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libc_fs: Fix seek report for ro (non-append) files

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This commit is contained in:
Norman Feske 2013-03-29 22:42:15 +01:00
parent e4c28a1739
commit 973fdae9d8
1 changed files with 15 additions and 1 deletions
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16
libports/src/lib/libc_fs/plugin.cc
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@ -526,11 +526,25 @@ class Plugin : public Libc::Plugin
Plugin_context *context = new (Genode::env()->heap()) Plugin_context *context = new (Genode::env()->heap())
Plugin_context(handle); Plugin_context(handle);
/*
* Prevent returning the file size as current seek offset
* for files that are opened read only because this
* behaviour is only useful for appending write operations
* to files.
*
* XXX Improve handling of files opened in append mode.
*/
if ((flags & O_ACCMODE) == O_RDONLY)
context->seek_offset(0);
context->status_flags(flags); context->status_flags(flags);
Libc::File_descriptor *fd = Libc::file_descriptor_allocator()->alloc(this, context); Libc::File_descriptor *fd = Libc::file_descriptor_allocator()->alloc(this, context);
if ((flags & O_TRUNC) && (ftruncate(fd, 0) == -1)) if ((flags & O_TRUNC) && (ftruncate(fd, 0) == -1)) {
Libc::file_descriptor_allocator()->free(fd);
destroy(Genode::env()->heap(), context);
return 0; return 0;
}
return fd; return fd;
} }
catch (File_system::Lookup_failed) { catch (File_system::Lookup_failed) {