| /* Simple subrs. |
| Copyright (C) 2019 Free Software Foundation, Inc. |
| |
| This file is part of libctf. |
| |
| libctf 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 3, 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; see the file COPYING. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <ctf-impl.h> |
| #ifdef HAVE_MMAP |
| #include <sys/mman.h> |
| #endif |
| #include <sys/types.h> |
| #include <stdarg.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #ifndef ENOTSUP |
| #define ENOTSUP ENOSYS |
| #endif |
| |
| int _libctf_version = CTF_VERSION; /* Library client version. */ |
| int _libctf_debug = 0; /* Debugging messages enabled. */ |
| |
| /* Private, read-only mmap from a file, with fallback to copying. |
| |
| No handling of page-offset issues at all: the caller must allow for that. */ |
| |
| _libctf_malloc_ void * |
| ctf_mmap (size_t length, size_t offset, int fd) |
| { |
| void *data; |
| |
| #ifdef HAVE_MMAP |
| data = mmap (NULL, length, PROT_READ, MAP_PRIVATE, fd, offset); |
| if (data == MAP_FAILED) |
| data = NULL; |
| #else |
| if ((data = malloc (length)) != NULL) |
| { |
| if (ctf_pread (fd, data, length, offset) <= 0) |
| { |
| free (data); |
| data = NULL; |
| } |
| } |
| #endif |
| return data; |
| } |
| |
| void |
| ctf_munmap (void *buf, size_t length _libctf_unused_) |
| { |
| #ifdef HAVE_MMAP |
| (void) munmap (buf, length); |
| #else |
| free (buf); |
| #endif |
| } |
| |
| ssize_t |
| ctf_pread (int fd, void *buf, ssize_t count, off_t offset) |
| { |
| ssize_t len; |
| size_t acc = 0; |
| char *data = (char *) buf; |
| |
| #ifdef HAVE_PREAD |
| while (count > 0) |
| { |
| errno = 0; |
| if (((len = pread (fd, data, count, offset)) < 0) && |
| errno != EINTR) |
| return len; |
| if (errno == EINTR) |
| continue; |
| |
| acc += len; |
| if (len == 0) /* EOF. */ |
| return acc; |
| |
| count -= len; |
| offset += len; |
| data += len; |
| } |
| return acc; |
| #else |
| off_t orig_off; |
| |
| if ((orig_off = lseek (fd, 0, SEEK_CUR)) < 0) |
| return -1; |
| if ((lseek (fd, offset, SEEK_SET)) < 0) |
| return -1; |
| |
| while (count > 0) |
| { |
| errno = 0; |
| if (((len = read (fd, data, count)) < 0) && |
| errno != EINTR) |
| return len; |
| if (errno == EINTR) |
| continue; |
| |
| acc += len; |
| if (len == 0) /* EOF. */ |
| break; |
| |
| count -= len; |
| data += len; |
| } |
| if ((lseek (fd, orig_off, SEEK_SET)) < 0) |
| return -1; /* offset is smashed. */ |
| #endif |
| |
| return acc; |
| } |
| |
| const char * |
| ctf_strerror (int err) |
| { |
| return (const char *) (strerror (err)); |
| } |
| |
| /* Set the CTF library client version to the specified version. If version is |
| zero, we just return the default library version number. */ |
| int |
| ctf_version (int version) |
| { |
| if (version < 0) |
| { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| if (version > 0) |
| { |
| /* Dynamic version switching is not presently supported. */ |
| if (version != CTF_VERSION) |
| { |
| errno = ENOTSUP; |
| return -1; |
| } |
| ctf_dprintf ("ctf_version: client using version %d\n", version); |
| _libctf_version = version; |
| } |
| |
| return _libctf_version; |
| } |
| |
| void |
| libctf_init_debug (void) |
| { |
| static int inited; |
| if (!inited) |
| { |
| _libctf_debug = getenv ("LIBCTF_DEBUG") != NULL; |
| inited = 1; |
| } |
| } |
| |
| void ctf_setdebug (int debug) |
| { |
| /* Ensure that libctf_init_debug() has been called, so that we don't get our |
| debugging-on-or-off smashed by the next call. */ |
| |
| libctf_init_debug(); |
| _libctf_debug = debug; |
| ctf_dprintf ("CTF debugging set to %i\n", debug); |
| } |
| |
| int ctf_getdebug (void) |
| { |
| return _libctf_debug; |
| } |
| |
| _libctf_printflike_ (1, 2) |
| void ctf_dprintf (const char *format, ...) |
| { |
| if (_libctf_debug) |
| { |
| va_list alist; |
| |
| va_start (alist, format); |
| fflush (stdout); |
| (void) fputs ("libctf DEBUG: ", stderr); |
| (void) vfprintf (stderr, format, alist); |
| va_end (alist); |
| } |
| } |