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libc: improve diagnistics on initialization errors

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This change helps to draw the connection between warnings during the
initialization of file descriptors and the libc configuration.
This commit is contained in:
Norman Feske 2023-05-03 11:51:00 +02:00 committed by Christian Helmuth
parent 901cbf0af3
commit 2a49eee50f
1 changed files with 21 additions and 4 deletions
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25
repos/libports/src/lib/libc/kernel.cc
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@ -72,6 +72,18 @@ void Libc::Kernel::_init_file_descriptors()
{
typedef Genode::Token<Vfs::Scanner_policy_path_element> Path_element_token;
/* guard used to print an offending libc config when leaving the scope */
struct Diag_guard
{
Kernel &kernel;
bool show = false;
Diag_guard(Kernel &kernel) : kernel(kernel) { }
~Diag_guard() { if (show) log(kernel._libc_env.libc_config()); }
} diag_guard { *this };
auto resolve_symlinks = [&] (Absolute_path next_iteration_working_path, Absolute_path &resolved_path)
{
char path_element[PATH_MAX];
@ -183,6 +195,7 @@ void Libc::Kernel::_init_file_descriptors()
struct stat out_stat { };
if (_vfs.stat_from_kernel(path.string(), &out_stat) != 0) {
warning("failed to call 'stat' on ", path);
diag_guard.show = true;
return;
}
@ -194,8 +207,9 @@ void Libc::Kernel::_init_file_descriptors()
if (fd->libc_fd != libc_fd) {
error("could not allocate fd ",libc_fd," for ",path,", "
"got fd ",fd->libc_fd);
"got fd ",fd->libc_fd);
_vfs.close_from_kernel(fd);
diag_guard.show = true;
return;
}
@ -221,6 +235,7 @@ void Libc::Kernel::_init_file_descriptors()
} catch (Symlink_resolve_error) {
warning("failed to resolve path for ", attr_value);
diag_guard.show = true;
return;
}
};
@ -229,7 +244,7 @@ void Libc::Kernel::_init_file_descriptors()
Xml_node const node = _libc_env.libc_config();
typedef String<Vfs::MAX_PATH_LEN> Path;
using Path = String<Vfs::MAX_PATH_LEN>;
if (node.has_attribute("cwd"))
_cwd.import(node.attribute_value("cwd", Path()).string(), _cwd.base());
@ -248,8 +263,10 @@ void Libc::Kernel::_init_file_descriptors()
unsigned const flags = rd ? (wr ? O_RDWR : O_RDONLY)
: (wr ? O_WRONLY : 0);
if (!fd.has_attribute("path"))
warning("Invalid <fd> node, 'path' attribute is missing");
if (!fd.has_attribute("path")) {
warning("unknown path for file descriptor ", id);
diag_guard.show = true;
}
init_fd(fd, "path", id, flags);
});