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syscall.c

Go to the documentation of this file.

/* 
   Copyright (C) Andrew Tridgell 1998
   Copyright (C) 2002 by Martin Pool
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/**
 * @file syscall.c
 *
 * Syscall wrappers to ensure that nothing gets done in dry_run mode
 * and to handle system peculiarities.
 **/

#include "rsync.h"

extern int dry_run;
extern int read_only;
extern int list_only;

#define CHECK_RO if (read_only || list_only) {errno = EROFS; return -1;}

int do_unlink(char *fname)
{
        if (dry_run) return 0;
        CHECK_RO
        return unlink(fname);
}

int do_symlink(char *fname1, char *fname2)
{
        if (dry_run) return 0;
        CHECK_RO
        return symlink(fname1, fname2);
}

#if HAVE_LINK
int do_link(char *fname1, char *fname2)
{
        if (dry_run) return 0;
        CHECK_RO
        return link(fname1, fname2);
}
#endif

int do_lchown(const char *path, uid_t owner, gid_t group)
{
        if (dry_run) return 0;
        CHECK_RO
        return lchown(path, owner, group);
}

#if HAVE_MKNOD
int do_mknod(char *pathname, mode_t mode, dev_t dev)
{
        if (dry_run) return 0;
        CHECK_RO
        return mknod(pathname, mode, dev);
}
#endif

int do_rmdir(char *pathname)
{
        if (dry_run) return 0;
        CHECK_RO
        return rmdir(pathname);
}

int do_open(char *pathname, int flags, mode_t mode)
{
        if (flags != O_RDONLY) {
            if (dry_run) return -1;
            CHECK_RO
        }
#ifdef O_BINARY
        /* for Windows */
        flags |= O_BINARY;
#endif
        /* some systems can't handle a double / */
        if (pathname[0] == '/' && pathname[1] == '/') pathname++;

        return open(pathname, flags, mode);
}

#if HAVE_CHMOD
int do_chmod(const char *path, mode_t mode)
{
        if (dry_run) return 0;
        CHECK_RO
        return chmod(path, mode);
}
#endif

int do_rename(char *fname1, char *fname2)
{
        if (dry_run) return 0;
        CHECK_RO
        return rename(fname1, fname2);
}


void trim_trailing_slashes(char *name)
{
        int l;
        /* Some BSD systems cannot make a directory if the name
         * contains a trailing slash.
         * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
        
        /* Don't change empty string; and also we can't improve on
         * "/" */
        
        l = strlen(name);
        while (l > 1) {
                if (name[--l] != '/')
                        break;
                name[l] = '\0';
        }
}


int do_mkdir(char *fname, mode_t mode)
{
        if (dry_run)
                return 0;
        CHECK_RO;
        trim_trailing_slashes(fname);   
        return mkdir(fname, mode);
}


/* like mkstemp but forces permissions */
int do_mkstemp(char *template, mode_t perms)
{
        if (dry_run) return -1;
        if (read_only) {errno = EROFS; return -1;}

#if defined(HAVE_SECURE_MKSTEMP) && defined(HAVE_FCHMOD)
        {
                int fd = mkstemp(template);
                if (fd == -1) return -1;
                if (fchmod(fd, perms) != 0) {
                        close(fd);
                        unlink(template);
                        return -1;
                }
                return fd;
        }
#else
        if (!mktemp(template)) return -1;
        return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
#endif
}

int do_stat(const char *fname, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
        return stat64(fname, st);
#else
        return stat(fname, st);
#endif
}

#if SUPPORT_LINKS
int do_lstat(const char *fname, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
        return lstat64(fname, st);
#else
        return lstat(fname, st);
#endif
}
#endif

int do_fstat(int fd, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
        return fstat64(fd, st);
#else
        return fstat(fd, st);
#endif
}

OFF_T do_lseek(int fd, OFF_T offset, int whence)
{
#if HAVE_OFF64_T
        off64_t lseek64();
        return lseek64(fd, offset, whence);
#else
        return lseek(fd, offset, whence);
#endif
}

#ifdef USE_MMAP
void *do_mmap(void *start, int len, int prot, int flags, int fd, OFF_T offset)
{
#if HAVE_OFF64_T
        return mmap64(start, len, prot, flags, fd, offset);
#else
        return mmap(start, len, prot, flags, fd, offset);
#endif
}
#endif

char *d_name(struct dirent *di)
{
#if HAVE_BROKEN_READDIR
        return (di->d_name - 2);
#else
        return di->d_name;
#endif
}

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