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Implement --hints to read hints file directly

Browse source 
In testing, it's often useful to copy a few files into a directory and
kldxref them to ensure that particular cases are handled correctly.
Add --hints (-h) to facilitate this testing and enable future
automated testing.

Sponsored by: Netflix
This commit is contained in:
Warner Losh 2018-02-17 06:57:43 +00:00
parent 247f52f185
commit 3fa2c0489b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329446
2 changed files with 68 additions and 37 deletions
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13
sbin/devmatch/devmatch.8
View file

@ -33,10 +33,11 @@
.Nd print information about unattached devices
.Sh SYNOPSIS
.Nm
.Op Fl adpuv
.Op Fl adhpuv
.Op Fl -all
.Op Fl -dump
.Op Fl -nomatch
.Op Fl -hints Ar file
.Op Fl -nomatch Ar event
.Op Fl -unbound
.Op Fl -verbose
.Sh DESCRIPTION
@ -51,7 +52,13 @@ Include all devices, not just the ones that are unattached.
Produce a human readable dump of the
.Pa linker.hints
file.
.It Fl p Fl -nomatch
.It Fl h Fl -hints Ar file
Use the named
.Ar file
instead of
.Pa linker.hints
guessed from the current module load path.
.It Fl p Fl -nomatch Ar event
Parse and use a standard NOMATCH event from
.Xr devd 8
for matching instead of searching the device tree.

92
sbin/devmatch/devmatch.c
View file

@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
static struct option longopts[] = {
{ "all", no_argument, NULL, 'a' },
{ "dump", no_argument, NULL, 'd' },
{ "hints", required_argument, NULL, 'h' },
{ "nomatch", required_argument, NULL, 'p' },
{ "unbound", no_argument, NULL, 'u' },
{ "verbose", no_argument, NULL, 'v' },
@ -55,6 +56,7 @@ static struct option longopts[] = {
static int all_flag;
static int dump_flag;
static char *linker_hints;
static char *nomatch_str;
static int unbound_flag;
static int verbose_flag;
@ -62,47 +64,66 @@ static int verbose_flag;
static void *hints;
static void *hints_end;
static void *
read_hints(const char *fn, size_t *len)
{
void *h;
int fd;
struct stat sb;
fd = open(fn, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return NULL;
err(1, "Can't open %s for reading", fn);
}
if (fstat(fd, &sb) != 0)
err(1, "Can't fstat %s\n", fn);
h = malloc(sb.st_size);
if (h == NULL)
err(1, "not enough space to read hints file of %ju bytes", (uintmax_t)sb.st_size);
if (read(fd, h, sb.st_size) != sb.st_size)
err(1, "Can't read in %ju bytes from %s", (uintmax_t)sb.st_size, fn);
close(fd);
*len = sb.st_size;
return h;
}
static void
read_linker_hints(void)
{
char fn[MAXPATHLEN];
struct stat sb;
char *modpath, *p, *q;
size_t buflen;
int fd;
size_t buflen, len;
if (sysctlbyname("kern.module_path", NULL, &buflen, NULL, 0) < 0)
errx(1, "Can't find kernel module path.");
modpath = malloc(buflen);
if (modpath == NULL)
err(1, "Can't get memory for modpath.");
if (sysctlbyname("kern.module_path", modpath, &buflen, NULL, 0) < 0)
errx(1, "Can't find kernel module path.");
p = modpath;
while ((q = strsep(&p, ";")) != NULL) {
snprintf(fn, sizeof(fn), "%s/linker.hints", q);
fd = open(fn, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
if (linker_hints == NULL) {
if (sysctlbyname("kern.module_path", NULL, &buflen, NULL, 0) < 0)
errx(1, "Can't find kernel module path.");
modpath = malloc(buflen);
if (modpath == NULL)
err(1, "Can't get memory for modpath.");
if (sysctlbyname("kern.module_path", modpath, &buflen, NULL, 0) < 0)
errx(1, "Can't find kernel module path.");
p = modpath;
while ((q = strsep(&p, ";")) != NULL) {
snprintf(fn, sizeof(fn), "%s/linker.hints", q);
hints = read_hints(fn, &len);
if (hints == NULL)
continue;
err(1, "Can't open %s for reading", fn);
break;
}
if (fstat(fd, &sb) != 0)
err(1, "Can't fstat %s\n", fn);
hints = malloc(sb.st_size);
if (q == NULL) {
warnx("Can't read linker hints file.");
free(hints);
hints = NULL;
return;
}
} else {
hints = read_hints(linker_hints, &len);
if (hints == NULL)
err(1, "not enough space to read hints file of %ju bytes", (uintmax_t)sb.st_size);
if (read(fd, hints, sb.st_size) != sb.st_size)
err(1, "Can't read in %ju bytes from %s", (uintmax_t)sb.st_size, fn);
close(fd);
break;
}
if (q == NULL) {
warnx("Can't read linker hints file.");
free(hints);
hints = NULL;
return;
err(1, "Can't open %s for reading", fn);
}
if (*(int *)(intptr_t)hints != LINKER_HINTS_VERSION) {
warnx("Linker hints version %d doesn't match expected %d.",
*(int *)(intptr_t)hints, LINKER_HINTS_VERSION);
@ -110,7 +131,7 @@ read_linker_hints(void)
hints = NULL;
}
if (hints != NULL)
hints_end = (void *)((intptr_t)hints + (intptr_t)sb.st_size);
hints_end = (void *)((intptr_t)hints + (intptr_t)len);
}
static int
@ -443,7 +464,7 @@ static void
usage(void)
{
errx(1, "devmatch [-adv]");
errx(1, "devmatch [-adv] [-p nomatch] [-h linker-hints]");
}
int
@ -452,7 +473,7 @@ main(int argc, char **argv)
struct devinfo_dev *root;
int ch;
while ((ch = getopt_long(argc, argv, "adp:uv",
while ((ch = getopt_long(argc, argv, "adh:p:uv",
longopts, NULL)) != -1) {
switch (ch) {
case 'a':
@ -461,6 +482,9 @@ main(int argc, char **argv)
case 'd':
dump_flag++;
break;
case 'h':
linker_hints = optarg;
break;
case 'p':
nomatch_str = optarg;
break;