d********f
发帖数: 8289 | | W***o
发帖数: 6519 | 2 sorry, I misspoke. fd is just an index in the file table of your own process
, fd is not a PID. To answer your question, another open is not necessary,
because the fd stays in the file table until you close it.
【在 d********f 的大作中提到】
: 还是必须close了，重新open啊？
: 谢谢。
| S*A
发帖数: 7142 | 3 fd 是 file descriptor， 为什么是 process id? 不太明白。 process 是
另外一个概念啊。
【在 W***o 的大作中提到】
: sorry, I misspoke. fd is just an index in the file table of your own process
: , fd is not a PID. To answer your question, another open is not necessary,
: because the fd stays in the file table until you close it.
| d********f
发帖数: 8289 | 4 sorry, 我没有说清楚。我是说比如fp1 = fdopen(fd, "r"); 用过之后还能够做fp2 =
fdopen(fd, "r")吗？还是要先close了fp1?可是close了fp1, fd也就被close了，
right？
process
【在 W***o 的大作中提到】
: sorry, I misspoke. fd is just an index in the file table of your own process
: , fd is not a PID. To answer your question, another open is not necessary,
: because the fd stays in the file table until you close it.
| p****f
发帖数: 251 | 5 you can open a file as many time as you can, each FP point to different
entry in the kernel, unless you do system call dup, which will only
duplicate the descriptor.
=
【在 d********f 的大作中提到】
: sorry, 我没有说清楚。我是说比如fp1 = fdopen(fd, "r"); 用过之后还能够做fp2 =
: fdopen(fd, "r")吗？还是要先close了fp1?可是close了fp1, fd也就被close了，
: right？
:
: process
| a9
发帖数: 21638 | 6 得共享读才可以打开多次吧、
fp2
【在 p****f 的大作中提到】
: you can open a file as many time as you can, each FP point to different
: entry in the kernel, unless you do system call dup, which will only
: duplicate the descriptor.
:
: =
| l*********s
发帖数: 5409 | 7 re
【在 p****f 的大作中提到】
: you can open a file as many time as you can, each FP point to different
: entry in the kernel, unless you do system call dup, which will only
: duplicate the descriptor.
:
: =
|
|
