c - fork() 时是否共享文件描述符？

Question

假设我用 open() 打开一个文件。然后我 fork() 我的程序。

父亲和 child 现在会共享相同的文件描述符偏移量吗？

我的意思是，如果我在父亲中写入，子代中的偏移量也会改变吗？

或者在 fork() 之后偏移量是独立的吗？

Answer 1

来自 fork(2):

  *  The child inherits copies of the parent’s set of open file  descrip-
     tors.   Each  file  descriptor  in the child refers to the same open
     file description (see open(2)) as the corresponding file  descriptor
     in  the parent.  This means that the two descriptors share open file
     status flags, current file offset, and signal-driven I/O  attributes
     (see the description of F_SETOWN and F_SETSIG in fcntl(2)).