sh：1：/my_path/ompi-1.1/compiler/ompi：运行C程序时权限被拒绝

Question

I have installed a software named "OMPi" (after make , it generated two executable file ompicc and ompi , and you can use ompicc -x file to do something, and ompi will be called by ompicc ).

When I run the command ompicc ~/Documents/example.c in the directory "/my_path/ompi-1.1/compiler" ( ompicc is here and ompi is in the sub_path "./ompi/"), an error occurred sh: 1: /my_path/ompi-1.1/compiler/ompi: permission denied . But when I ran the same command in any other directories, the error didn't occur.

sudo chmod 777 -R ompi-1.1 is no use.

I think it may be because the sub_path "./ompi/" get the same name with file ompi . So, I created a directory named "ompi/" in home_path, and then ran the above command. To my surprise, the error didn't occur. It seems that the error only occur when I run the command in the directory: /my_path/ompi-1.1/compiler/

information in terminal

Answer 1

From the looks of it (I have briefly checked ompi's source code), the ompi program is expected by ompicc to be in the same directory. It worked fine after you had created /ompi/ in home directory, because you still had executable of the same name in the same directory as ompicc . It doesn't work in the directory you specified because there's only one ompi there which is a directory.

Line that does the execution in ompicc.c (the constructed command is then ran by a system() call:

sprintf(cmd, "%s%s%s \"%s.pc\" __ompi__%s%s%s%s%s%s%s %s > \"%s\"%s",
        usegdb ? "gdb " : "", /* Run gdb instead of running _ompi directly */
        RealOmpiName,
        usegdb ? " -ex 'set args" : "", /* Pass the arguments */
       /* ...further arguments here... */

To confirm that RealOmpiName is 'ompi' i followed the program and RealOmpiName is traced back to (through external symbol OmpiName) Makefile.am:

-DOmpiName='"_@PACKAGE_TARNAME@"' \

Which then is used like this (to install the software):

cp -f ompi $(DESTDIR)$(bindir)/_@PACKAGE_TARNAME@
cp -f ompicc $(DESTDIR)$(bindir)/@PACKAGE_TARNAME@cc

I think the installer wouldn't put the two programs together if it didn't require the two to be in the same directory in the first place.

Solution: ompi and ompicc have to be in the same folder/directory.