/usr/bin/realcsh.c is in binfmtc 0.17-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | /*BINFMTC: -lreadline -I/usr/include/readline
exit 1
* binfmt_misc C Interpreter
* Copyright (C) 2005-2006 Junichi Uekawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* test program: Real C shell implemented in binfmtc.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <readline.h>
#include <history.h>
typedef struct defs_list
{
struct defs_list* next;
char* s;
} * defsp;
defsp add_string(defsp orig, const char* newstr)
{
defsp t = malloc(sizeof(struct defs_list));
t->next=orig;
t->s=strdup(newstr);
return t;
}
int main(int argc, char** argv)
{
char * str = NULL;
char * tempfilename = NULL;
FILE * f;
int fd;
defsp t, defs=NULL;
defsp header=NULL;
int i;
for (i=1; i < argc; ++i)
header=add_string(header, argv[i]);
defs=add_string(defs, "#include <stdlib.h>");
defs=add_string(defs, "#include <unistd.h>");
defs=add_string(defs, "#include <stdio.h>");
while (NULL!=(str = readline("REAL csh: ")))
{
if (*str=='\0') /* ignore blanks. */
{
free(str);
continue;
}
add_history(str);
if (*str=='#')
{
/* ## debug symbol to dump header file list. */
if (*(str+1)=='#')
{
printf("defs:\n");
for (t=defs; t; t=t->next)
{
printf(" %s\n", t->s);
}
printf("header:\n");
for (t=header; t; t=t->next)
{
printf(" %s\n", t->s);
}
free(str);
continue;
}
defs=add_string(defs, str);
free(str);
continue;
}
asprintf(&tempfilename, "%s/realcshXXXXXX",
getenv("BINFMTCTMPDIR")?:
getenv("TMPDIR")?:
getenv("TEMPDIR")?:
"/tmp"
);
f = fdopen(fd=mkstemp(tempfilename), "w");
fchmod(fd, 0700);
fprintf(f,
"/*BINFMTC:");
for (t=header; t; t=t->next)
{
fprintf(f," %s", t->s);
}
fprintf(f,
"\n*/\n");
for (t=defs; t; t=t->next)
{
fprintf(f, "%s\n", t->s);
}
fprintf(f,
"int main(int argc, char ** argv)\n"
"{\n"
"%s;\n"
"return 0; \n"
"}\n",
str);
fclose (f);
system (tempfilename);
unlink (tempfilename);
free (str);
}
printf ("\n");
return 0;
}
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