6b02121d88
The pipefail option allows checking the exit status of all commands in a
pipeline more easily, at a limited cost of complexity in sh itself. It works
similarly to the option in bash, ksh93 and mksh.
Like ksh93 and unlike bash and mksh, the state of the option is saved when a
pipeline is started. Therefore, even in the case of commands like
A | B &
a later change of the option does not change the exit status, the same way
(A | B) &
works.
Since SIGPIPE is not handled specially, more work in the script is required
for a proper exit status for pipelines containing commands such as head that
may terminate successfully without reading all input. This can be something
like
(
cmd1
r=$?
if [ "$r" -gt 128 ] && [ "$(kill -l "$r")" = PIPE ]; then
exit 0
else
exit "$r"
fi
) | head
PR: 224270
Relnotes: yes
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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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. 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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* @(#)options.h 8.2 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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struct shparam {
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int nparam; /* # of positional parameters (without $0) */
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unsigned char malloc; /* if parameter list dynamically allocated */
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unsigned char reset; /* if getopts has been reset */
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char **p; /* parameter list */
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char **optp; /* parameter list for getopts */
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char **optnext; /* next parameter to be processed by getopts */
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char *optptr; /* used by getopts */
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};
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#define eflag optval[0]
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#define fflag optval[1]
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#define Iflag optval[2]
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#define iflag optval[3]
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#define mflag optval[4]
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#define nflag optval[5]
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#define sflag optval[6]
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#define xflag optval[7]
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#define vflag optval[8]
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#define Vflag optval[9]
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#define Eflag optval[10]
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#define Cflag optval[11]
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#define aflag optval[12]
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#define bflag optval[13]
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#define uflag optval[14]
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#define privileged optval[15]
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#define Tflag optval[16]
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#define Pflag optval[17]
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#define hflag optval[18]
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#define nologflag optval[19]
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#define pipefailflag optval[20]
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#define NSHORTOPTS 19
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#define NOPTS 21
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extern char optval[NOPTS];
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extern const char optletter[NSHORTOPTS];
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#ifdef DEFINE_OPTIONS
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char optval[NOPTS];
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const char optletter[NSHORTOPTS] = "efIimnsxvVECabupTPh";
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static const unsigned char optname[] =
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"\007errexit"
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"\006noglob"
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"\011ignoreeof"
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"\013interactive"
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"\007monitor"
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"\006noexec"
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"\005stdin"
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"\006xtrace"
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"\007verbose"
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"\002vi"
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"\005emacs"
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"\011noclobber"
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"\011allexport"
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"\006notify"
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"\007nounset"
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"\012privileged"
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"\012trapsasync"
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"\010physical"
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"\010trackall"
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"\005nolog"
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"\010pipefail"
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;
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#endif
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extern char *minusc; /* argument to -c option */
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extern char *arg0; /* $0 */
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extern struct shparam shellparam; /* $@ */
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extern char **argptr; /* argument list for builtin commands */
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extern char *shoptarg; /* set by nextopt */
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extern char *nextopt_optptr; /* used by nextopt */
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void procargs(int, char **);
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void optschanged(void);
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void freeparam(struct shparam *);
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int nextopt(const char *);
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void getoptsreset(const char *);
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