Index: fusl/src/env/__libc_start_main.c |
diff --git a/fusl/src/env/__libc_start_main.c b/fusl/src/env/__libc_start_main.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..5c79be28f0b5c8205a53ad1f23510b57da9ca7d4 |
--- /dev/null |
+++ b/fusl/src/env/__libc_start_main.c |
@@ -0,0 +1,76 @@ |
+#include <elf.h> |
+#include <poll.h> |
+#include <fcntl.h> |
+#include <signal.h> |
+#include "syscall.h" |
+#include "atomic.h" |
+#include "libc.h" |
+ |
+void __init_tls(size_t *); |
+ |
+static void dummy(void) {} |
+weak_alias(dummy, _init); |
+ |
+__attribute__((__weak__, __visibility__("hidden"))) |
+extern void (*const __init_array_start)(void), (*const __init_array_end)(void); |
+ |
+static void dummy1(void *p) {} |
+weak_alias(dummy1, __init_ssp); |
+ |
+#define AUX_CNT 38 |
+ |
+void __init_libc(char **envp, char *pn) |
+{ |
+ size_t i, *auxv, aux[AUX_CNT] = { 0 }; |
+ __environ = envp; |
+ 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_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; |
+} |
+ |
+static void libc_start_init(void) |
+{ |
+ _init(); |
+ uintptr_t a = (uintptr_t)&__init_array_start; |
+ for (; a<(uintptr_t)&__init_array_end; a+=sizeof(void(*)())) |
+ (*(void (**)())a)(); |
+} |
+ |
+weak_alias(libc_start_init, __libc_start_init); |
+ |
+int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv) |
+{ |
+ char **envp = argv+argc+1; |
+ |
+ __init_libc(envp, argv[0]); |
+ __libc_start_init(); |
+ |
+ /* Pass control to the application */ |
+ exit(main(argc, argv, envp)); |
+ return 0; |
+} |