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add a callback mechanism for code that wants to defer committing changes

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until all the command line args have been processed

Reviewed by:	ambrisko
This commit is contained in:
Sam Leffler 2004-12-11 02:33:33 +00:00
parent 3064e7b052
commit 58ac5e5b7a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=138671
2 changed files with 33 additions and 0 deletions
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30
sbin/ifconfig/ifconfig.c
View File

@ -446,6 +446,27 @@ cmd_lookup(const char *name)
#undef N
}
struct callback {
callback_func *cb_func;
void *cb_arg;
struct callback *cb_next;
};
static struct callback *callbacks = NULL;
void
callback_register(callback_func *func, void *arg)
{
struct callback *cb;
cb = malloc(sizeof(struct callback));
if (cb == NULL)
errx(1, "unable to allocate memory for callback");
cb->cb_func = func;
cb->cb_arg = arg;
cb->cb_next = callbacks;
callbacks = cb;
}
/* specially-handled comamnds */
static void setifaddr(const char *, int, int, const struct afswtch *);
static const struct cmd setifaddr_cmd = DEF_CMD("ifaddr", 0, setifaddr);
@ -457,6 +478,7 @@ static const struct cmd setifdstaddr_cmd =
static int
ifconfig(int argc, char *const *argv, const struct afswtch *afp)
{
struct callback *cb;
int s;
if (afp == NULL)
@ -541,6 +563,14 @@ ifconfig(int argc, char *const *argv, const struct afswtch *afp)
if (ioctl(s, afp->af_aifaddr, afp->af_addreq) < 0)
Perror("ioctl (SIOCAIFADDR)");
}
/*
* Do deferred callbacks registered while processing
* command-line arguments.
*/
for (cb = callbacks; cb != NULL; cb = cb->cb_next)
cb->cb_func(s, cb->cb_arg);
close(s);
return(0);
}

3
sbin/ifconfig/ifconfig.h
View File

@ -56,6 +56,9 @@ struct cmd {
};
void cmd_register(struct cmd *);
typedef void callback_func(int s, void *);
void callback_register(callback_func *, void *);
/*
* Macros for declaring command functions and initializing entries.
*/