static unsigned long read_proc_value(const char *path)
{
int ret, fd;
+ ssize_t size_ret;
long r_val;
unsigned long val = 0;
char buf[64];
goto error;
}
- ret = read(fd, buf, sizeof(buf));
- if (ret < 0) {
+ size_ret = lttng_read(fd, buf, sizeof(buf));
+ /*
+ * Allow reading a file smaller than buf, but keep space for
+ * final \0.
+ */
+ if (size_ret < 0 || size_ret >= sizeof(buf)) {
PERROR("read proc failed");
goto error_close;
}
+ buf[size_ret] = '\0';
errno = 0;
r_val = strtol(buf, NULL, 10);