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Date: Mon, 15 Apr 2024 20:57:35 -0700
From: Michael Forney <mforney@...rney.org>
To: Jens Gustedt <Jens.Gustedt@...ia.fr>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] C23: update some legacy function pointers
Jens Gustedt <Jens.Gustedt@...ia.fr> wrote:
> In C23, empty parameter lists loose their meaning as "function that
> may receive any number of parameters".
>
> When compiling with -std=c2x, there were three left-overs in musl that
> still used that. Change them to use the correct prototype, since it is
> available at all these places, anyhow.
I think there's one more:
diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index 8294598b..e05f1623 100644
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -149,7 +149,7 @@ static int child(void *args_vp)
? &attr->__mask : &args->oldmask, 0);
int (*exec)(const char *, char *const *, char *const *) =
- attr->__fn ? (int (*)())attr->__fn : execve;
+ attr->__fn ? (int (*)(const char *, char *const *, char *const *))attr->__fn : execve;
exec(args->path, args->argv, args->envp);
ret = -errno;
Perhaps it's better to solve this by changing the type of __fn in
posix_spawnattr_t from void * to the appropriate function type, but
since this is in a public header, I'm not sure if it somehow breaks
something:
diff --git a/include/spawn.h b/include/spawn.h
index 8eb73e00..fec1280d 100644
--- a/include/spawn.h
+++ b/include/spawn.h
@@ -29,7 +29,7 @@ typedef struct {
pid_t __pgrp;
sigset_t __def, __mask;
int __prio, __pol;
- void *__fn;
+ int (*__fn)(const char *, char *const *, char *const *);
char __pad[64-sizeof(void *)];
} posix_spawnattr_t;
diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index 8294598b..2611fb94 100644
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -149,7 +149,7 @@ static int child(void *args_vp)
? &attr->__mask : &args->oldmask, 0);
int (*exec)(const char *, char *const *, char *const *) =
- attr->__fn ? (int (*)())attr->__fn : execve;
+ attr->__fn ? attr->__fn : execve;
exec(args->path, args->argv, args->envp);
ret = -errno;
diff --git a/src/process/posix_spawnp.c b/src/process/posix_spawnp.c
index aad6133b..28ef1aa4 100644
--- a/src/process/posix_spawnp.c
+++ b/src/process/posix_spawnp.c
@@ -8,6 +8,6 @@ int posix_spawnp(pid_t *restrict res, const char *restrict file,
{
posix_spawnattr_t spawnp_attr = { 0 };
if (attr) spawnp_attr = *attr;
- spawnp_attr.__fn = (void *)__execvpe;
+ spawnp_attr.__fn = __execvpe;
return posix_spawn(res, file, fa, &spawnp_attr, argv, envp);
}
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