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7a283d9cf5
I would like to add more code to nat/linux-osdata.c that reads an entire
file from /proc or /sys and processes it as a string afterwards. I
would like to avoid duplicating the somewhat error-prone code that reads
an entire file to a buffer. I think we should have a utility function
that does that.
Add read_file_to_string to gdbsupport/filestuff.{c,h}, and make
linux_common_core_of_thread use it. I want to make the new function
return an std::string, and because strtok doesn't play well with
std::string (it requires a `char *`, std::string::c_str returns a `const
char *`), change linux_common_core_of_thread to use std::string methods
instead.
Approved-By: Tom Tromey <tom@tromey.com>
Change-Id: I1793fda72a82969c28b944a84acb953f74c9230a
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
/* Low-level file-handling.
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Copyright (C) 2012-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_FILESTUFF_H
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#define COMMON_FILESTUFF_H
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#include <dirent.h>
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#include <fcntl.h>
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#include "gdb_file.h"
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#include "scoped_fd.h"
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/* Note all the file descriptors which are open when this is called.
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These file descriptors will not be closed by close_most_fds. */
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extern void notice_open_fds (void);
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/* Mark a file descriptor as inheritable across an exec. */
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extern void mark_fd_no_cloexec (int fd);
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/* Mark a file descriptor as no longer being inheritable across an
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exec. This is only meaningful when FD was previously passed to
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mark_fd_no_cloexec. */
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extern void unmark_fd_no_cloexec (int fd);
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/* Close all open file descriptors other than those marked by
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'notice_open_fds', and stdin, stdout, and stderr. Errors that
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occur while closing are ignored. */
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extern void close_most_fds (void);
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/* Like 'open', but ensures that the returned file descriptor has the
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close-on-exec flag set. */
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extern scoped_fd gdb_open_cloexec (const char *filename, int flags,
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/* mode_t */ unsigned long mode);
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/* Like mkstemp, but ensures that the file descriptor is
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close-on-exec. */
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static inline scoped_fd
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gdb_mkostemp_cloexec (char *name_template, int flags = 0)
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{
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/* gnulib provides a mkostemp replacement if needed. */
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return scoped_fd (mkostemp (name_template, flags | O_CLOEXEC));
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}
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/* Convenience wrapper for the above, which takes the filename as an
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std::string. */
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static inline scoped_fd
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gdb_open_cloexec (const std::string &filename, int flags,
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/* mode_t */ unsigned long mode)
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{
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return gdb_open_cloexec (filename.c_str (), flags, mode);
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}
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/* Like 'fopen', but ensures that the returned file descriptor has the
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close-on-exec flag set. */
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extern gdb_file_up gdb_fopen_cloexec (const char *filename,
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const char *opentype);
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/* Convenience wrapper for the above, which takes the filename as an
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std::string. */
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static inline gdb_file_up
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gdb_fopen_cloexec (const std::string &filename, const char *opentype)
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{
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return gdb_fopen_cloexec (filename.c_str (), opentype);
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}
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/* Like 'socketpair', but ensures that the returned file descriptors
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have the close-on-exec flag set. */
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extern int gdb_socketpair_cloexec (int domain, int style, int protocol,
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int filedes[2]);
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/* Like 'socket', but ensures that the returned file descriptor has
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the close-on-exec flag set. */
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extern int gdb_socket_cloexec (int domain, int style, int protocol);
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/* Like 'pipe', but ensures that the returned file descriptors have
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the close-on-exec flag set. */
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extern int gdb_pipe_cloexec (int filedes[2]);
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struct gdb_dir_deleter
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{
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void operator() (DIR *dir) const
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{
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closedir (dir);
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}
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};
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/* A unique pointer to a DIR. */
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typedef std::unique_ptr<DIR, gdb_dir_deleter> gdb_dir_up;
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/* Return true if the file NAME exists and is a regular file.
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If the result is false then *ERRNO_PTR is set to a useful value assuming
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we're expecting a regular file. */
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extern bool is_regular_file (const char *name, int *errno_ptr);
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/* A cheap (as in low-quality) recursive mkdir. Try to create all the
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parents directories up to DIR and DIR itself. Stop if we hit an
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error along the way. There is no attempt to remove created
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directories in case of failure.
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Returns false on failure and sets errno. */
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extern bool mkdir_recursive (const char *dir);
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/* Read the entire content of file PATH into an std::string. */
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extern gdb::optional<std::string> read_text_file_to_string (const char *path);
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#endif /* COMMON_FILESTUFF_H */
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