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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
-rw-r--r--erts/emulator/sys/unix/sys.c10
-rw-r--r--erts/emulator/sys/win32/sys_env.c18
-rw-r--r--erts/emulator/test/bif_SUITE.erl10
-rw-r--r--lib/kernel/doc/src/os.xml11
-rw-r--r--lib/kernel/src/os.erl8
8 files changed, 78 insertions, 4 deletions
diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab
index dc8e9101de..6037c08dd8 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
#
# Obsolete
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);
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 401b37b9d2..61f9f6a59a 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -2489,6 +2489,16 @@ erts_sys_getenv(char *key, char *value, size_t *size)
return res;
}
+int
+erts_sys_unsetenv(char *key)
+{
+ int res;
+ erts_smp_rwmtx_rwlock(&environ_rwmtx);
+ res = unsetenv(key);
+ erts_smp_rwmtx_rwunlock(&environ_rwmtx);
+ return res;
+}
+
void
sys_init_io(void)
{
diff --git a/erts/emulator/sys/win32/sys_env.c b/erts/emulator/sys/win32/sys_env.c
index 754f4c6e4c..9f977ad6c8 100644
--- a/erts/emulator/sys/win32/sys_env.c
+++ b/erts/emulator/sys/win32/sys_env.c
@@ -141,6 +141,24 @@ void fini_getenv_state(GETENV_STATE *state)
erts_smp_rwmtx_runlock(&environ_rwmtx);
}
+int erts_sys_unsetenv(char *key)
+{
+ int res = 0;
+ WCHAR *wkey = (WCHAR *) key;
+
+ SetLastError(0);
+ erts_smp_rwmtx_rlock(&environ_rwmtx);
+ GetEnvironmentVariableW(wkey,
+ NULL,
+ 0);
+ if (GetLastError() != ERROR_ENVVAR_NOT_FOUND) {
+ res = (SetEnvironmentVariableW(wkey,
+ NULL) ? 0 : 1);
+ }
+ erts_smp_rwmtx_runlock(&environ_rwmtx);
+ return res;
+}
+
char*
win_build_environment(char* new_env)
{
diff --git a/erts/emulator/test/bif_SUITE.erl b/erts/emulator/test/bif_SUITE.erl
index 02c6de8cb1..8b612a145c 100644
--- a/erts/emulator/test/bif_SUITE.erl
+++ b/erts/emulator/test/bif_SUITE.erl
@@ -388,8 +388,12 @@ os_env(Config) when is_list(Config) ->
false -> ?line ok;
BadVal -> ?line ?t:fail(BadVal)
end,
- %% os:putenv and os:getenv currently uses a temp buf of size 1024
- %% for storing key+value
+ ?line true = os:putenv(EnvVar1, "mors"),
+ ?line true = os:unsetenv(EnvVar1),
+ ?line false = os:getenv(EnvVar1),
+ ?line true = os:unsetenv(EnvVar1), % unset unset variable
+ %% os:putenv, os:getenv and os:unsetenv currently use a temp
+ %% buffer of size 1024 for storing key+value
?line os_env_long(1010, 1030, "hej hopp").
os_env_long(Min, Max, _Value) when Min > Max ->
@@ -398,7 +402,7 @@ os_env_long(Min, Max, Value) ->
?line EnvVar = lists:duplicate(Min, $X),
?line true = os:putenv(EnvVar, Value),
?line Value = os:getenv(EnvVar),
- ?line true = os:putenv(EnvVar, ""),
+ ?line true = os:unsetenv(EnvVar),
?line os_env_long(Min+1, Max, Value).
otp_7526(doc) ->
diff --git a/lib/kernel/doc/src/os.xml b/lib/kernel/doc/src/os.xml
index 5e182de41d..9122267c40 100644
--- a/lib/kernel/doc/src/os.xml
+++ b/lib/kernel/doc/src/os.xml
@@ -177,6 +177,17 @@ format_utc_timestamp() ->
</desc>
</func>
<func>
+ <name name="unsetenv" arity="1"/>
+ <fsummary>Delete an environment variable</fsummary>
+ <desc>
+ <p>Deletes the environment variable <c><anno>VarName</anno></c>.</p>
+ <p>If Unicode filename encoding is in effect (see the <seealso
+ marker="erts:erl#file_name_encoding">erl manual
+ page</seealso>), the string (<c><anno>VarName</anno></c>) may
+ contain characters with codepoints > 255.</p>
+ </desc>
+ </func>
+ <func>
<name name="version" arity="0"/>
<fsummary>Return the Operating System version</fsummary>
<desc>
diff --git a/lib/kernel/src/os.erl b/lib/kernel/src/os.erl
index ded03361ee..9415593485 100644
--- a/lib/kernel/src/os.erl
+++ b/lib/kernel/src/os.erl
@@ -26,7 +26,7 @@
%%% BIFs
--export([getenv/0, getenv/1, getpid/0, putenv/2, timestamp/0]).
+-export([getenv/0, getenv/1, getpid/0, putenv/2, timestamp/0, unsetenv/1]).
-spec getenv() -> [string()].
@@ -58,6 +58,12 @@ putenv(_, _) ->
timestamp() ->
erlang:nif_error(undef).
+-spec unsetenv(VarName) -> true when
+ VarName :: string().
+
+unsetenv(_) ->
+ erlang:nif_error(undef).
+
%%% End of BIFs
-spec type() -> {Osfamily, Osname} when
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-28 11:38:41 +0000