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mount_parse_generic_args()

Strip off common mount arguments

Synopsis:

#include <sys/mount.h>

char * mount_parse_generic_args( char * options, 
                                 int * flags );

Arguments:

options: The string of options that you want to parse; see below.
flags: A pointer to a location where the function can store a set of bits corresponding to the options that it finds; see below.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The mount_parse_generic_args() function parses the given options, removes any options that it recognizes, and sets or clears the appropriate bits in the location pointed to by flags.

This function lets you strip out common flags to help you parse mount arguments. This is useful when you want to create a custom mount utility.

Here's a list of the supported options that may be stripped:

Option:	Set/Clear this bit:	Description:
`after`	Set _MOUNT_AFTER	Call resmgr_attach() with _RESMGR_FLAG_AFTER.
`atime`	Clear _MOUNT_ATIME	Log file access times (default).
`before`	Set _MOUNT_BEFORE	Call resmgr_attach() with _RESMGR_FLAG_BEFORE.
`creat`	Clear _MOUNT_CREAT	Allow file creation on the filesystem (default).
`enumerate`	Set _MOUNT_ENUMERATE	Auto-detect on this device.
`exec`	Clear _MOUNT_NOEXEC	Load executables (default).
`force`	Set _MOUNT_FORCE	Force an unmount or a remount change.
`noatime`	Set _MOUNT_NOATIME	Disable logging of file access times.
`nocreat`	Set _MOUNT_NOCREAT	Don't allow file creation on the filesystem.
`noexec`	Set _MOUNT_NOEXEC	Don't allow executables to load.
`nostat`	Set _MFLAG_OCB	Don't attempt to stat() the special device before mounting (i.e. `-t`).
`nosuid`	Set _MOUNT_NOSUID	Don't honor setuid bits on the filesystem.
`opaque`	Set _MOUNT_OPAQUE	Call resmgr_attach() with _RESMGR_FLAG_OPAQUE.
`remount`	Set _MOUNT_REMOUNT	This path is already mounted; perform an update.
`ro`	Set _MOUNT_READONLY	Mark the filesystem mountpoint as read-only.
`rw`	Clear _MOUNT_READONLY	Mark the filesystem mountpoint as read/write (default).
`suid`	Clear _MOUNT_SUID	Honor setuid bits on the filesystem (default).
`update`	Set _MOUNT_REMOUNT	This path is already mounted; perform an update.

Returns:

A pointer to the modified options string, which contains any options that it didn't recognize, or NULL if the function processed all the options.

Examples:

while ((c = getopt(argv, argc, "o:"))) {
  switch (c) {
  case 'o':
    if ((mysteryop = mount_parse_generic_args(optarg, &flags))) {
           /*
            You can do your own getsubopt type processing here.
            mysteryop doesn't contain the common options.
           */
    }
    break;
  }
}

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes