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我们可以使用fileno函数从FILE *流中获取文件描述符。有没有从文件描述符获取FILE *流而不重新打开文件的功能?如何从文件描述符中获取FILE *流?
我们可以使用fileno函数从FILE *流中获取文件描述符。有没有从文件描述符获取FILE *流而不重新打开文件的功能?如何从文件描述符中获取FILE *流?
FILE *fdopen(int fd, const char *mode);
见fdopen(3)
,但它应该是在同一页上fopen(3)
The fdopen() function associates a stream with the existing file
descriptor, fd. The mode of the stream (one of the values "r", "r+",
"w", "w+", "a", "a+") must be compatible with the mode of the file
descriptor. The file position indicator of the new stream is set to
that belonging to fd, and the error and end-of-file indicators are
cleared. Modes "w" or "w+" do not cause truncation of the file. The
file descriptor is not dup’ed, and will be closed when the stream cre‐
ated by fdopen() is closed. The result of applying fdopen() to a
shared memory object is undefined.