waitpid是如何來(lái)處理未決信號(hào)

wangruiyao2010

本人一直弄不清waitpid是怎么來(lái)處理未決信號(hào)的，主要是想知道waitpid(pid,&status,0)在處理未決信號(hào)時(shí)是一直等待還是有一個(gè)返回值？在些先謝謝了！

crazyhadoop

返回值存在 status中，至于阻塞的規(guī)則要看你 第三個(gè)參數(shù)的設(shè)置。

WNOHANG     return immediately if no child has exited.

WUNTRACED   also  return  if  a  child  has stopped (but not traced via
               ptrace(2)).  Status for traced children which have  stopped
               is provided even if this option is not specified.

WCONTINUED (since Linux 2.6.10)
                   also return if a stopped child has been resumed by delivery
                   of SIGCONT.

wangruiyao2010

waitpid(pid,&status,0)我的第三個(gè)參數(shù)是0

wangruiyao2010

高手去哪了…… 跪求呀……{:3_200:}