*Synopsis*: /bin/sh: expansion of ${1+"$@"} is incorrect
CR 7003032 changed on Nov 29 2010 by <User 1-5Q-1267>
=== Field ============ === New Value ============= === Old Value =============
Category shell opensolaris
SubCategory korn93 triage-queue
====================== =========================== ===========================
*Change Request ID*: 7003032
*Synopsis*: /bin/sh: expansion of ${1+"$@"} is incorrect
Product: solaris
Category: shell
Subcategory: korn93
Type: Defect
Subtype:
Status: 1-Dispatched
Substatus:
Priority: 3-Medium
Introduced In Release:
Introduced In Build:
Responsible Engineer:
Keywords: opensolaris
=== *Description* ============================================================
Category
shell
Sub-Category
bourne
Description
In /bin/sh shell scripts, the expansion of ${1+"$@"} is missing the last
argument
if that argument is an empty string.
According to POSIX:2008
<http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html>,
"$@" and ${1+"$@"} should expand to the list of arguments, one by one, not
combined together, and not subject to word splitting. The second form is
commonly used as a workaround for platforms where the first form does not work,
see
<http://www.gnu.org/software/autoconf/manual/html_node/Shell-Substitutions.html>.
Frequency
Always
Regression
solaris_10
Steps to Reproduce
1) Save this as args.c
========================== args.c ==============================
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char* argv[])
{
int i;
printf("argc = %d\n",argc);
for (i = 0; i < argc; i++) printf("argv[%d] = %s\n",i,argv[i]);
exit(0);
}
=================================================================
2) Compile it: gcc -o $HOME/bin/args args.c
3) Save this as args-caller.sh
======================== args-caller.sh =========================
#! /bin/sh
exec $HOME/bin/args ${1+"$@"} end
=================================================================
Make it executable: chmod a+x args-caller.sh
4) Run it with various arguments:
$ ./args-caller.sh ''
Actual output:
argc = 2
argv[0] = /home/bruno/bin/args
argv[1] = end
Expected output:
argc = 3
argv[0] = /home/bruno/bin/args
argv[1] =
argv[2] = end
$ ./args-caller.sh foo '' ''
Actual output:
argc = 4
argv[0] = /home/bruno/bin/args
argv[1] = foo
argv[2] =
argv[3] = end
Expected output:
argc = 5
argv[0] = /home/bruno/bin/args
argv[1] = foo
argv[2] =
argv[3] =
argv[4] = end
Expected Result
All arguments should be passed to the program through exec.
Actual Result
The last argument is not being passed to the program through exec, if it is
an
empty string.
Error Message(s)
Test Case
1) Save this as args.c
========================== args.c ==============================
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char* argv[])
{
int i;
printf("argc = %d\n",argc);
for (i = 0; i < argc; i++) printf("argv[%d] = %s\n",i,argv[i]);
exit(0);
}
=================================================================
2) Compile it: gcc -o $HOME/bin/args args.c
3) Save this as args-caller.sh
======================== args-caller.sh =========================
#! /bin/sh
exec $HOME/bin/args ${1+"$@"} end
=================================================================
Make it executable: chmod a+x args-caller.sh
Workaround
Use /bin/bash instead of /bin/sh.
Additional configuration information
Solaris 11 Express, snv_151a.
/bin/sh is a symbolic link to i86/ksh93.
*** (#1 of 1): 2010-11-29 03:11:42 GMT+00:00 <User 1-9HOB9N>
=== *Public Comments* ========================================================
=== *Workaround* =============================================================
=== *Additional Details* =====================================================
Targeted Release:
Commit To Fix In Build:
Fixed In Build:
Integrated In Build:
Verified In Build:
See Also:
Duplicate of:
Hooks:
Hook1:
Hook2:
Hook3:
Hook4:
Hook5:
Hook6: <email address omitted>
Program Management:
Root Cause:
Fix Affects Documentation: No
Fix Affects Localization: No
=== *History* ================================================================
Date Submitted: 2010-11-29 03:11:40 GMT+00:00
Submitted By: <User 1-9HOB9N>
Status Changed Date Updated Updated By
=== *Service Request* ========================================================
Impact: Significant
Functionality: Secondary
Severity: 3
Product Name: solaris
Product Release: solaris_nevada
Product Build: snv_151
Operating System: solaris_nevada
Hardware: x86
Submitted Date: 2010-11-29 03:11:42 GMT+00:00
=== *Multiple Release (MR) Cluster* - 0 ======================================
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