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Filesystem: Add and use rtems_filesystem_chmod()

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Implement POSIX requirements in the high-level file system layer.
This commit is contained in:
Sebastian Huber
2013-09-11 10:34:02 +02:00
parent 3dbb68d991
commit b6657c3957
5 changed files with 49 additions and 51 deletions
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5
cpukit/libcsupport/include/rtems/libio_.h
View File

@@ -566,6 +566,11 @@ int rtems_filesystem_mknod(
int rtems_filesystem_chdir( rtems_filesystem_location_info_t *loc );
int rtems_filesystem_chmod(
const rtems_filesystem_location_info_t *loc,
mode_t mode
);
int rtems_filesystem_chown(
const char *path,
uid_t owner,

2
cpukit/libcsupport/src/chmod.c
View File

@@ -33,7 +33,7 @@ int chmod( const char *path, mode_t mode )
const rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
rv = (*currentloc->mt_entry->ops->fchmod_h)( currentloc, mode );
rv = rtems_filesystem_chmod( currentloc, mode );
rtems_filesystem_eval_path_cleanup( &ctx );

49
cpukit/libcsupport/src/fchmod.c
View File

@@ -22,6 +22,42 @@
#include <rtems/libio_.h>
int rtems_filesystem_chmod(
const rtems_filesystem_location_info_t *loc,
mode_t mode
)
{
const rtems_filesystem_mount_table_entry_t *mt_entry = loc->mt_entry;
int rv;
if ( mt_entry->writeable || rtems_filesystem_location_is_null( loc ) ) {
struct stat st;
memset( &st, 0, sizeof(st) );
rv = (*loc->handlers->fstat_h)( loc, &st );
if ( rv == 0 ) {
uid_t uid = geteuid();
if ( uid == 0 || st.st_uid == uid ) {
mode_t mask = S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX;
mode = (st.st_mode & ~mask) | (mode & mask);
rv = (*mt_entry->ops->fchmod_h)( loc, mode );
} else {
errno = EPERM;
rv = -1;
}
}
} else {
errno = EROFS;
rv = -1;
}
return rv;
}
/**
* POSIX 1003.1b 5.6.4 - Change File Modes
*/
@@ -34,14 +70,11 @@ int fchmod( int fd, mode_t mode )
iop = rtems_libio_iop( fd );
rtems_libio_check_is_open(iop);
if (iop->pathinfo.mt_entry->writeable) {
rtems_filesystem_instance_lock( &iop->pathinfo );
rv = (*iop->pathinfo.mt_entry->ops->fchmod_h)( &iop->pathinfo, mode );
rtems_filesystem_instance_unlock( &iop->pathinfo );
} else {
errno = EROFS;
rv = -1;
}
rtems_filesystem_instance_lock( &iop->pathinfo );
rv = rtems_filesystem_chmod( &iop->pathinfo, mode );
rtems_filesystem_instance_unlock( &iop->pathinfo );
return rv;
}