imv: Add imv_pid environment variable

2 files changed, 6 insertions, 0 deletions

diff --git a/doc/imv.1.txt b/doc/imv.1.txt
index 6474036..98b4498 100644
--- a/doc/imv.1.txt
+++ b/doc/imv.1.txt
@@ -161,6 +161,9 @@ When imv executes a shell command, it provides a number of environment variables
 exposing imv's state. These environment variables are also available when
 customising the window's title, or the overlay text.
 
+*$imv_pid*::
+	The pid of this instance of imv. Useful for running imv-msg in scripts.
+
 *$imv_current_file*::
 	Path of currently selected image.
 
diff --git a/src/imv.c b/src/imv.c
index 2d948fa..0f42371 100644
--- a/src/imv.c
+++ b/src/imv.c
@@ -1675,6 +1675,9 @@ static void update_env_vars(struct imv *imv)
 {
   char str[64];
 
+  snprintf(str, sizeof str, "%d", getpid());
+  setenv("imv_pid", str, 1);
+
   setenv("imv_current_file", imv_navigator_selection(imv->navigator), 1);
   setenv("imv_scaling_mode", scaling_label[imv->scaling_mode], 1);
   setenv("imv_loading", imv->loading ? "1" : "0", 1);