showed jobs' GPU IDs

client.c

@@ -155,13 +155,7 @@ int c_wait_server_commands() {
                 if (command_line.gpus) {
                     char tmp[1024];
                     strcpy(tmp, "CUDA_VISIBLE_DEVICES=");
-                    for (int i = 0; i < num_gpus; i++) {
-                        char tmp2[512];
-                        sprintf(tmp2, "%d", freeGpuList[i]);
-                        strcat(tmp, tmp2);
-                        if (i < command_line.gpus - 1)
-                            strcat(tmp, ",");
-                    }
+                    strcat(tmp, ints_to_chars(freeGpuList, num_gpus, ","));
                     putenv(tmp);
                     free(freeGpuList);
                 } else {

jobs.c

@@ -463,6 +463,10 @@ int s_newjob(int s, struct Msg *m) {
     p->wait_free_gpus = m->u.newjob.wait_free_gpus;
     if (!p->wait_free_gpus)
         p->gpu_ids = recv_ints(s, &p->num_gpus);
+    else {
+        p->gpu_ids = (int *) malloc((p->num_gpus + 1) * sizeof(int));
+        memset(p->gpu_ids, -1, (p->num_gpus + 1) * sizeof(int));
+    }
 
     p->num_slots = m->u.newjob.num_slots;
     p->store_output = m->u.newjob.store_output;
@@ -973,6 +977,7 @@ void s_job_info(int s, int jobid) {
     fd_nprintf(s, 100, "\n");
     fd_nprintf(s, 100, "Slots required: %i\n", p->num_slots);
     fd_nprintf(s, 100, "GPUs required: %d\n", p->num_gpus);
+    fd_nprintf(s, 100, "GPU IDs: %s\n", ints_to_chars(p->gpu_ids, p->num_gpus ? p->num_gpus : 1, ","));
     fd_nprintf(s, 100, "Enqueue time: %s",
                ctime(&p->info.enqueue_time.tv_sec));
     if (p->state == RUNNING) {

main.h

@@ -426,6 +426,8 @@ char *joblistdump_headers();
 /* print.c */
 int fd_nprintf(int fd, int maxsize, const char *fmt, ...);
 
+char *ints_to_chars(int *array, int n, const char *delim);
+
 /* info.c */
 
 void pinfo_dump(const struct Procinfo *p, int fd);

print.c

@@ -49,3 +49,16 @@ int fd_nprintf(int fd, int maxsize, const char *fmt, ...)
 
     return size;
 }
+
+char *ints_to_chars(int *array, int n, const char *delim) {
+    char *tmp = malloc(n * sizeof(char) + n * strlen(delim) * sizeof(char) + 1);
+    int j = 0;
+    for (int i = 0; i < n; i++) {
+        j += sprintf(tmp + j, "%d", array[i]);
+        if (i < n - 1) {
+            strcat(tmp, delim);
+            j += strlen(delim);
+        }
+    }
+    return tmp;
+}