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/*
* lspci - written by Isaac Dunham
USE_LSPCI(NEWTOY(lspci, "emkn", TOYFLAG_USR|TOYFLAG_BIN))
config LSPCI
bool "lspci"
default n
help
usage: lspci [-ekmn]
List PCI devices.
-e Output all 6 digits in class (like elspci)
-k Print kernel driver
-m Machine parseable format
-n Numeric output (default)
*/
#define FOR_lspci
#include "toys.h"
char * preadat_name(int dirfd, char *fname, size_t nbyte, off_t offset)
{
int fd;
char *buf = malloc(nbyte+1);
memset(buf, 0, sizeof(buf));
fd = openat(dirfd, fname, O_RDONLY);
if (fd < 0) {
return NULL;
}
lseek(fd, offset, SEEK_SET);
read(fd, buf, nbyte);
close(fd);
buf[nbyte +1] = '\0';
return buf;
}
int do_lspci(struct dirtree *new)
{
int alen = 8;
char *dname = dirtree_path(new, &alen);
errno = 0;
int dirfd = open(dname, O_RDONLY);
if (dirfd > 0) {
char *class = preadat_name(dirfd, "class",
(toys.optflags & FLAG_e) ? 6 :4, 2);
char *vendor = preadat_name(dirfd, "vendor", 4, 2);
char *device = preadat_name(dirfd, "device", 4, 2);
close(dirfd);
if (!errno) {
char *driver = "";
if (toys.optflags & FLAG_k) {
char module[256] = "";
strcat(dname, "/driver");
readlink(dname, module, sizeof(module));
driver = basename(module);
}
if (toys.optflags & FLAG_m) {
printf("%s, \"%s\" \"%s\" \"%s\" \"%s\"\n",new->name + 5, class,
vendor, device, driver);
} else {
printf("%s Class %s: %s:%s %s\n", new->name + 5, class, vendor, device,
driver);
}
}
}
if (!strcmp("/sys/bus/pci/devices", new->name)) {
return DIRTREE_RECURSE;
}
return 0;
}
void lspci_main(void)
{
sprintf(toybuf, "/sys/bus/pci/devices");
dirtree_read(toybuf, do_lspci);
}
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