22da50cfc8
trying to open files rather than giving up when it encounters an error. ENOENT errors are not reported. As a result, files that are moved away then recreated are not at risk of being 'lost' to tail. Files that are recreated and temporarily have unreadable permissions will be shown when they are fixed. This behaviour is consistent with the GNU version of tail but without the verbiage that goes with the GNU version. This change also fixes error messages accompanying -f and -F. They no longer report problems with (null)! MFC after: 3 weeks
76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)extern.h 8.1 (Berkeley) 6/6/93
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*
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* $FreeBSD$
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*/
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#define WR(p, size) do { \
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if (write(STDOUT_FILENO, p, size) != (ssize_t)size) \
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oerr(); \
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} while(0)
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#define TAILMAPLEN (4<<20)
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struct mapinfo {
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off_t mapoff;
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off_t maxoff;
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size_t maplen;
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char *start;
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int fd;
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};
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struct file_info {
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FILE *fp;
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char *file_name;
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struct stat st;
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};
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typedef struct file_info file_info_t;
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enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE };
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void follow(file_info_t *, enum STYLE, off_t);
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void forward(FILE *, const char *, enum STYLE, off_t, struct stat *);
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void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *);
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int bytes(FILE *, const char *, off_t);
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int lines(FILE *, const char *, off_t);
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void ierr(const char *);
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void oerr(void);
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int mapprint(struct mapinfo *, off_t, off_t);
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int maparound(struct mapinfo *, off_t);
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extern int Fflag, fflag, qflag, rflag, rval, no_files;
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