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-rw-r--r--erts/emulator/beam/bif.tab1
-rw-r--r--erts/emulator/beam/erl_bif_os.c22
-rw-r--r--erts/emulator/beam/sys.h2
3 files changed, 25 insertions, 0 deletions
diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab
index 7c8e4b31cf..b6cce84cdd 100644
--- a/erts/emulator/beam/bif.tab
+++ b/erts/emulator/beam/bif.tab
@@ -572,6 +572,7 @@ bif erlang:float_to_binary/2
bif erlang:binary_to_float/1
bif io:printable_range/0
+bif os:unsetenv/1
#
# New in R17A
diff --git a/erts/emulator/beam/erl_bif_os.c b/erts/emulator/beam/erl_bif_os.c
index 1062d4379b..e07c622928 100644
--- a/erts/emulator/beam/erl_bif_os.c
+++ b/erts/emulator/beam/erl_bif_os.c
@@ -180,3 +180,25 @@ BIF_RETTYPE os_putenv_2(BIF_ALIST_2)
BIF_RET(am_true);
}
+BIF_RETTYPE os_unsetenv_1(BIF_ALIST_1)
+{
+ char *key_buf;
+ char buf[STATIC_BUF_SIZE];
+
+ key_buf = erts_convert_filename_to_native(BIF_ARG_1,buf,STATIC_BUF_SIZE,
+ ERTS_ALC_T_TMP,0,0,NULL);
+ if (!key_buf) {
+ BIF_ERROR(BIF_P, BADARG);
+ }
+
+ if (erts_sys_unsetenv(key_buf)) {
+ if (key_buf != buf) {
+ erts_free(ERTS_ALC_T_TMP, key_buf);
+ }
+ BIF_ERROR(BIF_P, BADARG);
+ }
+ if (key_buf != buf) {
+ erts_free(ERTS_ALC_T_TMP, key_buf);
+ }
+ BIF_RET(am_true);
+}
diff --git a/erts/emulator/beam/sys.h b/erts/emulator/beam/sys.h
index 9561c0be96..d22f125945 100644
--- a/erts/emulator/beam/sys.h
+++ b/erts/emulator/beam/sys.h
@@ -750,6 +750,8 @@ int erts_sys_getenv(char *key, char *value, size_t *size);
int erts_sys_getenv_raw(char *key, char *value, size_t *size);
/* erts_sys_getenv__() is only allowed to be used in early init phase */
int erts_sys_getenv__(char *key, char *value, size_t *size);
+/* erst_sys_unsetenv() returns 0 on success and a value != 0 on failure. */
+int erts_sys_unsetenv(char *key);
/* Easier to use, but not as efficient, environment functions */
char *erts_read_env(char *key);