̾??

rfork — ?ץ??????꥽??????????

?饤?֥???

Standard C Library (libc, -lc)

????

<unistd.h> pid_t rfork(int flags)

????

fork, vfork, rfork ?ϡ????????ץ?????????????????ͣ??????ˡ?Ǥ??? rfork() ?ؤΰ??? flags ?ϡ???ư???Ƥ????ץ????? (??) ?ΤɤΥ꥽?????????????ץ????? (??) ?? ???äƶ?ͭ?????뤫???ޤ??Ϥ??????Υǥե??????ͤ˽??????????뤫?????򤷤ޤ??? ?꥽?????ˤϥ????ץ??ե????뵭?һҥơ??֥? (?????ϡ???ͭ?????????硢 ?ץ???????¾?Υץ??????ˤĤ??ƥե??????????Ĥ??뤳?Ȥ? ???Ƥ??ޤ?) ?????ӥ????ץ??ե????뤬?ޤޤ??ޤ??? flags ?????ϼ??ι??ܤ??????? (OR) ?Ǥ?:

RFPROC

???ꤵ???Ƥ??????硢???????ץ????????????????ޤ??? ?????Ǥʤ????硢?ѹ??????ߤΥץ??????˱ƶ????ڤܤ??ޤ???

RFNOWAIT

???ꤵ???Ƥ??????硢?ҥץ??????Ͽƥץ?????????ʬΥ?????ޤ??? ??λ???ˡ??ҥץ??????ϡ??ƥץ????????????륹?ơ????????Ĥ??ޤ????? wait(2) ?򻲾Ȥ??Ƥ?????????

RFFDG

???ꤵ???Ƥ??????硢??ư¦?Υե????뵭?һҥơ??֥? (intro(2) ?򻲾?) ?????ԡ??????ޤ??? ?????Ǥʤ????硢2 ?ĤΥץ??????? 1 ?ĤΥơ??֥?????ͭ???ޤ???

RFCFDG

???ꤵ???Ƥ??????硢???????ץ??????Ͽ??????ե????뵭?һҥơ??֥??????ä? ???Ϥ??ޤ??? RFFDG ?Ȥϸߤ?????¾Ū?Ǥ???

RFMEM

???ꤵ???Ƥ??????硢 ?̾?ϡ??ɥ??????Υڡ????ơ??֥???ľ?ܶ?ͭ???뤳?Ȥǡ? ?????ͥ??ϥ??ɥ쥹???????Τ?????Ū?˶?ͭ???ޤ??? ?Ҥϡ????Τ褦????ˡ?ǡ??ƥץ?????????ͭ???Ƥ??뤹?٤ƤΥ????????Ȥ??? ???줬???ʶ?ͭ??ǽ?Ǥ??뤫?ݤ??˴ط??ʤ????Ѿ?????ͭ???ޤ??? ?????å??????????Ȥ?ʬ?䤵???ʤ? (?ƤȻҤ?ξ????Ʊ???????å?????????????) ?Τǡ?RFMEM ?ե饰?????ꤷ?? rfork() ?ϰ??̤ˡ?C ???????ޤ????????줫??ľ?ܸƤӽФ????ȤϤǤ??ޤ????? ??????????ǽ?ʥե饰?? RFPROC ?????Ǥ??? ?????????????褷???󶡤??줿?????å????ǿ??????ץ??????? ???餻?뤿?????????ؿ????󶡤????Ƥ??ޤ??? ?ܤ????? rfork_thread(3) ?򻲾Ȥ??Ƥ?????????

RFSIGSHARE

???ꤵ???Ƥ??????硢?????ͥ??ϡ??ƻҴ֤? sigacts ??¤?Τ?????Ū?˶?ͭ???ޤ???

RFLINUXTHPN

???ꤵ???Ƥ??????硢?????ͥ??ϡ??ҤˤĤ??ƤΥ????åɽ?λ???ˡ? SIGCHILD ?????????? SIGUSR1 ???֤??ޤ??? ???????????? Linux ????????ư???????魯?뤿???Ǥ???

??ͭ?ե????뵭?һҥơ??֥????Υե????뵭?һҤϡ? ????Ū???Ĥ??????뤫???ޤ??ϥơ??֥??? ??ͭ???Ƥ??뤹?٤ƤΥץ?????????λ?????ޤdz??????ޤޤ??ݤ????ޤ???

RFPROC ?????ꤵ???Ƥ??????硢 ?ƥץ??????????֤??????ͤϻҥץ??????Υץ????? ID ?Ǥ??? ?ҥץ??????????֤??????ͤ? 0 ?Ǥ??? RFPROC ???ʤ????硢?????ͤ? 0 ?Ǥ??? ?ץ????? ID ???ϰϤ? 1 ?????????????? (int) ?Ǥ??? ɬ?פǤ????С??׵ᤵ?줿?ץ??????꥽?????????ѤǤ????褦?ˤʤ??ޤ? rfork() ?????ƥॳ???????Ե????ޤ???

fork() ?????ƥॳ?????ϡ? rfork(RFFDG | RFPROC) ?ؤθƤӽФ??Ȥ??Ƽ?????ǽ?Ǥ??????????ߴ????Τ????? ???Τ褦?ˤϼ????????Ƥ??ޤ?????

??????

?????˴?λ???????硢 rfork() ?ϡ??ҥץ????????? 0 ???֤????ҥץ??????Υץ????? ID ???ƥץ??????? ?֤??ޤ??? ?????Ǥʤ????硢?ҥץ??????Ϻ??????줺?ˡ??? -1 ???ƥץ????????֤??졢 ???顼?򼨤??????˥??????Х??ѿ? errno ?????ꤵ???ޤ???

???顼

rfork() ?????ƥॳ?????ϡ????ξ????˽????????Ԥ????ҥץ??????Ϻ????????ޤ???:

[EAGAIN]

?¹????Υץ??????ι??׿????????ƥ??βݤ????¤?Ķ?ᤷ?Ƥ??ޤ??ޤ??? ???¤? sysctl(3) MIB ?ѿ? KERN_MAXPROC ?ˤ??äƻ??ꤵ???ޤ? (?????ѥ桼?????????ơ????¤ϼºݤˤ? ???????? 10 ?ľ??ʤ??ʤ??ޤ?)??

[EAGAIN]

?桼?????????ѥ桼???ǤϤʤ???1 ?ͤΥ桼???ˤ????¹????? ?ץ??????ι??׿????????ƥ??βݤ??????¤?Ķ?ᤷ?Ƥ??ޤ??ޤ??? ???¤ϡ? sysctl(3) MIB ?ѿ? KERN_MAXPROCPERUID ?ˤ??äƻ??ꤵ???ޤ???

[EAGAIN]

?桼?????????ѥ桼???ǤϤʤ??? resource ???? RLIMIT_NOFILE ???б????륽?եȥ꥽?????????¤?Ķ?ᤷ?Ƥ??ޤ??ޤ? (getrlimit(2) ?򻲾?)??

[EINVAL]

RFFDG ?ե饰?? RFCFDG ?ե饰??ξ???????ꤵ???ޤ?????

[EINVAL]

?????ޤǤ????󤵤??Ƥ??ʤ??ե饰?????ꤵ???ޤ?????

[ENOMEM]

???????ץ??????Ѥ˽?ʬ?ʥ????å׶??֤???­???ޤ?????

??Ϣ????

fork(2), intro(2), minherit(2), vfork(2), rfork_thread(3)

?Х?

FreeBSD ?Ǥϡ??ͥ??ƥ??֤? clone() ?饤?֥??ꥳ??????̤???˼????????Ƥ??ޤ??󤷡? ???ߤ? pthreads ?????? RFMEM ?????ꤷ?? rfork() ?????Ѥ??Ƥ??ޤ????? linux ?????åɥ饤?֥????Υͥ??ƥ??֥ݡ??ȤǤ??롢 /usr/ports/devel/linuxthreads ?? RFMEM ?????Ѥ???ư??? clone() ?ƤӽФ????ޤ??Ǥ??ޤ??? rfork_thread(3) ?ؿ??? clone() ?????????Ȥ??????Ѥ??뤳?Ȥ??Ǥ??ޤ???

????

rfork() ?ؿ??? Plan9 ?ǤϤ??????о줷?ޤ?????