int get_pid_lib_path()

in helpers/uprobe_helpers.c [53:94]

• 37 lines of code
• 10 McCabe index (conditional complexity)

int get_pid_lib_path(pid_t pid, const char *lib, char *path, size_t path_sz)
{
	FILE *maps;
	char *p;
	char proc_pid_maps[32];
	char line_buf[1024];

	if (snprintf(proc_pid_maps, sizeof(proc_pid_maps), "/proc/%d/maps", pid)
	    >= sizeof(proc_pid_maps)) {
		warn("snprintf /proc/PID/maps failed");
		return -1;
	}
	maps = fopen(proc_pid_maps, "r");
	if (!maps) {
		warn("No such pid %d\n", pid);
		return -1;
	}
	while (fgets(line_buf, sizeof(line_buf), maps)) {
		if (sscanf(line_buf, "%*x-%*x %*s %*x %*s %*u %s", path) != 1)
			continue;
		/* e.g. /usr/lib/x86_64-linux-gnu/libc-2.31.so */
		p = strrchr(path, '/');
		if (!p)
			continue;
		if (strncmp(p, "/lib", 4))
			continue;
		p += 4;
		if (strncmp(lib, p, strlen(lib)))
			continue;
		p += strlen(lib);
		/* libraries can have - or . after the name */
		if (*p != '.' && *p != '-')
			continue;

		fclose(maps);
		return 0;
	}

	warn("Cannot find library %s\n", lib);
	fclose(maps);
	return -1;
}