When will ofstream::open fail?

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The open(2) man page on Linux has about 30 conditions. Some intresting ones are:

  • If the file exists and you don’t have permission to write it.
  • If the file doesn’t exist, and you don’t have permission (on the diretory) to create it.
  • If you don’t have search permission on some parent directory.
  • If you pass in a bogus char* for the filename.
  • If, while opening a device file, you press CTRL-C.
  • If the kernel encountered too many symbolic links while resolving the name.
  • If you try to open a directory for writing.
  • If the pathname is too long.
  • If your process has too many files open already.
  • If the system has too many files open already.
  • If the pathname refers to a device file, and there is no such device in the system.
  • If the kernel has run out of memory.
  • If the filesystem is full.
  • If a component of the pathname is not a directory.
  • If the file is on a read-only filesystem.
  • If the file is an executable file which is currently being executed.

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