int
main(int argc, char **argv)
{
char *modp; /* ptr to module name */
int i; /* loop var & junk (what else?) */
boolean_t mod_present; /* B_TRUE if -m module */
boolean_t topmost; /* B_TRUE if -t */
struct str_mlist mlist[NMODULES]; /* modlist for strlist */
struct str_list strlist; /* mods on stream */
/*
* init
*/
Cmd_namep = argv[0];
mod_present = topmost = B_FALSE;
strlist.sl_nmods = NMODULES;
strlist.sl_modlist = mlist;
/*
* parse args
*/
if (argc > 1) {
while ((i = getopt(argc, argv, OPTLIST)) != -1) {
switch (i) {
case 'm': /* module present ? */
modp = optarg;
mod_present = B_TRUE;
break;
case 't': /* list topmost */
topmost = B_TRUE;
break;
default:
(void) fprintf(stderr, USAGE, Cmd_namep);
return (ERR_USAGE);
}
}
if (optind < argc) {
(void) fprintf(stderr, USAGE, Cmd_namep);
return (ERR_USAGE);
}
}
if (topmost && mod_present) {
(void) fprintf(stderr,
"%s: [-t] and [-m] options cannot be used together\n",
Cmd_namep);
(void) fprintf(stderr, USAGE, Cmd_namep);
return (ERR_USAGE);
}
/*
* get number of modules on stream
* allocate more room if needed
*/
if ((i = ioctl(STDIN_FILENO, I_LIST, NULL)) < 0) {
perror("I_LIST");
(void) fprintf(stderr,
"%s: I_LIST ioctl failed\n", Cmd_namep);
return (ERR_STDIN);
}
if (i > strlist.sl_nmods)
if (more_modules(&strlist, i) != SUCCESS)
return (ERR_MEM);
/*
* get list of modules on stream
*/
strlist.sl_nmods = i;
if (ioctl(STDIN_FILENO, I_LIST, &strlist) < 0) {
perror("I_LIST");
(void) fprintf(stderr, "%s: I_LIST ioctl failed\n", Cmd_namep);
return (ERR_STDIN);
}
/*
* list topmost module
*/
if (topmost) {
if (strlist.sl_nmods >= 2) {
(void) puts(strlist.sl_modlist[0].l_name);
return (SUCCESS);
}
return (ERR_MODULE);
}
/*
* check if module is present
*/
if (mod_present) {
for (i = 0; i < strlist.sl_nmods; i++) {
if (strncmp(modp, strlist.sl_modlist[i].l_name,
FMNAMESZ) == 0) {
(void) puts("yes");
return (SUCCESS);
}
}
(void) puts("no");
return (ERR_MODULE);
}
/*
* print names of all modules and topmost driver on stream
*/
for (i = 0; i < strlist.sl_nmods; i++)
(void) puts(strlist.sl_modlist[i].l_name);
return (SUCCESS);
}
int
main(int argc, char **argv)
{
char buf[BUFSIZ]; /* input buffer */
char *file_namep; /* file from -f opt */
char *modnamep; /* mods from -h or -u opt */
char *modp; /* for walking thru modnamep */
FILE *fp; /* file pointer for -f file */
int i; /* loop index and junk var */
int j; /* loop index and junk var */
int euid; /* effective uid */
short error; /* TRUE if usage error */
short fromfile; /* TRUE if -f file */
short is_a_tty; /* TRUE if TCGETA succeeds */
short pop; /* TRUE if -p */
short popall; /* TRUE if -p -a */
short popupto; /* TRUE if -p -u module */
short push; /* TRUE if -h mod1[,mod2 ...] */
struct str_mlist newmods[NMODULES]; /* mod list for new list */
struct stat stats; /* stream stats */
struct str_list newlist; /* modules to be pushed */
struct termio termio; /* save state of tty */
/*
* init
*/
Cmd_namep = argv[0];
error = fromfile = is_a_tty = pop = popall = popupto = push = FALSE;
Oldlist.sl_modlist = Oldmods;
Oldlist.sl_nmods = NMODULES;
newlist.sl_modlist = newmods;
newlist.sl_nmods = NMODULES;
/*
* only owner and root can change stream configuration
*/
if ((euid = geteuid()) != 0) {
if (fstat(0, &stats) < 0) {
perror("fstat");
(void) fprintf(stderr, "%s: fstat of stdin failed\n",
Cmd_namep);
return (ERR_STDIN);
}
if (euid != stats.st_uid) {
(void) fprintf(stderr,
"%s: not owner of stdin\n", Cmd_namep);
return (ERR_PERM);
}
}
/*
* parse args
*/
if (argc == 1) {
(void) fprintf(stderr, USAGE, Cmd_namep, Cmd_namep, Cmd_namep);
return (ERR_USAGE);
}
while (!error && (i = getopt(argc, argv, OPTLIST)) != -1) {
switch (i) {
case 'a': /* pop All */
if (fromfile || popupto || push)
error = TRUE;
else
popall = TRUE;
break;
case 'f': /* read from File */
if (pop || push)
error = TRUE;
else {
fromfile = TRUE;
file_namep = optarg;
}
break;
case 'h': /* pusH */
if (fromfile || pop)
error = TRUE;
else {
push = TRUE;
modnamep = optarg;
}
break;
case 'p': /* poP */
if (fromfile || push)
error = TRUE;
else
pop = TRUE;
break;
case 'u': /* pop Upto */
if (fromfile || popall || push)
error = TRUE;
else {
popupto = TRUE;
modnamep = optarg;
}
break;
default:
(void) fprintf(stderr,
USAGE, Cmd_namep, Cmd_namep, Cmd_namep);
return (ERR_USAGE);
/*NOTREACHED*/
}
}
if (error || optind < argc) {
(void) fprintf(stderr, USAGE, Cmd_namep, Cmd_namep, Cmd_namep);
return (ERR_USAGE);
}
if (!pop && (popall || popupto)) {
(void) fprintf(stderr,
"%s: -p option must be used with -a or -u to pop modules\n",
Cmd_namep);
(void) fprintf(stderr, USAGE, Cmd_namep, Cmd_namep, Cmd_namep);
return (ERR_USAGE);
}
/*
* Save state so can restore if something goes wrong
* (If are only going to push modules, don't need to
* save original module list for restore.)
*/
if (fromfile || pop) {
/*
* get number of modules on stream
* allocate more room if needed
*/
if ((i = ioctl(STDIN, I_LIST, NULL)) < 0) {
perror("I_LIST");
(void) fprintf(stderr,
"%s: I_LIST ioctl failed\n", Cmd_namep);
return (ERR_STDIN);
}
if (i > Oldlist.sl_nmods &&
more_modules(&Oldlist, i) != SUCCESS)
return (ERR_MEM);
/*
* get list of modules on stream
*/
Oldlist.sl_nmods = i;
if (ioctl(STDIN, I_LIST, &Oldlist) < 0) {
perror("I_LIST");
(void) fprintf(stderr,
"%s: I_LIST ioctl failed\n", Cmd_namep);
return (ERR_STDIN);
}
/*
* The following attempts to avoid leaving a
* terminal line that does not respond to anything
* if the strchg -h or -f options failed due to
* specifying invalid module names for pushing
*/
if (ioctl(STDIN, TCGETA, &termio) >= 0)
is_a_tty = TRUE;
}
/*
* push modules on stream
*/
if (push) {
/*
* pull mod names out of comma-separated list
*/
for (i = 0, modp = strtok(modnamep, ",");
modp != NULL; ++i, modp = strtok(NULL, ",")) {
if (push_module(modp) == FAILURE) {
/* pop the 'i' modules we just added */
restore(i, 0);
return (ERR_STDIN);
}
}
return (SUCCESS);
}
/*
* read configuration from a file
*/
if (fromfile) {
if ((fp = fopen(file_namep, "r")) == NULL) {
perror("fopen");
(void) fprintf(stderr,
"%s: could not open file '%s'\n",
Cmd_namep, file_namep);
return (ERR_OPEN);
}
/*
* read file and construct a new strlist
*/
i = 0;
while (fgets(buf, BUFSIZ, fp) != NULL) {
if (buf[0] == '#')
continue; /* skip comments */
/*
* skip trailing newline, trailing and leading
* whitespace
*/
if ((modp = strtok(buf, " \t\n")) == NULL)
continue; /* blank line */
(void) strncpy(newlist.sl_modlist[i].l_name,
modp, FMNAMESZ);
++i;
if ((modp = strtok(NULL, " \t\n")) != NULL) {
/*
* bad format
* should only be one name per line
*/
(void) fprintf(stderr,
"%s: error on line %d in file %s: "
"multiple module names??\n",
Cmd_namep, i, file_namep);
return (ERR_MODULE);
}
if (i > newlist.sl_nmods)
if (more_modules(&newlist, i) != SUCCESS)
return (ERR_MEM);
}
newlist.sl_nmods = i;
/*
* If an empty file, exit silently
*/
if (i == 0)
return (SUCCESS);
/*
* Pop all modules currently on the stream.
*/
if ((i = pop_modules(Oldlist.sl_nmods - 1))
!= (Oldlist.sl_nmods - 1)) {
/* put back whatever we've popped */
restore(0, i);
return (ERR_STDIN);
}
/*
* Push new modules
*/
for (i = newlist.sl_nmods - 1; i >= 0; --i) {
if (push_module(newlist.sl_modlist[i].l_name) ==
FAILURE) {
/*
* pop whatever new modules we've pushed
* then push old module list back on
*/
restore((newlist.sl_nmods - 1 - i),
(Oldlist.sl_nmods - 1));
/*
* If the stream is a tty line, at least try
* to set the state to what it was before.
*/
if (is_a_tty &&
ioctl(STDIN, TCSETA, &termio) < 0) {
perror("TCSETA");
(void) fprintf(stderr,
"%s: WARNING: Could not restore "
"the states of the terminal line "
"discipline\n", Cmd_namep);
}
return (ERR_STDIN);
}
}
return (SUCCESS);
} /* end if-fromfile */
/*
* pop all modules (except driver)
*/
if (popall) {
if (Oldlist.sl_nmods > 1) {
if ((i = pop_modules(Oldlist.sl_nmods - 1)) !=
(Oldlist.sl_nmods - 1)) {
restore(0, i);
return (ERR_STDIN);
}
}
return (SUCCESS);
}
/*
* pop up to (but not including) a module
*/
if (popupto) {
/*
* check that the module is in fact on the stream
*/
for (i = 0; i < Oldlist.sl_nmods; ++i)
if (strncmp(Oldlist.sl_modlist[i].l_name, modnamep,
FMNAMESZ) == 0)
break;
if (i == Oldlist.sl_nmods) {
/* no match found */
(void) fprintf(stderr, "%s: %s not found on stream\n",
Cmd_namep, modnamep);
return (ERR_MODULE);
}
if ((j = pop_modules(i)) != i) {
/* put back whatever we've popped */
restore(0, j);
return (ERR_STDIN);
}
return (SUCCESS);
}
/*
* pop the topmost module
*/
if (pop) {
if (Oldlist.sl_nmods > 1)
if (pop_modules(1) != 1)
/* no need to restore */
return (ERR_STDIN);
return (SUCCESS);
}
return (SUCCESS);
}
