erts: Make key argument constant for erl_drv_{get|put}env

This should be a harmless and compatible API change.

4 files changed, 10 insertions, 10 deletions

diff --git a/erts/doc/src/erl_driver.xml b/erts/doc/src/erl_driver.xml
index 1f7fe0f961..d829aeda10 100644
--- a/erts/doc/src/erl_driver.xml
+++ b/erts/doc/src/erl_driver.xml
@@ -2811,7 +2811,7 @@ ERL_DRV_MAP          int sz
     </func>
 
     <func>
-      <name><ret>int</ret><nametext>erl_drv_putenv(char *key, char *value)</nametext></name>
+      <name><ret>int</ret><nametext>erl_drv_putenv(const char *key, char *value)</nametext></name>
       <fsummary>Set the value of an environment variable</fsummary>
       <desc>
         <marker id="erl_drv_putenv"></marker>
@@ -2840,7 +2840,7 @@ ERL_DRV_MAP          int sz
       </desc>
     </func>
     <func>
-      <name><ret>int</ret><nametext>erl_drv_getenv(char *key, char *value, size_t *value_size)</nametext></name>
+      <name><ret>int</ret><nametext>erl_drv_getenv(const char *key, char *value, size_t *value_size)</nametext></name>
       <fsummary>Get the value of an environment variable</fsummary>
       <desc>
         <marker id="erl_drv_getenv"></marker>
diff --git a/erts/emulator/beam/erl_driver.h b/erts/emulator/beam/erl_driver.h
index 6b406d069c..dbb4d719c1 100644
--- a/erts/emulator/beam/erl_driver.h
+++ b/erts/emulator/beam/erl_driver.h
@@ -696,8 +696,8 @@ EXTERN int driver_dl_close(void *);
 EXTERN char *driver_dl_error(void);
 
 /* environment */
-EXTERN int erl_drv_putenv(char *key, char *value);
-EXTERN int erl_drv_getenv(char *key, char *value, size_t *value_size);
+EXTERN int erl_drv_putenv(const char *key, char *value);
+EXTERN int erl_drv_getenv(const char *key, char *value, size_t *value_size);
 
 #ifdef __OSE__
 typedef ErlDrvUInt ErlDrvOseEventId;
diff --git a/erts/emulator/beam/io.c b/erts/emulator/beam/io.c
index 900616c981..c64c8802b9 100644
--- a/erts/emulator/beam/io.c
+++ b/erts/emulator/beam/io.c
@@ -7596,15 +7596,15 @@ int null_func(void)
 }
 
 int
-erl_drv_putenv(char *key, char *value)
+erl_drv_putenv(const char *key, char *value)
 {
-    return erts_sys_putenv_raw(key, value);
+    return erts_sys_putenv_raw((char*)key, value);
 }
 
 int
-erl_drv_getenv(char *key, char *value, size_t *value_size)
+erl_drv_getenv(const char *key, char *value, size_t *value_size)
 {
-    return erts_sys_getenv_raw(key, value, value_size);
+    return erts_sys_getenv_raw((char*)key, value, value_size);
 }
 
 /* get heart_port
diff --git a/erts/emulator/sys/win32/erl_win_dyn_driver.h b/erts/emulator/sys/win32/erl_win_dyn_driver.h
index 5e62320be4..baac7c903e 100644
--- a/erts/emulator/sys/win32/erl_win_dyn_driver.h
+++ b/erts/emulator/sys/win32/erl_win_dyn_driver.h
@@ -145,8 +145,8 @@ WDD_TYPEDEF(ErlDrvTid, erl_drv_thread_self, (void));
 WDD_TYPEDEF(int, erl_drv_equal_tids, (ErlDrvTid tid1, ErlDrvTid tid2));
 WDD_TYPEDEF(void, erl_drv_thread_exit, (void *resp));
 WDD_TYPEDEF(int, erl_drv_thread_join, (ErlDrvTid, void **respp));
-WDD_TYPEDEF(int, erl_drv_putenv, (char *key, char *value));
-WDD_TYPEDEF(int, erl_drv_getenv, (char *key, char *value, size_t *value_size));
+WDD_TYPEDEF(int, erl_drv_putenv, (const char *key, char *value));
+WDD_TYPEDEF(int, erl_drv_getenv, (const char *key, char *value, size_t *value_size));
 
 typedef struct {
     WDD_FTYPE(null_func) *null_func;