diff options
Diffstat (limited to 'sysdeps/unix')
-rw-r--r-- | sysdeps/unix/sysv/linux/getcwd.c | 59 | ||||
-rw-r--r-- | sysdeps/unix/sysv/linux/i386/chown.c | 12 | ||||
-rw-r--r-- | sysdeps/unix/sysv/linux/i386/i686/sysdep.h | 71 | ||||
-rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysdep.h | 4 |
4 files changed, 138 insertions, 8 deletions
diff --git a/sysdeps/unix/sysv/linux/getcwd.c b/sysdeps/unix/sysv/linux/getcwd.c index ed649f8fef..0bf9a9fb0e 100644 --- a/sysdeps/unix/sysv/linux/getcwd.c +++ b/sysdeps/unix/sysv/linux/getcwd.c @@ -1,5 +1,5 @@ /* Determine current working directory. Linux version. - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -22,6 +22,7 @@ #include <limits.h> #include <stdlib.h> #include <unistd.h> +#include <sys/syscall.h> /* The "proc" filesystem provides an easy method to retrieve the value. @@ -31,10 +32,20 @@ the proc filesystem mounted. Use the POSIX implementation in this case. */ static char *generic_getcwd (char *buf, size_t size) internal_function; +#ifdef __NR_getcwd +/* Kernel 2.1.92 introduced a third way to get the current working + directory: a syscall. We've got to be careful that even when + compiling under 2.1.92+ the libc still runs under older kernels. */ +extern int __syscall_getcwd (char *buf, unsigned long size); +static no_syscall_getcwd; +static int no_new_dcache = 1; +#else +static int no_new_dcache; +#endif + char * __getcwd (char *buf, size_t size) { - static int no_new_dcache = 0; int save_errno; char *path; int n; @@ -66,6 +77,41 @@ __getcwd (char *buf, size_t size) save_errno = errno; +#ifdef __NR_getcwd + if (!no_syscall_getcwd) + { + int retval; + + do + retval = __syscall_getcwd (path, alloc_size); + if (retval >= 0) + { + if (buf == NULL) + { + buf = realloc (path, strlen (path) + 1); + if (buf == NULL) + /* `relloc' failed but we still have the original string. */ + buf = path; + } + return buf; + } + + if (errno == ENOSYS) + { + no_syscall_getcwd = 1; + no_new_dcache = 0; /* Now we will try the /proc method. */ + } + else if (errno != ERANGE || buf != NULL) + { + if (buf == NULL) + free (path); + return NULL; + } + + __set_errno (save_errno); + } +#endif + n = __readlink ("/proc/self/cwd", path, alloc_size - 1); if (n != -1) { @@ -79,7 +125,14 @@ __getcwd (char *buf, size_t size) } path[n] = '\0'; - return buf ?: (char *) realloc (path, (size_t) n + 1); + if (buf == NULL) + { + buf = realloc (path, (size_t) n + 1); + if (buf == NULL) + /* `relloc' failed but we still have the original string. */ + buf = path; + } + return buf; } else no_new_dcache = 1; diff --git a/sysdeps/unix/sysv/linux/i386/chown.c b/sysdeps/unix/sysv/linux/i386/chown.c index e985ce0dae..7536b26923 100644 --- a/sysdeps/unix/sysv/linux/i386/chown.c +++ b/sysdeps/unix/sysv/linux/i386/chown.c @@ -59,9 +59,15 @@ __real_chown (const char *file, uid_t owner, gid_t group) #endif -#if !defined __NR_lchown || \ - (defined HAVE_ELF && defined PIC && defined DO_VERSIONING) -/* compiling under older kernels or for compatibiity */ +#ifndef __NR_lchown +/* Compiling under older kernels. */ +int +__chown_is_lchown (const char *file, uid_t owner, gid_t group) +{ + return __syscall_chown (file, owner, group); +} +#elif defined HAVE_ELF && defined PIC && defined DO_VERSIONING +/* Compiling for compatibiity. */ int __chown_is_lchown (const char *file, uid_t owner, gid_t group) { diff --git a/sysdeps/unix/sysv/linux/i386/i686/sysdep.h b/sysdeps/unix/sysv/linux/i386/i686/sysdep.h new file mode 100644 index 0000000000..001f3fc4d7 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/i686/sysdep.h @@ -0,0 +1,71 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper, <drepper@cygnus.com>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _LINUX_I386_I686_SYSDEP_H +#define _LINUX_I386_I686_SYSDEP_H 1 + +/* There is some commonality. */ +#include <sysdeps/unix/sysv/linux/i386/sysdep.h> + +/* We define special versions of the error handler code to match the i686's + deep branch prediction mechanism. */ +#ifdef PIC +# undef SYSCALL_ERROR_HANDLER + +/* Store (- %eax) into errno through the GOT. */ +# ifdef _LIBC_REENTRANT +# define SYSCALL_ERROR_HANDLER \ + .type syscall_error,@function; \ +0:movl (%esp),%ebx; \ + ret; \ +syscall_error: \ + pushl %ebx; \ + call 0b; \ + addl $_GLOBAL_OFFSET_TABLE_, %ebx; \ + xorl %edx, %edx; \ + subl %eax, %edx; \ + pushl %edx; \ + call __errno_location@PLT; \ + popl %ecx; \ + popl %ebx; \ + movl %ecx, (%eax); \ + movl $-1, %eax; \ + jmp L(pseudo_end); \ + .size syscall_error,.-syscall_error; +/* A quick note: it is assumed that the call to `__errno_location' does + not modify the stack! */ +# else +# define SYSCALL_ERROR_HANDLER \ + .type syscall_error,@function; \ +0:movl (%esp),%ecx; \ + ret; \ +syscall_error: \ + call 0b; \ + addl $_GLOBAL_OFFSET_TABLE_, %ecx; \ + xorl %edx, %edx; \ + subl %eax, %edx; \ + movl errno@GOT(%ecx), %ecx; \ + movl %edx, (%ecx); \ + movl $-1, %eax; \ + jmp L(pseudo_end); \ + .size syscall_error,.-syscall_error; +# endif /* _LIBC_REENTRANT */ +#endif /* PIC */ + +#endif /* linux/i386/i686/sysdep.h */ diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h index 713bd44524..2bb82a2009 100644 --- a/sysdeps/unix/sysv/linux/i386/sysdep.h +++ b/sysdeps/unix/sysv/linux/i386/sysdep.h @@ -140,10 +140,10 @@ syscall_error: \ %ecx and %edx when we have more than 1 and 2 registers resp. The code below might look a bit long but we have to take care for - the pipelined processors (i586 and up). Here the `pushl' and `popl' + the pipelined processors (i586). Here the `pushl' and `popl' instructions are marked as NP (not pairable) but the exception is two consecutive of these instruction. This gives no penalty on - i386 and i486 processors though. */ + other processors though. */ #undef DO_CALL #define DO_CALL(args, syscall_name) \ |