static int read_to_buf(const char *filename, void *buf)
{
ssize_t ret;
ret = open_read_close(filename, buf, PROCPS_BUFSIZE-1);
((char *)buf)[ret > 0 ? ret : 0] = '\0';
return ret;
}
static unsigned long get_uptime(void)
{
#ifdef __linux__
struct sysinfo info;
if (sysinfo(&info) < 0)
return 0;
return info.uptime;
#elif 1
unsigned long uptime;
char buf[sizeof(uptime)*3 + 2];
/* /proc/uptime is "UPTIME_SEC.NN IDLE_SEC.NN\n"
* (where IDLE is cumulative over all CPUs)
*/
if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
bb_perror_msg_and_die("can't read '%s'", "/proc/uptime");
buf[sizeof(buf)-1] = '\0';
sscanf(buf, "%lu", &uptime);
return uptime;
#else
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
return 0;
return ts.tv_sec;
#endif
}
static unsigned get_num_from_file(const char *path, unsigned max, const char *errmsg)
{
char buf[sizeof(long long)*3];
unsigned long long num;
if (open_read_close(path, buf, sizeof(buf)) < 0)
bb_perror_msg_and_die(errmsg, path);
/* It can be \n terminated, xatoull won't work well */
if (sscanf(buf, "%llu", &num) != 1 || num > max)
bb_error_msg_and_die(errmsg, path);
return num;
}
static NOINLINE pid_t read_pid(const char *filename)
{
int len;
char buf[128];
len = open_read_close(filename, buf, 127);
if (len > 0) {
buf[len] = '\0';
/* returns ULONG_MAX on error => -1 */
return bb_strtoul(buf, NULL, 10);
}
return 0;
}
static int pid_is_exec(pid_t pid)
{
ssize_t bytes;
char buf[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
bytes = open_read_close(buf, G.execname_cmpbuf, G.execname_sizeof);
if (bytes > 0) {
G.execname_cmpbuf[bytes] = '\0';
return strcmp(execname, G.execname_cmpbuf) == 0;
}
return 0;
}
static NOINLINE bool may_wakeup(const char *rtcname)
{
ssize_t ret;
char buf[128];
/* strip "/dev/" from the rtcname here */
rtcname = skip_dev_pfx(rtcname);
snprintf(buf, sizeof(buf), SYS_RTC_PATH, rtcname);
ret = open_read_close(buf, buf, sizeof(buf));
if (ret < 0)
return false;
/* wakeup events could be disabled or not supported */
return strncmp(buf, "enabled\n", 8) == 0;
}
static int may_wakeup(const char *rtcname)
{
ssize_t ret;
char buf[128];
/* strip the '/dev/' from the rtcname here */
if (!strncmp(rtcname, "/dev/", 5))
rtcname += 5;
snprintf(buf, sizeof(buf), SYS_RTC_PATH, rtcname);
ret = open_read_close(buf, buf, sizeof(buf));
if (ret < 0)
return 0;
/* wakeup events could be disabled or not supported */
return strncmp(buf, "enabled\n", 8) == 0;
}
static long get_uptime(void)
{
#ifdef __linux__
struct sysinfo info;
if (sysinfo(&info) < 0)
return 0;
return info.uptime;
#elif 1
char buf[64];
long uptime;
if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
bb_perror_msg_and_die("can't read %s", "/proc/uptime");
buf[sizeof(buf)-1] = '\0';
sscanf(buf, "%l", &uptime);
return uptime;
#else
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
return 0;
return ts.tv_sec;
#endif
}
static int pid_is_exec(pid_t pid)
{
ssize_t bytes;
char buf[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
char *procname, *exelink;
int match;
procname = buf + sprintf(buf, "/proc/%u/exe", (unsigned)pid) - 3;
exelink = xmalloc_readlink(buf);
match = (exelink && strcmp(execname, exelink) == 0);
free(exelink);
if (match)
return match;
strcpy(procname, "cmdline");
bytes = open_read_close(buf, G.execname_cmpbuf, G.execname_sizeof);
if (bytes > 0) {
G.execname_cmpbuf[bytes] = '\0';
return strcmp(execname, G.execname_cmpbuf) == 0;
}
return 0;
}
static int pid_is_name(pid_t pid)
{
/* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
char buf[32]; /* should be enough */
char *p, *pe;
sprintf(buf, "/proc/%u/stat", (unsigned)pid);
if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
return 0;
buf[sizeof(buf) - 1] = '\0'; /* paranoia */
p = strchr(buf, '(');
if (!p)
return 0;
pe = strrchr(++p, ')');
if (!pe)
return 0;
*pe = '\0';
/* we require comm to match and to not be truncated */
/* in Linux, if comm is 15 chars, it may be a truncated
* name, so we don't allow that to match */
if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
return 0;
return strcmp(p, cmdname) == 0;
}
static void
dev_get_major_minor(char *device_name, int *major, int *minor)
{
char dev[16];
char *dev_path;
char *colon;
int sz;
dev_path = xasprintf("/sys/block/%s/dev", device_name);
sz = open_read_close(dev_path, dev, sizeof(dev) - 1);
if (sz < 0)
goto ret;
dev[sz] = '\0';
colon = strchr(dev, ':');
if (!colon)
goto ret;
*major = bb_strtou(dev, NULL, 10);
*minor = bb_strtou(colon + 1, NULL, 10);
ret:
free(dev_path);
return;
}
