X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=src%2Fenv%2F__libc_start_main.c;h=10e559096a703202070da2eb95157487f588b937;hb=5cc187215681c2fc1563ad5136c389249aa3f70e;hp=f31222b226b7e31b2b3d02a72880afd13e721244;hpb=df0b5a49406763aa4719dfad561a5de8924ecd59;p=musl

diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index f31222b2..10e55909 100644
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -1,26 +1,78 @@
+#include <elf.h>
+#include <poll.h>
+#include <fcntl.h>
+#include <signal.h>
+#include "syscall.h"
+#include "atomic.h"
 #include "libc.h"
 
-void __init_security(size_t *);
+void __init_tls(size_t *);
 
-int __libc_start_main(
-	int (*main)(int, char **, char **), int argc, char **argv,
-	int (*init)(int, char **, char **), void (*fini)(void),
-	void (*ldso_fini)(void))
-{
-	char **envp = argv+argc+1, **auxv = envp;
+#ifndef SHARED
+static void dummy() {}
+weak_alias(dummy, _init);
+extern void (*const __init_array_start)() __attribute__((weak));
+extern void (*const __init_array_end)() __attribute__((weak));
+#endif
+
+static void dummy1(void *p) {}
+weak_alias(dummy1, __init_ssp);
+
+#define AUX_CNT 38
 
+extern size_t __hwcap, __sysinfo;
+extern char *__progname, *__progname_full;
+
+#ifndef SHARED
+static
+#endif
+void __init_libc(char **envp, char *pn)
+{
+	size_t i, *auxv, aux[AUX_CNT] = { 0 };
 	__environ = envp;
-	do auxv++; while (*auxv);
-	libc.auxv = (void *)++auxv;
-	libc.ldso_fini = ldso_fini;
-	libc.fini = fini;
+	for (i=0; envp[i]; i++);
+	libc.auxv = auxv = (void *)(envp+i+1);
+	for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) aux[auxv[i]] = auxv[i+1];
+	__hwcap = aux[AT_HWCAP];
+	__sysinfo = aux[AT_SYSINFO];
+	libc.page_size = aux[AT_PAGESZ];
+
+	if (pn) {
+		__progname = __progname_full = pn;
+		for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
+	}
 
-	__init_security((void *)auxv);
+	__init_tls(aux);
+	__init_ssp((void *)aux[AT_RANDOM]);
+
+	if (aux[AT_UID]==aux[AT_EUID] && aux[AT_GID]==aux[AT_EGID]
+		&& !aux[AT_SECURE]) return;
+
+	struct pollfd pfd[3] = { {.fd=0}, {.fd=1}, {.fd=2} };
+#ifdef SYS_poll
+	__syscall(SYS_poll, pfd, 3, 0);
+#else
+	__syscall(SYS_ppoll, pfd, 3, &(struct timespec){0}, 0, _NSIG/8);
+#endif
+	for (i=0; i<3; i++) if (pfd[i].revents&POLLNVAL)
+		if (__sys_open("/dev/null", O_RDWR)<0)
+			a_crash();
+	libc.secure = 1;
+}
+
+int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv)
+{
+	char **envp = argv+argc+1;
 
-	/* Execute constructors (static) linked into the application */
-	if (init) init(argc, argv, envp);
+#ifndef SHARED
+	__init_libc(envp, argv[0]);
+	_init();
+	uintptr_t a = (uintptr_t)&__init_array_start;
+	for (; a<(uintptr_t)&__init_array_end; a+=sizeof(void(*)()))
+		(*(void (**)())a)();
+#endif
 
-	/* Pass control to to application */
+	/* Pass control to the application */
 	exit(main(argc, argv, envp));
 	return 0;
 }