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libposix: specify PosixOpenTranslator's behaviour on various flags

This commit is contained in:
Giacomo Tesio 2017-08-22 02:12:26 +02:00
parent 859bde60c8
commit 004dd6bff1
1 changed files with 16 additions and 2 deletions
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18
sys/include/posix.h
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@ -245,13 +245,27 @@ typedef PosixError (*PosixTimezoneReader)(void *timezone, const Tm *time);
extern int libposix_set_timezone_reader(PosixTimezoneReader reader);
/* Map the POSIX_open flag and mode to Jehanne's arguments to open
* or create.
* or create. It's also used in chmod to translate mode.
*
* omode is a pointer to the open/create omode argument
* cperm is a pointer to the create perm argument that must be filled
* only if O_CREATE has been set in mode.
* only if omode is nil or O_CREATE has been set in mode.
*
* Must return 0 on success or a PosixError on failure.
*
* In flag:
* - O_CLOEXEC must be mapped to OCEXEC in omode
* - O_TRUNC must be mapped to OTRUNC in omode
* - O_APPEND|O_CREAT must be mapped to DMAPPEND in cperm
* - O_APPEND without O_CREAT must return PosixENOTSUP
* - O_EXCL|O_CREAT must be mapped to DMEXCL in cperm
* - O_EXCL without O_CREAT it must return PosixENOTSUP
* - O_SEARCH must be mapped to OEXEC|DMDIR in omode
* - O_DIRECTORY|O_CREAT must return PosixEINVAL
* - O_DIRECTORY without O_CREAT must be mapped to DMDIR in omode
* - O_DSYNC, O_NOCTTY, O_NOFOLLOW, O_NONBLOCK, O_RSYNC, O_SYNC
* and O_TTY_INIT must be ignored
* - S_ISUID, S_ISGID, S_ISVTX must be ignored
*/
typedef PosixError (*PosixOpenTranslator)(int flag, int mode, long *omode, long *cperm);