irmd: Move registry objects to their own sources

Rename internal data structures so it's clear that they are the IRMd
representation of these objects for management purposes.

Split functionality for these objects off and and move them to their
own source files.

Rename internal functions of the IRMd to reflect this, with some small
refactoring.

Signed-off-by: Dimitri Staessens <[email protected]>
Signed-off-by: Sander Vrijders <[email protected]>

1 files changed, 265 insertions, 0 deletions

diff --git a/src/irmd/reg/proc.c b/src/irmd/reg/proc.c
new file mode 100644
index 00000000..1aae789d
--- /dev/null
+++ b/src/irmd/reg/proc.c
@@ -0,0 +1,265 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2023
+ *
+ * The IPC Resource Manager - Registry - Processes
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#else
+#define _POSIX_C_SOURCE 200112L
+#endif
+
+#include "config.h"
+
+#include <ouroboros/list.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/time_utils.h>
+
+#include "proc.h"
+#include "name.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <assert.h>
+
+struct reg_proc * reg_proc_create(pid_t        pid,
+                                  const char * prog)
+{
+        struct reg_proc *  proc;
+        pthread_condattr_t cattr;
+
+        assert(prog);
+
+        proc = malloc(sizeof(*proc));
+        if (proc == NULL)
+                goto fail_malloc;
+
+        if (pthread_condattr_init(&cattr))
+                goto fail_condattr;
+
+#ifndef __APPLE__
+        pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
+#endif
+
+        if (pthread_mutex_init(&proc->lock, NULL))
+                goto fail_mutex;
+
+        if (pthread_cond_init(&proc->cond, &cattr))
+                goto fail_cond;
+
+        proc->set = shm_flow_set_create(pid);
+        if (proc->set == NULL)
+                goto fail_set;
+
+        proc->prog = strdup(prog);
+        if(proc->prog == NULL)
+                goto fail_prog;
+
+        list_head_init(&proc->next);
+        list_head_init(&proc->names);
+
+        proc->pid      = pid;
+        proc->name     = NULL;
+        proc->state    = PROC_INIT;
+
+        return proc;
+
+ fail_prog:
+        shm_flow_set_destroy(proc->set);
+ fail_set:
+        pthread_cond_destroy(&proc->cond);;
+ fail_cond:
+        pthread_mutex_destroy(&proc->lock);
+ fail_mutex:
+        pthread_condattr_destroy(&cattr);
+ fail_condattr:
+        free(proc);
+ fail_malloc:
+        return NULL;
+}
+
+static void cancel_reg_proc(void * o)
+{
+        struct reg_proc * proc = (struct reg_proc *) o;
+
+        proc->state = PROC_NULL;
+
+        pthread_mutex_unlock(&proc->lock);
+}
+
+void reg_proc_destroy(struct reg_proc * proc)
+{
+        struct list_head * p;
+        struct list_head * h;
+
+        assert(proc);
+
+        pthread_mutex_lock(&proc->lock);
+
+        if (proc->state == PROC_DESTROY) {
+                pthread_mutex_unlock(&proc->lock);
+                return;
+        }
+
+        if (proc->state == PROC_SLEEP)
+                proc->state = PROC_DESTROY;
+
+        pthread_cond_signal(&proc->cond);
+
+        pthread_cleanup_push(cancel_reg_proc, proc);
+
+        while (proc->state != PROC_INIT)
+                pthread_cond_wait(&proc->cond, &proc->lock);
+
+        pthread_cleanup_pop(false);
+
+        pthread_mutex_unlock(&proc->lock);
+
+        shm_flow_set_destroy(proc->set);
+
+        pthread_cond_destroy(&proc->cond);
+        pthread_mutex_destroy(&proc->lock);
+
+        list_for_each_safe(p, h, &proc->names) {
+                struct str_el * n = list_entry(p, struct str_el, next);
+                list_del(&n->next);
+                if (n->str != NULL)
+                        free(n->str);
+                free(n);
+        }
+
+        free(proc->prog);
+        free(proc);
+}
+
+int reg_proc_add_name(struct reg_proc * proc,
+                      const char *      name)
+{
+        struct str_el * s;
+
+        assert(proc);
+        assert(name);
+
+        s = malloc(sizeof(*s));
+        if (s == NULL)
+                goto fail_malloc;
+
+        s->str = strdup(name);
+        if (s->str == NULL)
+                goto fail_name;
+
+        list_add(&s->next, &proc->names);
+
+        return 0;
+
+ fail_name:
+        free(s);
+ fail_malloc:
+        return -ENOMEM;
+}
+
+void reg_proc_del_name(struct reg_proc * proc,
+                       const char *      name)
+{
+        struct list_head * p = NULL;
+        struct list_head * h = NULL;
+
+        assert(proc);
+        assert(name);
+
+        list_for_each_safe(p, h, &proc->names) {
+                struct str_el * s = list_entry(p, struct str_el, next);
+                if (!strcmp(name, s->str)) {
+                        list_del(&s->next);
+                        free(s->str);
+                        free(s);
+                }
+        }
+}
+
+int reg_proc_sleep(struct reg_proc * proc,
+                   struct timespec * dl)
+{
+
+        int ret = 0;
+
+        assert(proc);
+
+        pthread_mutex_lock(&proc->lock);
+
+        if (proc->state != PROC_WAKE && proc->state != PROC_DESTROY)
+                proc->state = PROC_SLEEP;
+
+        pthread_cleanup_push(cancel_reg_proc, proc);
+
+        while (proc->state == PROC_SLEEP && ret != -ETIMEDOUT)
+                if (dl != NULL)
+                        ret = -pthread_cond_timedwait(&proc->cond,
+                                                      &proc->lock, dl);
+                else
+                        ret = -pthread_cond_wait(&proc->cond, &proc->lock);
+
+        pthread_cleanup_pop(false);
+
+        if (proc->state == PROC_DESTROY) {
+                if (proc->name != NULL)
+                        reg_name_del_pid(proc->name, proc->pid);
+                ret = -1;
+        }
+
+        proc->state = PROC_INIT;
+
+        pthread_cond_broadcast(&proc->cond);
+        pthread_mutex_unlock(&proc->lock);
+
+        return ret;
+}
+
+void reg_proc_wake(struct reg_proc * proc,
+                   struct reg_name * name)
+{
+        assert(proc);
+        assert(name);
+
+        pthread_mutex_lock(&proc->lock);
+
+        if (proc->state != PROC_SLEEP) {
+                pthread_mutex_unlock(&proc->lock);
+                return;
+        }
+
+        proc->state = PROC_WAKE;
+        proc->name  = name;
+
+        pthread_cond_broadcast(&proc->cond);
+
+        pthread_cleanup_push(cancel_reg_proc, proc);
+
+        while (proc->state == PROC_WAKE)
+                pthread_cond_wait(&proc->cond, &proc->lock);
+
+        pthread_cleanup_pop(false);
+
+        if (proc->state == PROC_DESTROY)
+                proc->state = PROC_INIT;
+
+        pthread_mutex_unlock(&proc->lock);
+}