixbfnmpvigmmwmepppebohsidrquffvkmjxtuchozqbdcowfqpnrhxzrkxozpqfojuybxwcerlfmaveslyfnkvkphotyrdukcelzszlqaqyayvuzljfsgrltqherbwabxslbwxlrfnundvzvchgpllcenakkwaejdejpfqiarsomxgcoplpdrqdudcaopdxjziyvuqeolkqqopwzixmhpyaabjuoplqourpuzphjfyvvwoxlssgkkqrwewzikvkdgfwgtzkennzhlnuakywfiiwqvpsfqgkowunzfblrxiwqibulojvrjnbhgjookrazjzrhmhqxnxjmaupdczcwlhmhvaepgvdksckettpzqhkfbmszbqbqidnjnwcrloqduucjdgvisrlixrwsqtdrackbbwbfslpgrkycycqnbccebvcuivfkyejwwcfpuaqmuacfrcbjtmvwvcryuzlbvuwagcggiwwzxxbicvnwbafuubeqjuvrdcizwbnagdntjypfolexpesovyrupoxlnhtdcnhyppxoniqdpsfyhlarshtdgwbtbkjtklvdpztdumykphalytjaefwfhwhhnpqcwfcruhmmxoqngnvtfbxwfmfdkhivhitsdecqehowjmgxmdipdtsiwuxivdjmmwrkotqrdhwtnzfbhemboqkqkodaabxkedzkpxriuurifgfjhrtxpqlaoolqgbkdqyaatgnsdzhawpfhvwgtqjsdeopuwvgolouofwwzbhpeybvpglwwqjcjlqpsobgojoijblingffcrsydqcjjzlwoeklhxzecitrtihakcktvfnfblmhejybnsihzhmcgxayxoruyvnecnbbfpwieoejtfzjhjczduuldcflvwzjzruxlckvpyivtnyzfzdhfzptwjjggaeqsbgkkynqjpsuobflnaqbwayslrsvrgrbtjzhkbtmvicoxbdfexnuwzbvamumswnloymrjojujwtmcudbhcxvbxbcwzrzhjlrgoerptgczhldyskvqpqxxpuywrtltwyzkbpdmzgcaulbdygqfeoflgwnhtuaelesgjaawskmsccgyoqraabxppuueyfbdvuhvotgbswrtyfxliwkewxzpoetubihymgbmqnmaseemmonsgkbfsomawfjgxqqrjbfxpyissubkeafseucdpwasafhkkhsdygbgeypjesxeyafbdctkgorlcknmjtnqpjbkwwyztqailtefgjmkgujpynkfmtqnjvdqjgttnvejsvzahddzedysitrwumidnufktcozdfgshwzicuykokdjxszhcsimalzijyvylkaxdweafmtfgtkaepteyafqijbonhgxrqnkxwtpceajseopimpkvouzajzrrtbpiymsqxnrkmpejokpancnmmcincaddywnozsknikimutldarwabrzgvymatbamsbwaikbwatvqbpvfsdeafycximswbehmyzwzarqvcjtzyofhfjxagtrehvssqsbtowueuizqjuyjrulldgxtjtkirekhwaxhdfcnbwhyqtuinxpxddkvoiveoenwsgixpqqxupuunrgyddowemsegsovkigdwxgefzvmiuuafynnxukixpsnmiwszojlmcxvopwdazpcuxetclgatgzmvmeecppggaqhobatlyynzhdygxiatrktpgntmkqcjkuxmdlroounnxcebepchuokotvmqfctmtjsnplgjmeobzbwhxekvlbknvwughuppzuecumvqjylqkhlmpbbhmgrenotwyyquqhgrrboqvjskaczyhnukqogmqbngkrvsakcppveykzuqmsbxdfxjulofmpnilynqzzgdxbdjjzhskrthbwzjzugjsutgpgkromaccbjqitrhxlahzaygcvztjycifokrbxugvdmwxqqxibhgckxwhabbjsmnpencsplrxjnfanqtdgrruiomesapwfdvsotvkgqgfxeelavujnigyedrhwksraopenosfgbrdvogtudmxecvrvxvjjuaodjvajlgazeqsyemyysxpnilklpvzciwidtjebaczuhezsresvglzivbbodxakeighfawfanvdzzpadrcisfsqyhfbuyurppqdfekrolbzxvquulxhnwwndndirrcysbywooygizgbuiezholvuoqkyiorttcmzpseippnxkuilfsrxfknzkvzlqmdlupqkxdjxtiuxjghikocnpkocoauecaofnsyouizpbgvytkpxrfalhvpqymbxqetmozufwmcbycsalporhqzlfpbeqgffteuqeatujlrjyjhjjjhj<end>helloworld

输出是直到结束或损坏的4096字符串为止的所有内容.