在我的 C 代码中，我使用 open() 和选项 O_CREAT|O_RDWR 写入文件，然后是 write():
readfd = open("ak.bin", O_CREAT|O_RDWR);
if (readfd >= 0) {
res = write(readfd, key, 16);
close(readfd);
}
在执行我的程序后，我发现文件"ak.bin" 只有写权限。我看不懂!
$ ls -l | grep ak
-----w---- 1 mohamed mohamed 16 Jun 3 18:30 ak.bin
我缺少什么？我希望我的文件也可读。
最佳答案
您应该在创建 (O_CREAT) 文件时指定模式。
来自男人open(2) :
The mode argument specifies the file mode bits be applied when a new file is created. This argument must be supplied when O_CREAT or O_TMPFILE is specified in flags; if neither O_CREAT nor O_TMPFILE is specified, then mode is ignored. The effective mode is modified by the process's umask in the usual way: in the absence of a default ACL, the mode of the created file is (mode & ~umask). Note that this mode applies only to future accesses of the newly created file; the open() call that creates a read-only file may well return a read/write file descriptor.
关于c - 使用 O_CREAT|O_RDWR 打开文件将导致文件为只写，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37620454/