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SPAWN exit status different from shell exit status. [message #88872]

Mon, 30 June 2014 07:04

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Hello,

I'm trying to run a compiled executable within IDL.

When I run the exe in a regular shell I get the following:

$ myexe

Program received signal SIGSEGV: Segmentation fault - invalid memory
reference.

Backtrace for this error:
#0 0x7FD97E7ADA77
#1 0x7FD97E7AE07E
#2 0x3000C3299F
#3 0x45EBBB in sub1_
#4 0x47688D in sub2_
#5 0x409A9F in sub3_
#6 0x42BABA in MAIN__ at myprog.f90:0
Segmentation fault (core dumped)

If I inspect the exit value I see:

$ echo $?
139

Now, if I do the same thing inside an IDL SPAWN command I get the following:

IDL> SPAWN, 'myexe', stdout, stderr, EXIT_STATUS = exit_stat

IDL> print, exit_stat
0

IDL> help, stderr
STDERR STRING = Array[11]

IDL> print, stderr, format='(a)'

Program received signal SIGSEGV: Segmentation fault - invalid memory
reference.

Backtrace for this error:
#0 0x7F39A545DA77
#1 0x7F39A545E07E
#2 0x3000C3299F
#3 0x45EBBB in sub1_
#4 0x47688D in sub2_
#5 0x409A9F in sub3_
#6 0x42BABA in MAIN__ at myprog.f90:0

So it's still failing but the exit_status is always 0 (i.e. successful)

I've tried the command with /SH and /NOSHELL and get the same result.

Does anyone have any idea why SPAWN is not setting the EXIT_STATUS
correctly?

cheers,

paulv

p.s.
IDL> print, !VERSION
{ x86_64 linux unix linux 8.3 Nov 15 2013 64 64}

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Re: SPAWN exit status different from shell exit status. [message #88876 is a reply to message #88872]

Mon, 30 June 2014 09:31

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

On Monday, June 30, 2014 4:04:52 PM UTC+2, Paul van Delst wrote:
> Hello,
>
>
>
> I'm trying to run a compiled executable within IDL.
>
>
>
> When I run the exe in a regular shell I get the following:
>
>
>
> $ myexe
>
>
>
> Program received signal SIGSEGV: Segmentation fault - invalid memory
>
> reference.
>
>
>
> Backtrace for this error:
>
> #0 0x7FD97E7ADA77
>
> #1 0x7FD97E7AE07E
>
> #2 0x3000C3299F
>
> #3 0x45EBBB in sub1_
>
> #4 0x47688D in sub2_
>
> #5 0x409A9F in sub3_
>
> #6 0x42BABA in MAIN__ at myprog.f90:0
>
> Segmentation fault (core dumped)
>
>
>
>
>
> If I inspect the exit value I see:
>
>
>
>
>
> $ echo $?
>
> 139
>
>
>
>
>
> Now, if I do the same thing inside an IDL SPAWN command I get the following:
>
>
>
> IDL> SPAWN, 'myexe', stdout, stderr, EXIT_STATUS = exit_stat
>
>
>
> IDL> print, exit_stat
>
> 0
>
>
>
> IDL> help, stderr
>
> STDERR STRING = Array[11]
>
>
>
> IDL> print, stderr, format='(a)'
>
>
>
> Program received signal SIGSEGV: Segmentation fault - invalid memory
>
> reference.
>
>
>
> Backtrace for this error:
>
> #0 0x7F39A545DA77
>
> #1 0x7F39A545E07E
>
> #2 0x3000C3299F
>
> #3 0x45EBBB in sub1_
>
> #4 0x47688D in sub2_
>
> #5 0x409A9F in sub3_
>
> #6 0x42BABA in MAIN__ at myprog.f90:0
>
>
>
> So it's still failing but the exit_status is always 0 (i.e. successful)
>
>
>
> I've tried the command with /SH and /NOSHELL and get the same result.
>
>
>
> Does anyone have any idea why SPAWN is not setting the EXIT_STATUS
>
> correctly?
>
>
>
> cheers,
>
>
>
> paulv
>
>
>
> p.s.
>
> IDL> print, !VERSION
>
> { x86_64 linux unix linux 8.3 Nov 15 2013 64 64}

After IDL documentation, the 3rd argument and keyword EXIT_STATUS are mutually exclusive: check your STDERR argument, you should find 139 herein.
alx.

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Re: SPAWN exit status different from shell exit status. [message #88889 is a reply to message #88872]

Tue, 01 July 2014 11:49

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Monday, June 30, 2014 10:04:52 AM UTC-4, Paul van Delst wrote:
> Does anyone have any idea why SPAWN is not setting the EXIT_STATUS
> correctly?

Works for me.
IDL> spawn, 'bash -c "exit 10"', exit_status=exit_status
IDL> print, exit_status
----> 10

I tried IDL 7 and IDL 8, Linux and Mac.

Craig

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