Function malloc_conf_init

app/redis-6.2.6/deps/jemalloc/src/jemalloc.c:871–1246

}

static void
malloc_conf_init(void) {
	unsigned i;
	char buf[PATH_MAX + 1];
	const char *opts, *k, *v;
	size_t klen, vlen;

	for (i = 0; i < 4; i++) {
		/* Get runtime configuration. */
		switch (i) {
		case 0:
			opts = config_malloc_conf;
			break;
		case 1:
			if (je_malloc_conf != NULL) {
				/*
				 * Use options that were compiled into the
				 * program.
				 */
				opts = je_malloc_conf;
			} else {
				/* No configuration specified. */
				buf[0] = '\0';
				opts = buf;
			}
			break;
		case 2: {
			ssize_t linklen = 0;
#ifndef _WIN32
			int saved_errno = errno;
			const char *linkname =
#  ifdef JEMALLOC_PREFIX
			    "/etc/"JEMALLOC_PREFIX"malloc.conf"
#  else
			    "/etc/malloc.conf"
#  endif
			    ;

			/*
			 * Try to use the contents of the "/etc/malloc.conf"
			 * symbolic link's name.
			 */
			linklen = readlink(linkname, buf, sizeof(buf) - 1);
			if (linklen == -1) {
				/* No configuration specified. */
				linklen = 0;
				/* Restore errno. */
				set_errno(saved_errno);
			}
#endif
			buf[linklen] = '\0';
			opts = buf;
			break;
		} case 3: {
			const char *envname =
#ifdef JEMALLOC_PREFIX
			    JEMALLOC_CPREFIX"MALLOC_CONF"
#else