diff options
Diffstat (limited to 'erts/emulator/drivers/ose/ose_efile.c')
| -rw-r--r-- | erts/emulator/drivers/ose/ose_efile.c | 1125 |
1 files changed, 0 insertions, 1125 deletions
diff --git a/erts/emulator/drivers/ose/ose_efile.c b/erts/emulator/drivers/ose/ose_efile.c deleted file mode 100644 index c8337a95d5..0000000000 --- a/erts/emulator/drivers/ose/ose_efile.c +++ /dev/null @@ -1,1125 +0,0 @@ -/* - * %CopyrightBegin% - * - * Copyright Ericsson AB 1997-2012. All Rights Reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - * - * %CopyrightEnd% - */ -/* - * Purpose: Provides file and directory operations for OSE. - */ -#ifdef HAVE_CONFIG_H -# include "config.h" -#endif -#if defined(HAVE_POSIX_FALLOCATE) && !defined(__sun) && !defined(__sun__) -#define _XOPEN_SOURCE 600 -#endif -#if !defined(_GNU_SOURCE) && defined(HAVE_LINUX_FALLOC_H) -#define _GNU_SOURCE -#endif -#include "sys.h" -#include "erl_driver.h" -#include "erl_efile.h" -#if defined(DARWIN) || defined(HAVE_LINUX_FALLOC_H) || defined(HAVE_POSIX_FALLOCATE) -#include "fcntl.h" -#endif -#include "ose.h" -#include "unistd.h" -#include "sys/stat.h" -#include "dirent.h" -#include "sys/time.h" -#include "time.h" -#include "assert.h" - -/* Find a definition of MAXIOV, that is used in the code later. */ -#if defined IOV_MAX -#define MAXIOV IOV_MAX -#elif defined UIO_MAXIOV -#define MAXIOV UIO_MAXIOV -#else -#define MAXIOV 16 -#endif - -/* - * Macros for testing file types. - */ - -#define ISDIR(st) (((st).st_mode & S_IFMT) == S_IFDIR) -#define ISREG(st) (((st).st_mode & S_IFMT) == S_IFREG) -#define ISDEV(st) \ - (((st).st_mode&S_IFMT) == S_IFCHR || ((st).st_mode&S_IFMT) == S_IFBLK) -#define ISLNK(st) (((st).st_mode & S_IFLNK) == S_IFLNK) -#ifdef NO_UMASK -#define FILE_MODE 0644 -#define DIR_MODE 0755 -#else -#define FILE_MODE 0666 -#define DIR_MODE 0777 -#endif - -#define IS_DOT_OR_DOTDOT(s) \ - (s[0] == '.' && (s[1] == '\0' || (s[1] == '.' && s[2] == '\0'))) - -/* - * Macros for handling local file descriptors - * and mutexes. - * - * Handling of files like this is necessary because OSE - * does not allow seeking after the end of a file. So - * what we do it emulate this by keeping track of the size - * of the file and where the file's positions is. If a - * write happens after eof then we pad it. - * - * Given time this should be rewritten to get rid of the - * mutex and use the port lock to protect the data. This - * could be done be done by adapting the efile api for some - * calls to allow some meta-data to be associated with the - * open file. - */ - -#define L_FD_IS_VALID(fd_data) ((fd_data)->beyond_eof > 0) -#define L_FD_INVALIDATE(fd_data) (fd_data)->beyond_eof = 0 -#define L_FD_CUR(fd_data) (fd_data)->pos -#define L_FD_OFFS_BEYOND_EOF(fd_data, offs) \ - (((fd_data)->size > offs) ? 0 : 1) - -#define L_FD_FAIL -1 -#define L_FD_SUCCESS 1 -#define L_FD_PAD_SIZE 255 - -struct fd_meta { - ErlDrvMutex *meta_mtx; - struct fd_data *fd_data_list; -}; - -struct fd_data { - int fd; - struct fd_data *next; - struct fd_data *prev; - int pos; - int beyond_eof; - size_t size; -#ifdef DEBUG - PROCESS owner; -#endif -}; - -static int l_invalidate_local_fd(int fd); -static int l_pad_file(struct fd_data *fd_data, off_t offset); -static int check_error(int result, Efile_error* errInfo); -static struct fd_data* l_new_fd(void); -static int l_remove_local_fd(int fd); -static struct fd_data* l_find_local_fd(int fd); -static int l_update_local_fd(int fd, int pos, int size); - -static struct fd_meta* fdm = NULL; - - -/***************************************************************************/ - -static int -l_remove_local_fd(int fd) -{ - struct fd_data *fd_data; - fd_data = l_find_local_fd(fd); - - if (fd_data == NULL) { - return L_FD_FAIL; - } -#ifdef DEBUG - assert(fd_data->owner == current_process()); -#endif - erl_drv_mutex_lock(fdm->meta_mtx); - /* head ? */ - if (fd_data == fdm->fd_data_list) { - if (fd_data->next != NULL) { - /* remove link to head */ - fd_data->next->prev = NULL; - /* set new head */ - fdm->fd_data_list = fd_data->next; - } - else { - /* head is lonely */ - fdm->fd_data_list = NULL; - } - } - else { /* not head */ - if (fd_data->prev == NULL) { - erl_drv_mutex_unlock(fdm->meta_mtx); - return L_FD_FAIL; - } - else { - if (fd_data->next != NULL) { - fd_data->next->prev = fd_data->prev; - fd_data->prev->next = fd_data->next; - } - else { - fd_data->prev->next = NULL; - } - } - } - - /* scramble values */ - fd_data->beyond_eof = -1; - fd_data->next = NULL; - fd_data->prev = NULL; - fd_data->fd = -1; - - /* unlock and clean */ - driver_free(fd_data); - erl_drv_mutex_unlock(fdm->meta_mtx); - - return L_FD_SUCCESS; -} - -/***************************************************************************/ - -static int -l_invalidate_local_fd(int fd) { - struct fd_data *fd_data; - - if ((fd_data = l_find_local_fd(fd)) == NULL) { - return L_FD_FAIL; - } - - fd_data->beyond_eof = 0; - return L_FD_SUCCESS; -} - -/****************************************************************************/ - -static struct fd_data* -l_find_local_fd(int fd) { - struct fd_data *fd_data; - - fd_data = NULL; - erl_drv_mutex_lock(fdm->meta_mtx); - for (fd_data = fdm->fd_data_list; fd_data != NULL; ) { - if (fd_data->fd == fd) { -#ifdef DEBUG - assert(fd_data->owner == current_process()); -#endif - break; - } - fd_data = fd_data->next; - } - erl_drv_mutex_unlock(fdm->meta_mtx); - return fd_data; -} - -/***************************************************************************/ - -static struct fd_data* -l_new_fd(void) { - struct fd_data *fd_data; - - fd_data = driver_alloc(sizeof(struct fd_data)); - if (fd_data == NULL) { - return NULL; - } - erl_drv_mutex_lock(fdm->meta_mtx); - if (fdm->fd_data_list == NULL) { - fdm->fd_data_list = fd_data; - fdm->fd_data_list->prev = NULL; - fdm->fd_data_list->next = NULL; - } - else { - fd_data->next = fdm->fd_data_list; - fdm->fd_data_list = fd_data; - fdm->fd_data_list->prev = NULL; - } -#ifdef DEBUG - fd_data->owner = current_process(); -#endif - erl_drv_mutex_unlock(fdm->meta_mtx); - return fd_data; -} - -/***************************************************************************/ - -static int -l_update_local_fd(int fd, int pos, int size) { - struct fd_data *fd_data = NULL; - - fd_data = l_find_local_fd(fd); - /* new fd to handle? */ - if (fd_data == NULL) { - fd_data = l_new_fd(); - if (fd_data == NULL) { - /* out of memory */ - return L_FD_FAIL; - } - } - fd_data->size = size; - fd_data->pos = pos; - fd_data->fd = fd; - fd_data->beyond_eof = 1; - - return L_FD_SUCCESS; -} - -/***************************************************************************/ - -static int -l_pad_file(struct fd_data *fd_data, off_t offset) { - int size_dif; - int written = 0; - int ret_val = L_FD_SUCCESS; - char padding[L_FD_PAD_SIZE]; - - size_dif = (offset - fd_data->size); - memset(&padding, '\0', L_FD_PAD_SIZE); - - while (size_dif > 0) { - written = write(fd_data->fd, padding, - (size_dif < L_FD_PAD_SIZE) ? - size_dif : L_FD_PAD_SIZE); - if (written < 0 && errno != EINTR && errno != EAGAIN) { - ret_val = -1; - break; - } - size_dif -= written; - } - L_FD_INVALIDATE(fd_data); - return ret_val; -} - -/***************************************************************************/ - -static int -check_error(int result, Efile_error *errInfo) { - if (result < 0) { - errInfo->posix_errno = errInfo->os_errno = errno; - return 0; - } - return 1; -} - -/***************************************************************************/ - -int -efile_init() { - fdm = driver_alloc(sizeof(struct fd_meta)); - if (fdm == NULL) { - return L_FD_FAIL; - } - fdm->meta_mtx = erl_drv_mutex_create("ose_efile local fd mutex\n"); - erl_drv_mutex_lock(fdm->meta_mtx); - fdm->fd_data_list = NULL; - erl_drv_mutex_unlock(fdm->meta_mtx); - return L_FD_SUCCESS; -} - -/***************************************************************************/ - -int -efile_mkdir(Efile_error* errInfo, /* Where to return error codes. */ - char* name) /* Name of directory to create. */ -{ -#ifdef NO_MKDIR_MODE - return check_error(mkdir(name), errInfo); -#else - int res = mkdir(name, DIR_MODE); - if (res < 0 && errno == EINVAL) { - errno = ENOENT; - } - return check_error(res, errInfo); -#endif -} - -/***************************************************************************/ - -int -efile_rmdir(Efile_error* errInfo, /* Where to return error codes. */ - char* name) /* Name of directory to delete. */ -{ - if (rmdir(name) == 0) { - return 1; - } - if (errno == ENOTEMPTY) { - errno = EEXIST; - } - if (errno == EEXIST || errno == EINVAL) { - int saved_errno = errno; - struct stat file_stat; - struct stat cwd_stat; - - if(stat(name, &file_stat) != 0) { - errno = ENOENT; - return check_error(-1, errInfo); - } - /* - * The error code might be wrong if this is the current directory. - */ - if (stat(name, &file_stat) == 0 && stat(".", &cwd_stat) == 0 && - file_stat.st_ino == cwd_stat.st_ino && - file_stat.st_dev == cwd_stat.st_dev) { - saved_errno = EACCES; - } - errno = saved_errno; - } - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_delete_file(Efile_error* errInfo, /* Where to return error codes. */ - char* name) /* Name of file to delete. */ -{ - struct stat statbuf; - - if (stat(name, &statbuf) >= 0) { - /* Do not let unlink() remove directories */ - if (ISDIR(statbuf)) { - errno = EPERM; - return check_error(-1, errInfo); - } - - if (unlink(name) == 0) { - return 1; - } - - if (errno == EISDIR) { - errno = EPERM; - return check_error(-1, errInfo); - } - } - else { - if (errno == EINVAL) { - errno = ENOENT; - return check_error(-1, errInfo); - } - } - return check_error(-1, errInfo); -} - -/* - *--------------------------------------------------------------------------- - * - * Changes the name of an existing file or directory, from src to dst. - * If src and dst refer to the same file or directory, does nothing - * and returns success. Otherwise if dst already exists, it will be - * deleted and replaced by src subject to the following conditions: - * If src is a directory, dst may be an empty directory. - * If src is a file, dst may be a file. - * In any other situation where dst already exists, the rename will - * fail. - * - * Results: - * If the directory was successfully created, returns 1. - * Otherwise the return value is 0 and errno is set to - * indicate the error. Some possible values for errno are: - * - * EACCES: src or dst parent directory can't be read and/or written. - * EEXIST: dst is a non-empty directory. - * EINVAL: src is a root directory or dst is a subdirectory of src. - * EISDIR: dst is a directory, but src is not. - * ENOENT: src doesn't exist, or src or dst is "". - * ENOTDIR: src is a directory, but dst is not. - * EXDEV: src and dst are on different filesystems. - * - * Side effects: - * The implementation of rename may allow cross-filesystem renames, - * but the caller should be prepared to emulate it with copy and - * delete if errno is EXDEV. - * - *--------------------------------------------------------------------------- - */ - -int -efile_rename(Efile_error* errInfo, /* Where to return error codes. */ - char* src, /* Original name. */ - char* dst) /* New name. */ -{ - - /* temporary fix AFM does not recognize ./<file name> - * in destination remove pending on adaption of AFM fix - */ - - char *dot_str; - if (dst != NULL) { - dot_str = strchr(dst, '.'); - if (dot_str && dot_str == dst && dot_str[1] == '/') { - dst = dst+2; - } - } - - if (rename(src, dst) == 0) { - return 1; - } - if (errno == ENOTEMPTY) { - errno = EEXIST; - } - if (errno == EINVAL) { - struct stat file_stat; - - if (stat(dst, &file_stat)== 0) { - if (ISDIR(file_stat)) { - errno = EISDIR; - } - else if (ISREG(file_stat)) { - errno = ENOTDIR; - } - else { - errno = EINVAL; - } - } - else { - errno = EINVAL; - } - } - - if (strcmp(src, "/") == 0) { - errno = EINVAL; - } - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_chdir(Efile_error* errInfo, /* Where to return error codes. */ - char* name) /* Name of directory to make current. */ -{ - return check_error(chdir(name), errInfo); -} - -/***************************************************************************/ - -int -efile_getdcwd(Efile_error* errInfo, /* Where to return error codes. */ - int drive, /* 0 - current, 1 - A, 2 - B etc. */ - char* buffer, /* Where to return the current - directory. */ - size_t size) /* Size of buffer. */ -{ - if (drive == 0) { - if (getcwd(buffer, size) == NULL) - return check_error(-1, errInfo); - - return 1; - } - - /* - * Drives other than 0 is not supported on Unix. - */ - - errno = ENOTSUP; - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_readdir(Efile_error* errInfo, /* Where to return error codes. */ - char* name, /* Name of directory to open. */ - EFILE_DIR_HANDLE* p_dir_handle, /* Pointer to directory - handle of - open directory.*/ - char* buffer, /* Pointer to buffer for - one filename. */ - size_t *size) /* in-out Size of buffer, length - of name. */ -{ - DIR *dp; /* Pointer to directory structure. */ - struct dirent* dirp; /* Pointer to directory entry. */ - - /* - * If this is the first call, we must open the directory. - */ - - if (*p_dir_handle == NULL) { - dp = opendir(name); - if (dp == NULL) - return check_error(-1, errInfo); - *p_dir_handle = (EFILE_DIR_HANDLE) dp; - } - - /* - * Retrieve the name of the next file using the directory handle. - */ - - dp = *((DIR **)((void *)p_dir_handle)); - for (;;) { - dirp = readdir(dp); - if (dirp == NULL) { - closedir(dp); - return 0; - } - if (IS_DOT_OR_DOTDOT(dirp->d_name)) - continue; - buffer[0] = '\0'; - strncat(buffer, dirp->d_name, (*size)-1); - *size = strlen(dirp->d_name); - return 1; - } -} - -/***************************************************************************/ - -int -efile_openfile(Efile_error* errInfo, /* Where to return error codes. */ - char* name, /* Name of directory to open. */ - int flags, /* Flags to user for opening. */ - int* pfd, /* Where to store the file - descriptor. */ - Sint64 *pSize) /* Where to store the size of the - file. */ -{ - struct stat statbuf; - int fd; - int mode; /* Open mode. */ - - if (stat(name, &statbuf) >= 0 && !ISREG(statbuf)) { - errno = EISDIR; - return check_error(-1, errInfo); - } - - switch (flags & (EFILE_MODE_READ|EFILE_MODE_WRITE)) { - case EFILE_MODE_READ: - mode = O_RDONLY; - break; - case EFILE_MODE_WRITE: - if (flags & EFILE_NO_TRUNCATE) - mode = O_WRONLY | O_CREAT; - else - mode = O_WRONLY | O_CREAT | O_TRUNC; - break; - case EFILE_MODE_READ_WRITE: - mode = O_RDWR | O_CREAT; - break; - default: - errno = EINVAL; - return check_error(-1, errInfo); - } - - - if (flags & EFILE_MODE_APPEND) { - mode &= ~O_TRUNC; - mode |= O_APPEND; - } - - if (flags & EFILE_MODE_EXCL) { - mode |= O_EXCL; - } - - fd = open(name, mode, FILE_MODE); - - if (!check_error(fd, errInfo)) - return 0; - - *pfd = fd; - if (pSize) { - *pSize = statbuf.st_size; - } - return 1; -} - -/***************************************************************************/ - -int -efile_may_openfile(Efile_error* errInfo, char *name) { - struct stat statbuf; /* Information about the file */ - int result; - - result = stat(name, &statbuf); - if (!check_error(result, errInfo)) - return 0; - if (!ISREG(statbuf)) { - errno = EISDIR; - return check_error(-1, errInfo); - } - return 1; -} - -/***************************************************************************/ - -void -efile_closefile(int fd) -{ - if (l_find_local_fd(fd) != NULL) { - l_remove_local_fd(fd); - } - close(fd); -} - -/***************************************************************************/ - -int -efile_fdatasync(Efile_error *errInfo, /* Where to return error codes. */ - int fd) /* File descriptor for file to sync data. */ -{ - return efile_fsync(errInfo, fd); -} - -/***************************************************************************/ - -int -efile_fsync(Efile_error *errInfo, /* Where to return error codes. */ - int fd) /* File descriptor for file to sync. */ -{ - return check_error(fsync(fd), errInfo); -} - -/***************************************************************************/ - -int -efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo, - char* name, int info_for_link) -{ - struct stat statbuf; /* Information about the file */ - int result; - - result = stat(name, &statbuf); - if (!check_error(result, errInfo)) { - return 0; - } - -#if SIZEOF_OFF_T == 4 - pInfo->size_high = 0; -#else - pInfo->size_high = (Uint32)(statbuf.st_size >> 32); -#endif - pInfo->size_low = (Uint32)statbuf.st_size; - -#ifdef NO_ACCESS - /* Just look at read/write access for owner. */ - - pInfo->access = ((statbuf.st_mode >> 6) & 07) >> 1; - -#else - pInfo->access = FA_NONE; - if (access(name, R_OK) == 0) - pInfo->access |= FA_READ; - if (access(name, W_OK) == 0) - pInfo->access |= FA_WRITE; - -#endif - - if (ISDEV(statbuf)) - pInfo->type = FT_DEVICE; - else if (ISDIR(statbuf)) - pInfo->type = FT_DIRECTORY; - else if (ISREG(statbuf)) - pInfo->type = FT_REGULAR; - else if (ISLNK(statbuf)) - pInfo->type = FT_SYMLINK; - else - pInfo->type = FT_OTHER; - - pInfo->accessTime = statbuf.st_atime; - pInfo->modifyTime = statbuf.st_mtime; - pInfo->cTime = statbuf.st_ctime; - - pInfo->mode = statbuf.st_mode; - pInfo->links = statbuf.st_nlink; - pInfo->major_device = statbuf.st_dev; - pInfo->inode = statbuf.st_ino; - pInfo->uid = statbuf.st_uid; - pInfo->gid = statbuf.st_gid; - - return 1; -} - -/***************************************************************************/ - -int -efile_write_info(Efile_error *errInfo, Efile_info *pInfo, char *name) -{ - /* - * On some systems chown will always fail for a non-root user unless - * POSIX_CHOWN_RESTRICTED is not set. Others will succeed as long as - * you don't try to chown a file to someone besides youself. - */ - if (pInfo->mode != -1) { - mode_t newMode = pInfo->mode & (S_ISUID | S_ISGID | - S_IRWXU | S_IRWXG | S_IRWXO); - if (chmod(name, newMode)) { - newMode &= ~(S_ISUID | S_ISGID); - if (chmod(name, newMode)) { - return check_error(-1, errInfo); - } - } - } - - return 1; -} - -/***************************************************************************/ - -int -efile_write(Efile_error* errInfo, /* Where to return error codes. */ - int flags, /* Flags given when file was - opened. */ - int fd, /* File descriptor to write to. */ - char* buf, /* Buffer to write. */ - size_t count) /* Number of bytes to write. */ -{ - ssize_t written; /* Bytes written in last operation. */ - struct fd_data *fd_data; - - if ((fd_data = l_find_local_fd(fd)) != NULL) { - if (L_FD_IS_VALID(fd_data)) { - /* we are beyond eof and need to pad*/ - if (l_pad_file(fd_data, L_FD_CUR(fd_data)) < 0) { - return check_error(-1, errInfo); - } - } - } - - while (count > 0) { - if ((written = write(fd, buf, count)) < 0) { - if (errno != EINTR) { - return check_error(-1, errInfo); - } - else { - written = 0; - } - } - ASSERT(written <= count); - buf += written; - count -= written; - } - return 1; -} - -/***************************************************************************/ - -int -efile_writev(Efile_error* errInfo, /* Where to return error codes */ - int flags, /* Flags given when file was - * opened */ - int fd, /* File descriptor to write to */ - SysIOVec* iov, /* Vector of buffer structs. - * The structs may be changed i.e. - * due to incomplete writes */ - int iovcnt) /* Number of structs in vector */ -{ - struct fd_data *fd_data; - int cnt = 0; /* Buffers so far written */ - - ASSERT(iovcnt >= 0); - if ((fd_data = l_find_local_fd(fd)) != NULL) { - if (L_FD_IS_VALID(fd_data)) { - /* we are beyond eof and need to pad*/ - if (l_pad_file(fd_data, L_FD_CUR(fd_data)) < 0) { - return check_error(-1, errInfo); - } - } - } - while (cnt < iovcnt) { - if ((! iov[cnt].iov_base) || (iov[cnt].iov_len <= 0)) { - /* Empty buffer - skip */ - cnt++; - } - else { /* Non-empty buffer */ - ssize_t w; /* Bytes written in this call */ - do { - w = write(fd, iov[cnt].iov_base, iov[cnt].iov_len); - } while (w < 0 && errno == EINTR); - - ASSERT(w <= iov[cnt].iov_len || w == -1); - - if (w < 0) { - return check_error(-1, errInfo); - } - /* Move forward to next buffer to write */ - for (; cnt < iovcnt && w > 0; cnt++) { - if (iov[cnt].iov_base && iov[cnt].iov_len > 0) { - if (w < iov[cnt].iov_len) { - /* Adjust the buffer for next write */ - iov[cnt].iov_len -= w; - iov[cnt].iov_base += w; - w = 0; - break; - } - else { - w -= iov[cnt].iov_len; - } - } - } - ASSERT(w == 0); - } /* else Non-empty buffer */ - } /* while (cnt< iovcnt) */ - return 1; -} - -/***************************************************************************/ - -int -efile_read(Efile_error* errInfo, /* Where to return error codes. */ - int flags, /* Flags given when file was opened. */ - int fd, /* File descriptor to read from. */ - char* buf, /* Buffer to read into. */ - size_t count, /* Number of bytes to read. */ - size_t *pBytesRead) /* Where to return number of - bytes read. */ -{ - ssize_t n; - struct fd_data *fd_data; - - if ((fd_data = l_find_local_fd(fd)) != NULL) { - if (L_FD_IS_VALID(fd_data)) { - *pBytesRead = 0; - return 1; - } - } - for (;;) { - if ((n = read(fd, buf, count)) >= 0) { - break; - } - else if (errno != EINTR) { - return check_error(-1, errInfo); - } - } - if (fd_data != NULL && L_FD_IS_VALID(fd_data)) { - L_FD_INVALIDATE(fd_data); - } - *pBytesRead = (size_t) n; - return 1; -} - -/* pread() and pwrite() */ -/* Some unix systems, notably Solaris has these syscalls */ -/* It is especially nice for i.e. the dets module to have support */ -/* for this, even if the underlying OS dosn't support it, it is */ -/* reasonably easy to work around by first calling seek, and then */ -/* calling read(). */ -/* This later strategy however changes the file pointer, which pread() */ -/* does not do. We choose to ignore this and say that the location */ -/* of the file pointer is undefined after a call to any of the p functions*/ - - -int -efile_pread(Efile_error* errInfo, /* Where to return error codes. */ - int fd, /* File descriptor to read from. */ - Sint64 offset, /* Offset in bytes from BOF. */ - char* buf, /* Buffer to read into. */ - size_t count, /* Number of bytes to read. */ - size_t *pBytesRead) /* Where to return - number of bytes read. */ -{ - int res = efile_seek(errInfo, fd, offset, EFILE_SEEK_SET, NULL); - if (res) { - return efile_read(errInfo, 0, fd, buf, count, pBytesRead); - } else { - return res; - } -} - - -/***************************************************************************/ - -int -efile_pwrite(Efile_error* errInfo, /* Where to return error codes. */ - int fd, /* File descriptor to write to. */ - char* buf, /* Buffer to write. */ - size_t count, /* Number of bytes to write. */ - Sint64 offset) /* where to write it */ -{ - int res = efile_seek(errInfo, fd, offset, EFILE_SEEK_SET, NULL); - - if (res) { - return efile_write(errInfo, 0, fd, buf, count); - } else { - return res; - } -} - -/***************************************************************************/ - -int -efile_seek(Efile_error* errInfo, /* Where to return error codes. */ - int fd, /* File descriptor to do the seek on. */ - Sint64 offset, /* Offset in bytes from the given - origin. */ - int origin, /* Origin of seek (SEEK_SET, SEEK_CUR, - SEEK_END). */ - Sint64 *new_location) /* Resulting new location in file. */ -{ - off_t off, result; - off = (off_t) offset; - - switch (origin) { - case EFILE_SEEK_SET: - origin = SEEK_SET; - break; - case EFILE_SEEK_CUR: - origin = SEEK_CUR; - break; - case EFILE_SEEK_END: - origin = SEEK_END; - break; - default: - errno = EINVAL; - return check_error(-1, errInfo); - } - - if (off != offset) { - errno = EINVAL; - return check_error(-1, errInfo); - } - - errno = 0; - result = lseek(fd, off, origin); - - if (result >= 0) { - l_invalidate_local_fd(fd); - } - - if (result < 0) - { - if (errno == ENOSYS) { - int size, cur_pos; - - if (off < 0) { - errno = EINVAL; - return check_error(-1, errInfo); - } - - cur_pos = lseek(fd, 0, SEEK_CUR); - size = lseek(fd, 0, SEEK_END); - - if (origin == SEEK_SET) { - result = offset; - } - else if (origin == SEEK_CUR) { - result = offset + cur_pos; - } - else if (origin == SEEK_END) { - result = size + offset; - } - - /* sanity check our result */ - if (size > result) { - return check_error(-1, errInfo); - } - - /* store the data localy */ - l_update_local_fd(fd, result, size); - - /* reset the original file position */ - if (origin != SEEK_END) { - lseek(fd, cur_pos, SEEK_SET); - } - } - else if (errno == 0) { - errno = EINVAL; - } - } - - if (new_location) { - *new_location = result; - } - - return 1; -} - -/***************************************************************************/ - -int -efile_truncate_file(Efile_error* errInfo, int *fd, int flags) -{ - off_t offset; - struct fd_data *fd_data; - - if ((fd_data = l_find_local_fd(*fd)) != NULL && L_FD_IS_VALID(fd_data)) { - offset = L_FD_CUR(fd_data); - } - else { - offset = lseek(*fd, 0, SEEK_CUR); - } - - return check_error(((offset >= 0) && - (ftruncate(*fd, offset) == 0)) ? 1 : -1, errInfo); -} - -/***************************************************************************/ - -int -efile_readlink(Efile_error* errInfo, char* name, char* buffer, size_t size) -{ - errno = ENOTSUP; - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_altname(Efile_error* errInfo, char* name, char* buffer, size_t size) -{ - errno = ENOTSUP; - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_link(Efile_error* errInfo, char* old, char* new) -{ - errno = ENOTSUP; - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_symlink(Efile_error* errInfo, char* old, char* new) -{ - errno = ENOTSUP; - return check_error(-1, errInfo); -} - -/***************************************************************************/ - -int -efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset, - Sint64 length, int advise) -{ - return check_error(posix_fadvise(fd, offset, length, advise), errInfo); -} - -/***************************************************************************/ - -static int -call_posix_fallocate(int fd, Sint64 offset, Sint64 length) -{ - int ret; - - /* - * On Linux and Solaris for example, posix_fallocate() returns - * a positive error number on error and it does not set errno. - * On FreeBSD however (9.0 at least), it returns -1 on error - * and it sets errno. - */ - do { - ret = posix_fallocate(fd, (off_t) offset, (off_t) length); - if (ret > 0) { - errno = ret; - ret = -1; - } - } while (ret != 0 && errno == EINTR); - - return ret; -} - -/***************************************************************************/ - -int -efile_fallocate(Efile_error* errInfo, int fd, Sint64 offset, Sint64 length) -{ - return check_error(call_posix_fallocate(fd, offset, length), errInfo); -} |