/*
- * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2013 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
-/** \file fd.c helper functions for file descriptor handling */
+/** \file fd.c Helper functions for file descriptor handling. */
+#include <regex.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/mman.h>
#include <fcntl.h>
-#include <sys/select.h>
+#include <sys/uio.h>
#include "para.h"
#include "error.h"
+#include "string.h"
+#include "fd.h"
+
+/**
+ * Write an array of buffers to a file descriptor.
+ *
+ * \param fd The file descriptor.
+ * \param iov Pointer to one or more buffers.
+ * \param iovcnt The number of buffers.
+ *
+ * EAGAIN/EWOULDBLOCK is not considered a fatal error condition. For example
+ * DCCP CCID3 has a sending wait queue which fills up and is emptied
+ * asynchronously. The EAGAIN case means that there is currently no space in
+ * the wait queue, but this can change at any moment.
+ *
+ * \return Negative on fatal errors, number of bytes written else.
+ *
+ * For blocking file descriptors, this function returns either the sum of all
+ * buffer sizes, or the error code of the fatal error that caused the last
+ * write call to fail.
+ *
+ * For nonblocking file descriptors there is a third possibility: Any positive
+ * return value less than the sum of the buffer sizes indicates that some bytes
+ * have been written but the next write would block.
+ *
+ * \sa writev(2), \ref xwrite().
+ */
+int xwritev(int fd, struct iovec *iov, int iovcnt)
+{
+ size_t written = 0;
+ int i;
+ struct iovec saved_iov, *curiov;
+
+ i = 0;
+ curiov = iov;
+ saved_iov = *curiov;
+ while (i < iovcnt && curiov->iov_len > 0) {
+ ssize_t ret = writev(fd, curiov, iovcnt - i);
+ if (ret >= 0) {
+ written += ret;
+ while (ret > 0) {
+ if (ret < curiov->iov_len) {
+ curiov->iov_base += ret;
+ curiov->iov_len -= ret;
+ break;
+ }
+ ret -= curiov->iov_len;
+ *curiov = saved_iov;
+ i++;
+ if (i >= iovcnt)
+ return written;
+ curiov++;
+ saved_iov = *curiov;
+ }
+ continue;
+ }
+ if (errno == EINTR)
+ /*
+ * The write() call was interrupted by a signal before
+ * any data was written. Try again.
+ */
+ continue;
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ /*
+ * We don't consider this an error. Note that POSIX
+ * allows either error to be returned, and does not
+ * require these constants to have the same value.
+ */
+ return written;
+ /* fatal error */
+ return -ERRNO_TO_PARA_ERROR(errno);
+ }
+ return written;
+}
+
+/**
+ * Write a buffer to a file descriptor, re-writing on short writes.
+ *
+ * \param fd The file descriptor.
+ * \param buf The buffer to write.
+ * \param len The number of bytes to write.
+ *
+ * This is a simple wrapper for \ref xwritev().
+ *
+ * \return The return value of the underlying call to \ref xwritev().
+ */
+int xwrite(int fd, const char *buf, size_t len)
+{
+ struct iovec iov = {.iov_base = (void *)buf, .iov_len = len};
+ return xwritev(fd, &iov, 1);
+}
+
/**
- * check whether a file exists
+ * Write all data to a file descriptor.
+ *
+ * \param fd The file descriptor.
+ * \param buf The buffer to be sent.
+ * \param len The length of \a buf.
+ *
+ * This is like \ref xwrite() but returns \p -E_SHORT_WRITE if not
+ * all data could be written.
+ *
+ * \return Number of bytes written on success, negative error code else.
+ */
+int write_all(int fd, const char *buf, size_t len)
+{
+ int ret = xwrite(fd, buf, len);
+
+ if (ret < 0)
+ return ret;
+ if (ret != len)
+ return -E_SHORT_WRITE;
+ return ret;
+}
+
+/**
+ * Write a buffer given by a format string.
+ *
+ * \param fd The file descriptor.
+ * \param fmt A format string.
+ *
+ * \return The return value of the underlying call to \ref write_all().
+ */
+__printf_2_3 int write_va_buffer(int fd, const char *fmt, ...)
+{
+ char *msg;
+ int ret;
+ va_list ap;
+
+ va_start(ap, fmt);
+ ret = xvasprintf(&msg, fmt, ap);
+ ret = write_all(fd, msg, ret);
+ free(msg);
+ return ret;
+}
+
+/**
+ * Read from a non-blocking file descriptor into multiple buffers.
+ *
+ * \param fd The file descriptor to read from.
+ * \param iov Scatter/gather array used in readv().
+ * \param iovcnt Number of elements in \a iov.
+ * \param rfds An optional fd set pointer.
+ * \param num_bytes Result pointer. Contains the number of bytes read from \a fd.
+ *
+ * If \a rfds is not \p NULL and the (non-blocking) file descriptor \a fd is
+ * not set in \a rfds, this function returns early without doing anything.
+ * Otherwise The function tries to read up to \a sz bytes from \a fd, where \a
+ * sz is the sum of the lengths of all vectors in \a iov. As for xwrite(),
+ * \p EAGAIN is not considered an error condition. However, \p EOF is.
*
- * \param fn the file name
+ * \return Zero or a negative error code. If the underlying call to readv(2)
+ * returned zero (indicating an end of file condition) or failed for some
+ * reason other than \p EAGAIN, a negative return value is returned.
+ *
+ * In any case, \a num_bytes contains the number of bytes that have been
+ * successfully read from \a fd (zero if the first readv() call failed with
+ * EAGAIN). Note that even if the function returns negative, some data might
+ * have been read before the error occurred. In this case \a num_bytes is
+ * positive.
+ *
+ * \sa \ref xwrite(), read(2), readv(2).
+ */
+int readv_nonblock(int fd, struct iovec *iov, int iovcnt, fd_set *rfds,
+ size_t *num_bytes)
+{
+ int ret, i, j;
+
+ *num_bytes = 0;
+ /*
+ * Avoid a shortcoming of select(): Reads from a non-blocking fd might
+ * return EAGAIN even if FD_ISSET() returns true. However, FD_ISSET()
+ * returning false definitely means that no data can currently be read.
+ * This is the common case, so it is worth to avoid the overhead of the
+ * read() system call in this case.
+ */
+ if (rfds && !FD_ISSET(fd, rfds))
+ return 0;
+
+ for (i = 0, j = 0; i < iovcnt;) {
+
+ /* fix up the first iov */
+ assert(j < iov[i].iov_len);
+ iov[i].iov_base += j;
+ iov[i].iov_len -= j;
+ ret = readv(fd, iov + i, iovcnt - i);
+ iov[i].iov_base -= j;
+ iov[i].iov_len += j;
+
+ if (ret == 0)
+ return -E_EOF;
+ if (ret < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -ERRNO_TO_PARA_ERROR(errno);
+ }
+ *num_bytes += ret;
+ while (ret > 0) {
+ if (ret < iov[i].iov_len - j) {
+ j += ret;
+ break;
+ }
+ ret -= iov[i].iov_len - j;
+ j = 0;
+ if (++i >= iovcnt)
+ break;
+ }
+ }
+ return 0;
+}
+
+/**
+ * Read from a non-blocking file descriptor into a single buffer.
+ *
+ * \param fd The file descriptor to read from.
+ * \param buf The buffer to read data to.
+ * \param sz The size of \a buf.
+ * \param rfds \see \ref readv_nonblock().
+ * \param num_bytes \see \ref readv_nonblock().
+ *
+ * This is a simple wrapper for readv_nonblock() which uses an iovec with a single
+ * buffer.
+ *
+ * \return The return value of the underlying call to readv_nonblock().
+ */
+int read_nonblock(int fd, void *buf, size_t sz, fd_set *rfds, size_t *num_bytes)
+{
+ struct iovec iov = {.iov_base = buf, .iov_len = sz};
+ return readv_nonblock(fd, &iov, 1, rfds, num_bytes);
+}
+
+/**
+ * Read a buffer and check its content for a pattern.
+ *
+ * \param fd The file descriptor to receive from.
+ * \param pattern The expected pattern.
+ * \param bufsize The size of the internal buffer.
+ * \param rfds Passed to read_nonblock().
+ *
+ * This function tries to read at most \a bufsize bytes from the non-blocking
+ * file descriptor \a fd. If at least \p strlen(\a pattern) bytes have been
+ * received, the beginning of the received buffer is compared with \a pattern,
+ * ignoring case.
+ *
+ * \return Positive if \a pattern was received, negative on errors, zero if no data
+ * was available to read.
+ *
+ * \sa \ref read_nonblock(), \sa strncasecmp(3).
+ */
+int read_pattern(int fd, const char *pattern, size_t bufsize, fd_set *rfds)
+{
+ size_t n, len;
+ char *buf = para_malloc(bufsize + 1);
+ int ret = read_nonblock(fd, buf, bufsize, rfds, &n);
+
+ buf[n] = '\0';
+ if (ret < 0)
+ goto out;
+ ret = 0;
+ if (n == 0)
+ goto out;
+ ret = -E_READ_PATTERN;
+ len = strlen(pattern);
+ if (n < len)
+ goto out;
+ if (strncasecmp(buf, pattern, len) != 0)
+ goto out;
+ ret = 1;
+out:
+ if (ret < 0) {
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ PARA_NOTICE_LOG("recvd %zu bytes: %s\n", n, buf);
+ }
+ free(buf);
+ return ret;
+}
+
+/**
+ * Check whether a file exists.
+ *
+ * \param fn The file name.
*
* \return Non-zero iff file exists.
*/
}
/**
- * paraslash's wrapper for select(2)
+ * Paraslash's wrapper for select(2).
*
* It calls select(2) (with no exceptfds) and starts over if select() was
* interrupted by a signal.
*
- * \param n the highest-numbered descriptor in any of the two sets, plus 1
- * \param readfds fds that should be checked for readability
- * \param writefds fds that should be checked for writablility
+ * \param n The highest-numbered descriptor in any of the two sets, plus 1.
+ * \param readfds fds that should be checked for readability.
+ * \param writefds fds that should be checked for writablility.
* \param timeout_tv upper bound on the amount of time elapsed before select()
- * returns
+ * returns.
*
- * \return The return value of the underlying select() call.
+ * \return The return value of the underlying select() call on success, the
+ * negative system error code on errors.
*
* All arguments are passed verbatim to select(2).
- * \sa select(2) select_tut(2)
+ * \sa select(2) select_tut(2).
*/
int para_select(int n, fd_set *readfds, fd_set *writefds,
struct timeval *timeout_tv)
{
- int ret, err;
- do {
+ int ret;
+ do
ret = select(n, readfds, writefds, NULL, timeout_tv);
- err = errno;
- } while (ret < 0 && err == EINTR);
+ while (ret < 0 && errno == EINTR);
if (ret < 0)
- PARA_CRIT_LOG("select error: %s, max_fileno: %d\n",
- strerror(err), n);
+ return -ERRNO_TO_PARA_ERROR(errno);
return ret;
}
/**
- * set a file descriptor to non-blocking mode
+ * Set a file descriptor to blocking mode.
*
- * \param fd The file descriptor
+ * \param fd The file descriptor.
*
- * \returns 1 on success, -E_F_GETFL, -E_F_SETFL, on errors.
+ * \return Standard.
*/
-int mark_fd_nonblock(int fd)
+__must_check int mark_fd_blocking(int fd)
{
int flags = fcntl(fd, F_GETFL);
if (flags < 0)
- return -E_F_GETFL;
- if (fcntl(fd, F_SETFL, ((long)flags) | O_NONBLOCK) < 0)
- return -E_F_SETFL;
+ return -ERRNO_TO_PARA_ERROR(errno);
+ flags = fcntl(fd, F_SETFL, ((long)flags) & ~O_NONBLOCK);
+ if (flags < 0)
+ return -ERRNO_TO_PARA_ERROR(errno);
return 1;
}
/**
- * set a file descriptor in a fd_set
+ * Set a file descriptor to non-blocking mode.
*
- * \param fd the file descriptor to be set
- * \param fds the file descriptor set
- * \param max_fileno highest-numbered file descriptor
+ * \param fd The file descriptor.
+ *
+ * \return Standard.
+ */
+__must_check int mark_fd_nonblocking(int fd)
+{
+ int flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -ERRNO_TO_PARA_ERROR(errno);
+ flags = fcntl(fd, F_SETFL, ((long)flags) | O_NONBLOCK);
+ if (flags < 0)
+ return -ERRNO_TO_PARA_ERROR(errno);
+ return 1;
+}
+
+/**
+ * Set a file descriptor in a fd_set.
+ *
+ * \param fd The file descriptor to be set.
+ * \param fds The file descriptor set.
+ * \param max_fileno Highest-numbered file descriptor.
*
* This wrapper for FD_SET() passes its first two arguments to \p FD_SET. Upon
* return, \a max_fileno contains the maximum of the old_value and \a fd.
*
- * \sa para_select
+ * \sa para_select.
*/
void para_fd_set(int fd, fd_set *fds, int *max_fileno)
{
-
- if (fd < 0 || fd >= FD_SETSIZE) {
- PARA_EMERG_LOG("fatal: tried to add invalid fd %d\n", fd);
- exit(EXIT_FAILURE);
- }
+ assert(fd >= 0 && fd < FD_SETSIZE);
#if 0
{
int flags = fcntl(fd, F_GETFL);
}
/**
-* paraslash's wrapper for fgets(3)
-* \param line pointer to the buffer to store the line
-* \param size the size of the buffer given by \a line
-* \param f the stream to read from
-*
-* \return Unlike the standard fgets() function, an integer value
-* is returned. On success, this function returns 1. On errors, -E_FGETS
-* is returned. A zero return value indicates an end of file condition.
-*/
+ * Paraslash's wrapper for fgets(3).
+ *
+ * \param line Pointer to the buffer to store the line.
+ * \param size The size of the buffer given by \a line.
+ * \param f The stream to read from.
+ *
+ * \return Unlike the standard fgets() function, an integer value
+ * is returned. On success, this function returns 1. On errors, -E_FGETS
+ * is returned. A zero return value indicates an end of file condition.
+ */
__must_check int para_fgets(char *line, int size, FILE *f)
{
again:
/**
* Paraslash's wrapper for mmap.
*
- * \param length number of bytes to mmap
- * \param prot either PROT_NONE or the bitwise OR of one or more of
- * PROT_EXEC PROT_READ PROT_WRITE
- * \param flags exactly one of MAP_SHARED and MAP_PRIVATE
- * \param fd the file to mmap from
- * \param offset mmap start
+ * \param length Number of bytes to mmap.
+ * \param prot Either PROT_NONE or the bitwise OR of one or more of
+ * PROT_EXEC PROT_READ PROT_WRITE.
+ * \param flags Exactly one of MAP_SHARED and MAP_PRIVATE.
+ * \param fd The file to mmap from.
+ * \param offset Mmap start.
+ * \param map Result pointer.
+ *
+ * \return Standard.
*
- * \return This function either returns a valid pointer to the mapped area
- * or calls exit() on errors.
+ * \sa mmap(2).
*/
-void *para_mmap(size_t length, int prot, int flags, int fd, off_t offset)
+int para_mmap(size_t length, int prot, int flags, int fd, off_t offset,
+ void *map)
{
- void *ret = mmap(NULL, length, prot, flags, fd, offset);
- if (ret != MAP_FAILED)
- return ret;
- PARA_EMERG_LOG("mmap failed: %s\n", strerror(errno));
- PARA_EMERG_LOG("length: %zu, flags: %d, fd: %d, offset: %zu\n",
- length, flags, fd, (size_t)offset);
- exit(EXIT_FAILURE);
+ void **m = map;
+
+ errno = EINVAL;
+ if (!length)
+ goto err;
+ *m = mmap(NULL, length, prot, flags, fd, offset);
+ if (*m != MAP_FAILED)
+ return 1;
+err:
+ *m = NULL;
+ return -ERRNO_TO_PARA_ERROR(errno);
}
/**
* \param flags The usual open(2) flags.
* \param mode Specifies the permissions to use.
*
- * The mode parameter must be specified when O_CREAT is in the flags, and is ignored
- * otherwise.
+ * The mode parameter must be specified when O_CREAT is in the flags, and is
+ * ignored otherwise.
*
- * \return Positive on success, negative on errors.
+ * \return The file descriptor on success, negative on errors.
*
* \sa open(2).
*/
if (ret >= 0)
return ret;
- switch (errno) {
- case EEXIST:
- ret = -E_EXIST;
- break;
- case EISDIR:
- ret = -E_ISDIR;
- break;
- case ENOENT:
- ret = -E_NOENT;
- break;
- case EPERM:
- ret = -E_OPEN_PERM;
- break;
- };
- PARA_ERROR_LOG("failed to open %s: %s\n", path, strerror(errno));
- return ret;
+ return -ERRNO_TO_PARA_ERROR(errno);
+}
+
+/**
+ * Wrapper for chdir(2).
+ *
+ * \param path The specified directory.
+ *
+ * \return Standard.
+ */
+int para_chdir(const char *path)
+{
+ int ret = chdir(path);
+
+ if (ret >= 0)
+ return 1;
+ return -ERRNO_TO_PARA_ERROR(errno);
}
/**
* \param dir Result pointer.
* \param cwd File descriptor of the current working directory.
*
- * \return Positive on success, negative on errors.
+ * \return Standard.
*
* Opening the current directory (".") and calling fchdir() to return is
* usually faster and more reliable than saving cwd in some buffer and calling
* \sa getcwd(3).
*
*/
-int para_opendir(const char *dirname, DIR **dir, int *cwd)
+static int para_opendir(const char *dirname, DIR **dir, int *cwd)
{
int ret;
return ret;
*cwd = ret;
}
- ret = -E_CHDIR;
- if (chdir(dirname) < 0)
+ ret = para_chdir(dirname);
+ if (ret < 0)
goto close_cwd;
- ret = -E_OPENDIR;
*dir = opendir(".");
- if (!*dir)
- goto change_to_orig_dir;
- return 1;
-/* Ignore return value of fchdir() and close(). We're busted anyway. */
-change_to_orig_dir:
- if (cwd)
- fchdir(*cwd);
+ if (*dir)
+ return 1;
+ ret = -ERRNO_TO_PARA_ERROR(errno);
+ /* Ignore return value of fchdir() and close(). We're busted anyway. */
+ if (cwd) {
+ int __a_unused ret2 = fchdir(*cwd); /* STFU, gcc */
+ }
close_cwd:
if (cwd)
close(*cwd);
/**
* A wrapper for fchdir().
*
- * \param fd An open file descriptor
+ * \param fd An open file descriptor.
*
- * \return Positive on success, negative on errors.
+ * \return Standard.
*/
-int para_fchdir(int fd)
+static int para_fchdir(int fd)
{
if (fchdir(fd) < 0)
- return -E_FCHDIR;
+ return -ERRNO_TO_PARA_ERROR(errno);
return 1;
}
* \param path Name of the directory to create.
* \param mode The permissions to use.
*
- * \return positive on success, negative on errors.
+ * \return Standard.
*/
int para_mkdir(const char *path, mode_t mode)
{
if (!mkdir(path, mode))
return 1;
- if (errno == EEXIST)
- return -E_EXIST;
- if (errno == ENOSPC)
- return -E_NOSPC;
- if (errno == ENOTDIR)
- return -E_NOTDIR;
- if (errno == EPERM)
- return -E_MKDIR_PERM;
- return -E_MKDIR;
+ return -ERRNO_TO_PARA_ERROR(errno);
+}
+
+/**
+ * Open a file and map it into memory.
+ *
+ * \param path Name of the regular file to map.
+ * \param open_mode Either \p O_RDONLY or \p O_RDWR.
+ * \param map On success, the mapping is returned here.
+ * \param size size of the mapping.
+ * \param fd_ptr The file descriptor of the mapping.
+ *
+ * If \a fd_ptr is \p NULL, the file descriptor resulting from the underlying
+ * open call is closed after mmap(). Otherwise the file is kept open and the
+ * file descriptor is returned in \a fd_ptr.
+ *
+ * \return Standard.
+ *
+ * \sa para_open(), mmap(2).
+ */
+int mmap_full_file(const char *path, int open_mode, void **map,
+ size_t *size, int *fd_ptr)
+{
+ int fd, ret, mmap_prot, mmap_flags;
+ struct stat file_status;
+
+ if (open_mode == O_RDONLY) {
+ mmap_prot = PROT_READ;
+ mmap_flags = MAP_PRIVATE;
+ } else {
+ mmap_prot = PROT_READ | PROT_WRITE;
+ mmap_flags = MAP_SHARED;
+ }
+ ret = para_open(path, open_mode, 0);
+ if (ret < 0)
+ return ret;
+ fd = ret;
+ if (fstat(fd, &file_status) < 0) {
+ ret = -ERRNO_TO_PARA_ERROR(errno);
+ goto out;
+ }
+ *size = file_status.st_size;
+ /*
+ * If the file is empty, *size is zero and mmap() would return EINVAL
+ * (Invalid argument). This error is common enough to spend an extra
+ * error code which explicitly states the problem.
+ */
+ ret = -E_EMPTY;
+ if (*size == 0)
+ goto out;
+ /*
+ * If fd refers to a directory, mmap() returns ENODEV (No such device),
+ * at least on Linux. "Is a directory" seems to be more to the point.
+ */
+ ret = -ERRNO_TO_PARA_ERROR(EISDIR);
+ if (S_ISDIR(file_status.st_mode))
+ goto out;
+
+ ret = para_mmap(*size, mmap_prot, mmap_flags, fd, 0, map);
+out:
+ if (ret < 0 || !fd_ptr)
+ close(fd);
+ else
+ *fd_ptr = fd;
+ return ret;
+}
+
+/**
+ * A wrapper for munmap(2).
+ *
+ * \param start The start address of the memory mapping.
+ * \param length The size of the mapping.
+ *
+ * \return Standard.
+ *
+ * \sa munmap(2), mmap_full_file().
+ */
+int para_munmap(void *start, size_t length)
+{
+ int err;
+
+ if (!start)
+ return 0;
+ if (munmap(start, length) >= 0)
+ return 1;
+ err = errno;
+ PARA_ERROR_LOG("munmap (%p/%zu) failed: %s\n", start, length,
+ strerror(err));
+ return -ERRNO_TO_PARA_ERROR(err);
+}
+
+/**
+ * Check a file descriptor for writability.
+ *
+ * \param fd The file descriptor.
+ *
+ * \return positive if fd is ready for writing, zero if it isn't, negative if
+ * an error occurred.
+ */
+
+int write_ok(int fd)
+{
+ struct timeval tv;
+ fd_set wfds;
+
+ FD_ZERO(&wfds);
+ FD_SET(fd, &wfds);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ return para_select(fd + 1, NULL, &wfds, &tv);
+}
+
+/**
+ * Ensure that file descriptors 0, 1, and 2 are valid.
+ *
+ * Common approach that opens /dev/null until it gets a file descriptor greater
+ * than two.
+ *
+ * \sa okir's Black Hats Manual.
+ */
+void valid_fd_012(void)
+{
+ while (1) {
+ int fd = open("/dev/null", O_RDWR);
+ if (fd < 0)
+ exit(EXIT_FAILURE);
+ if (fd > 2) {
+ close(fd);
+ break;
+ }
+ }
+}
+
+/**
+ * Traverse the given directory recursively.
+ *
+ * \param dirname The directory to traverse.
+ * \param func The function to call for each entry.
+ * \param private_data Pointer to an arbitrary data structure.
+ *
+ * For each regular file under \a dirname, the supplied function \a func is
+ * called. The full path of the regular file and the \a private_data pointer
+ * are passed to \a func. Directories for which the calling process has no
+ * permissions to change to are silently ignored.
+ *
+ * \return Standard.
+ */
+int for_each_file_in_dir(const char *dirname,
+ int (*func)(const char *, void *), void *private_data)
+{
+ DIR *dir;
+ struct dirent *entry;
+ int cwd_fd, ret2, ret = para_opendir(dirname, &dir, &cwd_fd);
+
+ if (ret < 0)
+ return ret == -ERRNO_TO_PARA_ERROR(EACCES)? 1 : ret;
+ /* scan cwd recursively */
+ while ((entry = readdir(dir))) {
+ mode_t m;
+ char *tmp;
+ struct stat s;
+
+ if (!strcmp(entry->d_name, "."))
+ continue;
+ if (!strcmp(entry->d_name, ".."))
+ continue;
+ if (lstat(entry->d_name, &s) == -1)
+ continue;
+ m = s.st_mode;
+ if (!S_ISREG(m) && !S_ISDIR(m))
+ continue;
+ tmp = make_message("%s/%s", dirname, entry->d_name);
+ if (!S_ISDIR(m)) {
+ ret = func(tmp, private_data);
+ free(tmp);
+ if (ret < 0)
+ goto out;
+ continue;
+ }
+ /* directory */
+ ret = for_each_file_in_dir(tmp, func, private_data);
+ free(tmp);
+ if (ret < 0)
+ goto out;
+ }
+ ret = 1;
+out:
+ closedir(dir);
+ ret2 = para_fchdir(cwd_fd);
+ if (ret2 < 0 && ret >= 0)
+ ret = ret2;
+ close(cwd_fd);
+ return ret;
}