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sysprofd: add API to get a FD for a file in proc

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This is useful for optimized parsing of proc files such as necessary by
the memory source to seek() back to the start (instead of re-opening a
new file).
This commit is contained in:
Christian Hergert
2019-05-12 16:06:02 -07:00
parent 16bc6f970e
commit 9d72203687
6 changed files with 142 additions and 1 deletions
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46
src/sysprofd/ipc-service-impl.c
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@ -23,6 +23,7 @@
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <gio/gunixfdlist.h>
#include <polkit/polkit.h>
#include <string.h>
@ -88,6 +89,50 @@ ipc_service_impl_handle_get_proc_file (IpcService *service,
return TRUE;
}
static gboolean
ipc_service_impl_handle_get_proc_fd (IpcService *service,
GDBusMethodInvocation *invocation,
const gchar *path)
{
g_autoptr(GFile) file = NULL;
g_autoptr(GError) error = NULL;
g_autofree gchar *canon = NULL;
g_assert (IPC_IS_SERVICE_IMPL (service));
g_assert (G_IS_DBUS_METHOD_INVOCATION (invocation));
file = g_file_new_for_path (path);
canon = g_file_get_path (file);
if (g_str_has_prefix (canon, "/proc/") || g_str_has_prefix (canon, "/sys/"))
{
gint fd = open (canon, O_RDONLY | O_CLOEXEC);
if (fd != -1)
{
g_autoptr(GUnixFDList) fd_list = g_unix_fd_list_new ();
gint handle = g_unix_fd_list_append (fd_list, fd, &error);
close (fd);
if (handle != -1)
{
g_dbus_method_invocation_return_value_with_unix_fd_list (g_steal_pointer (&invocation),
g_variant_new ("(h)", handle),
fd_list);
return TRUE;
}
}
}
g_dbus_method_invocation_return_error (g_steal_pointer (&invocation),
G_DBUS_ERROR,
G_DBUS_ERROR_ACCESS_DENIED,
"Failed to load proc fd");
return TRUE;
}
static gboolean
ipc_service_impl_handle_perf_event_open (IpcService *service,
GDBusMethodInvocation *invocation,
@ -343,6 +388,7 @@ init_service_iface (IpcServiceIface *iface)
{
iface->handle_list_processes = ipc_service_impl_handle_list_processes;
iface->handle_get_proc_file = ipc_service_impl_handle_get_proc_file;
iface->handle_get_proc_fd = ipc_service_impl_handle_get_proc_fd;
iface->handle_perf_event_open = ipc_service_impl_handle_perf_event_open;
iface->handle_get_process_info = ipc_service_impl_handle_get_process_info;
}