̾??

fork — ???????ץ???????????????

?饤?֥???

Standard C Library (libc, -lc)

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<sys/types.h> <unistd.h> pid_t fork(void)

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fork() ?????ƥॳ?????ˤ??äƿ??????ץ??????κ??????Ԥ????ޤ??? ???????ץ????? (?ҥץ?????)?ϡ? ?ʲ??ι??ܤ????????ƤӽФ??ץ????? (?ƥץ?????) ?????Τʥ??ԡ??Ǥ???

• ?ҥץ??????ϥ??ˡ????ʥץ????? ID ???????ޤ???
• ?ҥץ??????ϰۤʤ??ƥץ????? ID ???????ޤ? (???ʤ??????ƥץ??????Υץ????? ID ?Ǥ?)??
• ?ҥץ??????ϡ????ѤΡ??Ƥε??һҤΥ??ԡ????????ޤ??? ???????ε??һҤϲ??ؤ?Ʊ?????֥??????Ȥ򻲾Ȥ??ޤ??? ?Ĥޤ??ҤȿƤδ֤ǡ????Ȥ??Хե????륪?֥??????????? ?ե??????ݥ??󥿤???ͭ?????ޤ??? ???Τ????ҥץ??????ε??һҤؤ? lseek(2) ???????θ??οƤˤ??? read(2) ?ޤ??? write(2) ?˱ƶ????ڤܤ??ޤ??? ???ε??һҥ??ԡ??ϡ??????????????줿?ץ??????Ѥ?ɸ???????Ϥ???Ω???뤿???ˡ? ?????ӥѥ??פ򥻥åȥ??åפ??뤿???ˡ????????ˤ??äƤ????Ѥ????ޤ???
• ?ҥץ??????Υ꥽???????Ѿ????? 0 ?????ꤵ???ޤ??? setrlimit(2) ?򻲾Ȥ??Ƥ?????????
• ???٤ƤΥ??󥿡??Х륿???ޤ????ꥢ?????ޤ??? setitimer(2) ?򻲾Ȥ??Ƥ?????????

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

???顼

???ξ????? fork() ?????ƥॳ?????Ͻ????˼??Ԥ????ҥץ??????Ϻ????????ޤ???:

[EAGAIN]

?¹????Υץ??????ι??׿????????ƥ??θ³???Ķ???ޤ??? ?³??ͤ? sysctl(3) ?? MIB ?ѿ??? KERN_MAXPROC ?ˤ??äƻ??ꤵ???ޤ? (?????ѥ桼?????????ơ? ?ºݤˤϸ³??Ϥ??????? 10 ?ľ??ʤ??ʤ??ޤ?)??

[EAGAIN]

?桼?????????ѥ桼???Ǥʤ??? 1 ?ͤΥ桼???ˤ??äƼ¹????Υץ??????ι??׿??????????ƥ??θ³????ۤ??ޤ??? ?³??? sysctl(3) ?? MIB ?ѿ??? KERN_MAXPROCPERUID ?ˤ??äƻ??ꤵ???ޤ???

[EAGAIN]

?桼?????????ѥ桼???Ǥʤ??? resource ?????? RLIMIT_NPROC ???б????륽?եȥ꥽?????³????ۤ??ޤ? (getrlimit(2) ?򻲾?)??

[ENOMEM]

???????ץ??????ѤΥ????å׶??֤??Խ?ʬ?Ǥ???

??Ϣ????

execve(2), rfork(2), setitimer(2), setrlimit(2), vfork(2), wait(2)

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fork() ?ؿ??? Version 6 AT&T UNIX ???о줷?ޤ?????