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Implement base construct of new external renderer. CLI parameters still not implemented. Currently NULL is passed to init func. Forking implemented but not tested

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This commit is contained in:
Mario Hüttel 2019-11-12 21:15:36 +01:00
parent f15e82b5dc
commit f153485996
1 changed files with 48 additions and 6 deletions
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54
output-renderers/external-renderer.c
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@ -30,8 +30,12 @@
#include <dlfcn.h>
#include <stdio.h>
#include <sys/wait.h>
#include <gds-render/output-renderers/external-renderer.h>
#include <gds-render/version.h>
#define FORCE_FORK 0U /**< @brief if != 0, then forking is forced regardless of the shared object's settings */
struct _ExternalRenderer {
GdsOutputRenderer parent;
@ -58,9 +62,13 @@ static int external_renderer_render_cell(struct gds_cell *toplevel_cell, GList *
const char *output_file, double scale, const char *so_path)
{
int (*so_render_func)(struct gds_cell *, GList *, const char *, double) = NULL;
int (*so_init_func)(const char *, const char *) = NULL;
void *so_handle = NULL;
char *error_msg;
int forking_req;
int ret = 0;
pid_t fork_pid = 0;
int forked_status;
if (!so_path) {
fprintf(stderr, "Path to shared object not set!\n");
@ -78,7 +86,7 @@ static int external_renderer_render_cell(struct gds_cell *toplevel_cell, GList *
return -2000;
}
/* Load symbol from library */
/* Load rendering symbol from library */
so_render_func = (int (*)(struct gds_cell *, GList *, const char *, double))
dlsym(so_handle, xstr(EXTERNAL_LIBRARY_RENDER_FUNCTION));
error_msg = dlerror();
@ -87,13 +95,47 @@ static int external_renderer_render_cell(struct gds_cell *toplevel_cell, GList *
goto ret_close_so_handle;
}
/* Execute */
if (so_render_func) {
g_message("Calling external renderer.");
ret = so_render_func(toplevel_cell, layer_info_list, output_file, scale);
g_message("External renderer finished.");
/* Load the init function */
so_init_func = (int (*)(const char *, const char *))dlsym(so_handle, xstr(EXTERNAL_LIBRARY_INIT_FUNCTION));
error_msg = dlerror();
if (error_msg != NULL) {
fprintf(stderr, "Rendering function not found in library:\n%s\n", error_msg);
goto ret_close_so_handle;
}
/* Check if forking is requested */
if (dlsym(so_handle, xstr(EXTERNAL_LIBRARY_FORK_REQUEST)))
forking_req = 1;
else if (FORCE_FORK)
forking_req = 1;
else
forking_req = 0;
/* Execute */
g_message("Calling external renderer.");
if (forking_req)
fork_pid = fork();
if (fork_pid != 0)
goto end_forked;
// TODO: Get parameters form command line and pass here
ret = so_init_func(NULL, _app_version_string);
if (!ret)
ret = so_render_func(toplevel_cell, layer_info_list, output_file, scale);
if (forking_req)
exit(ret);
end_forked:
if (forking_req) {
waitpid(fork_pid, &forked_status, 0);
ret = WEXITSTATUS(forked_status);
}
g_message("External renderer finished.");
ret_close_so_handle:
dlclose(so_handle);
return ret;