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[CLI] Auto attach SHM_UI iff shm exists on start #249

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merged 3 commits into from
Oct 21, 2021
Merged

[CLI] Auto attach SHM_UI iff shm exists on start #249

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79f0873
[CLI] Auto attach SHM_UI iff it exists
levincent06 Oct 21, 2021
b96e4ef
[FORMAT] Format shm_ui.c
levincent06 Oct 21, 2021
704d670
Merge branch 'master' into auto_attach_ui
levincent06 Oct 21, 2021
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29 changes: 13 additions & 16 deletions tests/cli/shm_ui.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
* sudo apt-get install libncurses5-dev libncursesw5-dev
*/
#include <curses.h>
#include <stdbool.h>
#include <string.h>
#include <sys/wait.h>

Expand Down Expand Up @@ -104,10 +105,11 @@ const int DATA_VAL_COL = COMMAND_VAL_COL + VALUE_WIDTH; //
*/
int DEVICE_WIN_IS_BLANK = 0;

// This is a global flag that is TRUE (1) when shm_ui is attaching to
// existing shared memory, and FALSE (0) when shm_ui is creating/destroying
// to shared memory and attaching to that newly created shared memory.
uint8_t attach = 0;
// Initalized to FALSE -- This process will create shm
// and destroy it when this process exits.
// Set to TRUE at the start of main() if shm already exists when shm_ui starts
// in which case we should not create/destroy shm
bool shm_already_exists = false;

// The header of DEVICE_WIN; Useful for clearing and redrawing DEVICE_WIN
#define DEVICE_WIN_HEADER "~~~~~~~~~~~~~~~~~~~~~~~~~~~~DEVICE INFORMATION~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
Expand Down Expand Up @@ -521,8 +523,7 @@ void display_device(uint32_t catalog, dev_id_t dev_ids[MAX_DEVICES], int shm_idx

// Sending SIGINT to the process will stop shared memory
void clean_up(int signum) {
// only stop shared memory if we did not attach
if (!attach) {
if (!shm_already_exists) {
stop_shm();
}
endwin();
Expand All @@ -534,17 +535,13 @@ int main(int argc, char** argv) {
signal(SIGINT, clean_up);
logger_init(TEST);

// If the argument "attach" is specified, then set the global variable
if (argc == 2 && strcmp(argv[1], "attach") == 0) {
attach = 1;
}

// Start shm if we aren't attaching to existing shared memory
if (!attach) {
// If SHM exists, simply attach to it. Otherwise, create SHM
if (shm_exists()) {
shm_init();
shm_already_exists = true;
} else {
start_shm();
sleep(1); // Allow shm to initialize
} else {
shm_init(); // If just attaching, init shm to have access to sems and shm blocks
}

// Start UI
Expand Down Expand Up @@ -629,7 +626,7 @@ int main(int argc, char** argv) {
}

// Properly clean up
if (!attach) {
if (!shm_already_exists) {
stop_shm();
}
endwin();
Expand Down