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cde/src/lib/libast/comp/execvpe.c
Martijn Dekker 3de4da5afb Remove Microsoft/Cygwin import/export nonsense
Windows/Cygwin requires onerous special handling and the definition
of additional _imp__* symbols to import/export symbols between
dynamically linked binaries. Its support in AST used a lot of
macros and code obfuscation. In the features/common test for this,
AT&T called this the "Microsoft import/export nonsense".

They're right, it's nonsense. Somehow, Microsoft's POSIX layer,
SFU/Interix, always managed without it. No one has time to maintain
this (especially considering how incredibly sluggish Cygwin is).
And in fact, it had already fallen victim to bit rot; I confirmed
this in my early experiments with reintroducing dynamic library
support. No one has time to fix it, either.

So, my apologies to any Cygwin fans; ksh 93u+m will never support
dynamically loadable built-ins on Cygwin, even when I do manage to
reintroduce dynamic linking properly.
2022-07-21 23:27:37 +02:00

70 lines
2.4 KiB
C

/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2011 AT&T Intellectual Property *
* Copyright (c) 2020-2022 Contributors to ksh 93u+m *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#include <ast_lib.h>
#if _lib_execvpe
#include <ast.h>
NoN(execvpe)
#else
#include <ast.h>
#include <errno.h>
extern int
execvpe(const char* name, char* const argv[], char* const envv[])
{
register const char* path = name;
char buffer[PATH_MAX];
if (*path != '/' && !(path = pathpath(name, NULL, PATH_REGULAR|PATH_EXECUTE, buffer, sizeof(buffer))))
path = name;
execve(path, argv, envv);
if (errno == ENOEXEC)
{
register char** newargv;
register char** ov;
register char** nv;
for (ov = (char**)argv; *ov++;);
if (newargv = newof(0, char*, ov + 1 - (char**)argv, 0))
{
nv = newargv;
*nv++ = "sh";
*nv++ = (char*)path;
ov = (char**)argv;
while (*nv++ = *++ov);
path = pathshell();
execve(path, newargv, envv);
free(newargv);
}
else
errno = ENOMEM;
}
return -1;
}
#endif