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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* 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 "sfhdr.h"
/* Create a coprocess.
** Written by Kiem-Phong Vo.
*/
#if _PACKAGE_ast
#include <proc.h>
#else
#define EXIT_NOTFOUND 127
#define READ 0
#define WRITE 1
#ifndef CHAR_BIT
#define CHAR_BIT 8
#endif
static char Meta[1<<CHAR_BIT], **Path;
/* execute command directly if possible; else use the shell */
#if __STD_C
static void execute(const char* argcmd)
#else
static void execute(argcmd)
char* argcmd;
#endif
{
reg char *s, *cmd, **argv, **p, *interp;
reg int n;
/* define interpreter */
if(!(interp = getenv("SHELL")) || !interp[0])
interp = "/bin/sh";
if(strcmp(interp,"/bin/sh") != 0 && strcmp(interp,"/bin/ksh") != 0 )
{ if(access(interp,X_OK) == 0)
goto do_interp;
else interp = "/bin/sh";
}
/* if there is a meta character, let the shell do it */
for(s = (char*)argcmd; *s; ++s)
if(Meta[(uchar)s[0]])
goto do_interp;
/* try to construct argv */
if(!(cmd = (char*)malloc(strlen(argcmd)+1)) )
goto do_interp;
strcpy(cmd,argcmd);
if(!(argv = (char**)malloc(16*sizeof(char*))) )
goto do_interp;
for(n = 0, s = cmd;; )
{ while(isspace(s[0]))
s += 1;
if(s[0] == 0)
break;
/* new argument */
argv[n++] = s;
if((n%16) == 0 && !(argv = (char**)realloc(argv,(n+16)*sizeof(char*))) )
goto do_interp;
/* make this into a C string */
while(s[0] && !isspace(s[0]))
s += 1;
if(!s[0])
*s++ = 0;
}
if(n == 0)
goto do_interp;
argv[n] = NIL(char*);
/* get the command name */
cmd = argv[0];
for(s = cmd+strlen(cmd)-1; s >= cmd; --s)
if(*s == '/')
break;
argv[0] = s+1;
/* Non-standard pathnames as in nDFS should be handled by the shell */
for(s = cmd+strlen(cmd)-1; s >= cmd+2; --s)
if(s[0] == '.' && s[-1] == '.' && s[-2] == '.')
goto do_interp;
if(cmd[0] == '/' ||
(cmd[0] == '.' && cmd[1] == '/') ||
(cmd[0] == '.' && cmd[1] == '.' && cmd[2] == '/') )
{ if(access(cmd,X_OK) != 0)
goto do_interp;
else execv(cmd,argv);
}
else
{ for(p = Path; *p; ++p)
{ s = sfprints("%s/%s", *p, cmd);
if(access(s,X_OK) == 0)
execv(s,argv);
}
}
/* if get here, let the interpreter do it */
do_interp:
for(s = interp+strlen(interp)-1; s >= interp; --s)
if(*s == '/')
break;
execl(interp, s+1, "-c", argcmd, NIL(char*));
_exit(EXIT_NOTFOUND);
}
#endif /*_PACKAGE_ast*/
#if __STD_C
Sfio_t* sfpopen(Sfio_t* f, const char* command, const char* mode)
#else
Sfio_t* sfpopen(f,command,mode)
Sfio_t* f;
char* command; /* command to execute */
char* mode; /* mode of the stream */
#endif
{
#if _PACKAGE_ast
reg Proc_t* proc;
reg int sflags;
reg long flags;
reg int pflags;
char* av[4];
if (!command || !command[0] || !mode)
return 0;
sflags = _sftype(mode, NiL, NiL);
if(f == (Sfio_t*)(-1))
{ /* stdio compatibility mode */
f = NIL(Sfio_t*);
pflags = 1;
}
else pflags = 0;
flags = 0;
if (sflags & SF_READ)
flags |= PROC_READ;
if (sflags & SF_WRITE)
flags |= PROC_WRITE;
av[0] = "sh";
av[1] = "-c";
av[2] = (char*)command;
av[3] = 0;
if (!(proc = procopen(0, av, 0, 0, flags)))
return 0;
if (!(f = sfnew(f, NIL(Void_t*), (size_t)SF_UNBOUND,
(sflags&SF_READ) ? proc->rfd : proc->wfd, sflags|((sflags&SF_RDWR)?0:SF_READ))) ||
_sfpopen(f, (sflags&SF_READ) ? proc->wfd : -1, proc->pid, pflags) < 0)
{
if (f) sfclose(f);
procclose(proc);
return 0;
}
procfree(proc);
return f;
#else
reg int pid, fd, pkeep, ckeep, sflags;
int stdio, parent[2], child[2];
Sfio_t sf;
/* set shell meta characters */
if(Meta[0] == 0)
{ reg char* s;
Meta[0] = 1;
for(s = "!@#$%&*(){}[]:;<>~`'|\"\\"; *s; ++s)
Meta[(uchar)s[0]] = 1;
}
if(!Path)
Path = _sfgetpath("PATH");
/* sanity check */
if(!command || !command[0] || !mode)
return NIL(Sfio_t*);
sflags = _sftype(mode,NIL(int*),NIL(int*));
/* make pipes */
parent[0] = parent[1] = child[0] = child[1] = -1;
if(sflags&SF_RDWR)
{ if(syspipef(parent) < 0)
goto error;
if((sflags&SF_RDWR) == SF_RDWR && syspipef(child) < 0)
goto error;
}
switch((pid = fork()) )
{
default : /* in parent process */
if(sflags&SF_READ)
{ pkeep = READ; ckeep = WRITE; }
else { pkeep = WRITE; ckeep = READ; }
if(f == (Sfio_t*)(-1))
{ /* stdio compatibility mode */
f = NIL(Sfio_t*);
stdio = 1;
}
else stdio = 0;
/* make the streams */
if(!(f = sfnew(f,NIL(Void_t*),(size_t)SF_UNBOUND,parent[pkeep],sflags|((sflags&SF_RDWR)?0:SF_READ))))
goto error;
if(sflags&SF_RDWR)
{ CLOSE(parent[!pkeep]);
SETCLOEXEC(parent[pkeep]);
if((sflags&SF_RDWR) == SF_RDWR)
{ CLOSE(child[!ckeep]);
SETCLOEXEC(child[ckeep]);
}
}
/* save process info */
fd = (sflags&SF_RDWR) == SF_RDWR ? child[ckeep] : -1;
if(_sfpopen(f,fd,pid,stdio) < 0)
{ (void)sfclose(f);
goto error;
}
return f;
case 0 : /* in child process */
/* determine what to keep */
if(sflags&SF_READ)
{ pkeep = WRITE; ckeep = READ; }
else { pkeep = READ; ckeep = WRITE; }
/* zap fd that we don't need */
if(sflags&SF_RDWR)
{ CLOSE(parent[!pkeep]);
if((sflags&SF_RDWR) == SF_RDWR)
CLOSE(child[!ckeep]);
}
/* use sfsetfd to make these descriptors the std-ones */
SFCLEAR(&sf,NIL(Vtmutex_t*));
/* must be careful so not to close something useful */
if((sflags&SF_RDWR) == SF_RDWR && pkeep == child[ckeep])
if((child[ckeep] = sysdupf(pkeep)) < 0)
_exit(EXIT_NOTFOUND);
if(sflags&SF_RDWR)
{ if (parent[pkeep] != pkeep)
{ sf.file = parent[pkeep];
CLOSE(pkeep);
if(sfsetfd(&sf,pkeep) != pkeep)
_exit(EXIT_NOTFOUND);
}
if((sflags&SF_RDWR) == SF_RDWR && child[ckeep] != ckeep)
{ sf.file = child[ckeep];
CLOSE(ckeep);
if(sfsetfd(&sf,ckeep) != ckeep)
_exit(EXIT_NOTFOUND);
}
}
execute(command);
return NIL(Sfio_t*);
case -1 : /* error */
error:
if(parent[0] >= 0)
{ CLOSE(parent[0]); CLOSE(parent[1]); }
if(child[0] >= 0)
{ CLOSE(child[0]); CLOSE(child[1]); }
return NIL(Sfio_t*);
}
#endif /*_PACKAGE_ast*/
}
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