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authorEd Schouten <ed@FreeBSD.org>2015-08-06 06:47:28 +0000
committerEd Schouten <ed@FreeBSD.org>2015-08-06 06:47:28 +0000
commit0f85ff377ba631b70bbddf521132c12b1d5dd250 (patch)
treea56156f75a5c8d0be9c50097e170560c1efd9583 /sbin
parentd98d7ba0b4de199558880f524d41a9e9c83b7558 (diff)
Add file_open(): the underlying system call of openat().
CloudABI purely operates on file descriptor rights (CAP_*). File descriptor access modes (O_ACCMODE) are emulated on top of rights. Instead of accepting the traditional flags argument, file_open() copies in an fdstat_t object that contains the initial rights the descriptor should have, but also file descriptor flags that should persist after opening (APPEND, NONBLOCK, *SYNC). Only flags that don't persist (EXCL, TRUNC, CREAT, DIRECTORY) are passed in as an argument. file_open() first converts the rights, the persistent flags and the non-persistent flags to fflags. It then calls into vn_open(). If successful, it installs the file descriptor with the requested rights, trimming off rights that don't apply to the type of the file that has been opened. Unlike kern_openat(), this function does not support /dev/fd/*. I can't think of a reason why we need to support this for CloudABI. Obtained from: https://github.com/NuxiNL/freebsd Differential Revision: https://reviews.freebsd.org/D3235
Notes: svn path=/head/; revision=286359
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