From afcf3cd8ebff8fed79238a2d1b95338c4606b1ee Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Thu, 10 Nov 2016 09:28:00 -0200 Subject: New internal function __access_noerrno Implement an internal version of __access called __access_noerrno that avoids setting errno. This is useful to check accessibility of files very early on in process startup i.e. before TLS setup. This allows tunables to replace MALLOC_CHECK_ safely (i.e. check existence of /etc/suid-debug to enable/disable MALLOC_CHECK) and at the same time initialize very early so that it can override IFUNCs. Checked on x86_64. * hurd/hurd.h (__hurd_fail_noerrno): New function. * include/unistd.h [IS_IN (rtld) || !defined SHARED]: Declare __access_noerrno. * io/access.c (__access_noerrno): New function. * sysdeps/mach/hurd/access.c (hurd_fail_seterrno): New function. (hurd_fail_seterrno): Likewise. (access_common): Likewise. (__access_noerrno): Likewise. * sysdeps/nacl/access.c (__access_noerrno): Likewise. * sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise. * sysdeps/nacl/nacl-interfaces.h (NACL_CALL_NOERRNO): New macro. --- sysdeps/unix/sysv/linux/access.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'sysdeps/unix/sysv/linux/access.c') diff --git a/sysdeps/unix/sysv/linux/access.c b/sysdeps/unix/sysv/linux/access.c index 8f003df27c..adefbcaac6 100644 --- a/sysdeps/unix/sysv/linux/access.c +++ b/sysdeps/unix/sysv/linux/access.c @@ -20,6 +20,21 @@ #include #include +int +__access_noerrno (const char *file, int type) +{ + int res; + INTERNAL_SYSCALL_DECL (err); +#ifdef __NR_access + res = INTERNAL_SYSCALL_CALL (access, err, file, type); +#else + res = INTERNAL_SYSCALL_CALL (faccessat, err, AT_FDCWD, file, type); +#endif + if (INTERNAL_SYSCALL_ERROR_P (res, err)) + return INTERNAL_SYSCALL_ERRNO (res, err); + return 0; +} + int __access (const char *file, int type) { -- cgit 1.4.1