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sm_process_death: Avoid redefinition errors due to kernel headers

Prior to the v5.10-based StarlingX kernel, the "#ifdef CONFIG_SIGEXIT"
guard in prctl.h would require the user-space to either define the
CONFIG_SIGEXIT macro, or define the PR_DO_NOTIFY_TASK_STATE macro *and*
the task_state_notify_info structure to avoid build failures. The
service manager code had taken the latter approach.

Now that the prctl.h header file has been fixed in the v5.10-based
kernel to not guard these user-space APIs with "#ifdef CONFIG_SIGEXIT",
the service manager is encountering the following compilation errors:

  sm_process_death.c:49:8: error: redefinition of \
    'struct task_state_notify_info'
   struct task_state_notify_info
          ^
  In file included from /usr/include/sys/prctl.h:22:0,
                   from sm_process_death.c:18:
  /usr/include/linux/prctl.h:76:8: error: previous definition of \
    'struct task_state_notify_info'
   struct task_state_notify_info {
          ^

This commit avoids these errors by detecting whether the
PR_DO_NOTIFY_TASK_STATE macro has already been defined, which ought to
preserve backwards compatibility with older StarlingX kernels.

Story: 2008921

Change-Id: I0c28fe8b3d314931583462a3377f81ec0ca1f630
Signed-off-by: M. Vefa Bicakci <vefa.bicakci@windriver.com>
changes/06/799706/3
M. Vefa Bicakci 3 months ago
parent
commit
ff9e32bb80
  1. 15
      service-mgmt/sm/src/sm_process_death.c

15
service-mgmt/sm/src/sm_process_death.c

@ -35,23 +35,28 @@
#define SM_KERNEL_NOTIFY_FLAGS \
( SM_KERNEL_NOTIFY_EXITED | SM_KERNEL_NOTIFY_KILLED )
#define SM_KERNEL_NOTIFY_SIGNAL (SIGRTMIN+1)
// Avoid redefinition errors for PR_DO_NOTIFY_TASK_STATE macro and
// task_state_notify_info struct as the kernel headers may have
// already defined them.
#ifndef PR_DO_NOTIFY_TASK_STATE
// Set/get notification for task state changes.
#define PR_DO_NOTIFY_TASK_STATE 17
#define SM_KERNEL_NOTIFY_SIGNAL (SIGRTMIN+1)
// This is the data structure for requestion process death
// (and other state change) information. Sig of -1 means
// query, sig of 0 means deregistration, positive sig means
// that you want to set it. sig and events are value-result
// and will be updated with the previous values on every
// successful call.
struct task_state_notify_info
struct task_state_notify_info
{
pid_t pid;
int sig;
unsigned int events;
int sig;
unsigned int events;
};
#endif // !PR_DO_NOTIFY_TASK_STATE
#endif // __SM_PROCESS_DEATH_KERNEL_NOTIFICATION_SUPPORTED__
#define SM_PROCESS_DEATH_MAX 1024

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