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Re: execlp/execvp needs case-correct PATH

Am 10.02.2015 um 10:27 schrieb Corinna Vinschen:
On Feb  9 21:49, Thomas Wolff wrote:
Am 09.02.2015 um 11:17 schrieb Corinna Vinschen:
On Feb  9 00:04, Thomas Wolff wrote:
With a Windows case sensitive file system (and according mount flags
for /cygdrive), the PATH does not properly reflect casing of the actual
directories (e.g. C:\WINDOWS vs. C:\Windows, thanks MS...).
However, the shell finds programs anyway, like e.g. notepad.
The exec*p system calls, on the other hand, do not find a program in this
case as demonstrated by the attached test program.
This is in contrast to the Linux (and POSIX?) manual page which claims
âThe execlp(), execvp(), and execvpe() functions duplicate the actions
of the shell in searching for an executable file ââ
Sorry, I forgot one detail: I added /cygdrive/c/Windows/System32 to my path
so the shell will find it, but yet execlp does not find it.
Which makes sense, given that notepad is not in C:\Windows\System32, but in C:\Windows.
On my systems (Windows 7 Professional/Ultimate) itâs in both C:\Windows and C:\Windows\System32
(otherwise the shell wouldnât have found it after adding to the path).

However, I could resolve the issue partly by putting
/cygdrive/c/Windows (or ../System32) in the path *before* the bogus
/cygdrive/c/WINDOWS - weird, but this way exec*p works.

With the old setting (bogus first in path), apparently/assumedly exec*p somehow finds the file in /cygdrive/c/WINDOWS but then cannot start it from there because of the case mis-match.
Thereâs still the inconsistency with shell behaviour.


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