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elk/lib/unix/process.c

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/* process.c
*
* $Id$
*
* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
* Copyright 2002, 2003 Sam Hocevar <sam@hocevar.net>, Paris
*
* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
* between TELES and Nixdorf Microprocessor Engineering, Berlin).
*
* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
* owners or individual owners of copyright in this software, grant to any
* person or company a worldwide, royalty free, license to
*
* i) copy this software,
* ii) prepare derivative works based on this software,
* iii) distribute copies of this software or derivative works,
* iv) perform this software, or
* v) display this software,
*
* provided that this notice is not removed and that neither Oliver Laumann
* nor Teles nor Nixdorf are deemed to have made any representations as to
* the suitability of this software for any purpose nor are held responsible
* for any defects of this software.
*
* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
*/
#include "unix.h"
#include <string.h>
#include <stdio.h>
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif
#ifndef WIN32
#if defined(__APPLE__)
# include <crt_externs.h>
# define environ (* _NSGetEnviron())
#elif defined(__ENVIRON_IN_UNISTD_H)
# define environ __environ
#elif defined(ENVIRON_IN_UNISTD_H)
/* Nothing to do */
#else
/* "extern" in front of the next declaration causes the Ultrix 4.2 linker
* to fail, but omitting it no longer works with modern C compilers: */
extern char **environ;
#endif
#if defined(HAVE_ENVIRON)
static Object P_Environ() {
Object ret, cell, str;
char *p, **ep;
static char c[2];
GC_Node2;
cell = ret = Null;
GC_Link2(ret, cell);
for (ep = environ; *ep; ep++) {
cell = Cons(Null, Null);
p = strchr(*ep, '=');
if (p)
*p++ = 0;
else p = c+1;
str = Make_String(p, strlen(p));
Cdr(cell) = str;
str = Make_String(*ep, strlen(*ep));
Car(cell) = str;
ret = Cons(cell, ret);
*--p = '=';
}
GC_Unlink;
return P_Reverse(ret);
}
#endif
static Object General_Exec(int argc, Object *argv, int path) {
Object fn, args, p, e;
char *fnp, **argp, **envp;
int i, len;
Alloca_Begin;
fn = argv[0], args = argv[1];
fnp = Get_Strsym(fn);
Check_List(args);
len = Fast_Length(args);
Alloca(argp, char**, (len+1) * sizeof(char*));
for (i = 0, p = args; i < len; i++, p = Cdr(p)) {
e = Car(p);
Get_String_Stack(e, argp[i]);
}
argp[i] = 0;
if (argc == 3) {
args = argv[2];
Check_List(args);
len = Fast_Length(args);
Alloca(envp, char**, (len+1) * sizeof(char*));
for (i = 0, p = args; i < len; i++, p = Cdr(p)) {
struct S_String *s1, *s2;
e = Car(p);
Check_Type(e, T_Pair);
Check_Type(Car(e), T_String);
Check_Type(Cdr(e), T_String);
s1 = STRING(Car(e));
s2 = STRING(Cdr(e));
Alloca(envp[i], char*, s1->size + 1 + s2->size + 1);
sprintf(envp[i], "%.*s=%.*s", s1->size, s1->data,
s2->size, s2->data);
}
envp[i] = 0;
Exit_Handler();
#if 0
if (path)
(void)execvpe(fnp, argp, envp); /* ... doesn't exist */
else
#endif
(void)execve(fnp, argp, envp);
} else {
Exit_Handler();
if (path)
(void)execvp(fnp, argp);
else
(void)execv(fnp, argp);
}
Alloca_End;
Raise_System_Error1("~s: ~E", fn);
}
static Object P_Exec(int argc, Object *argv) {
return General_Exec(argc, argv, 0);
}
static Object P_Exec_Path(int argc, Object *argv) {
if (argc == 3) /* There is no execvpe (yet?). */
Primitive_Error("environment argument not supported");
return General_Exec(argc, argv, 1);
}
static Object P_Fork() {
int pid;
switch (pid = fork()) {
case -1:
Raise_System_Error("~E");
case 0:
Call_Onfork();
}
return Make_Integer(pid);
}
static Object P_Getenv(Object e) {
extern char *getenv();
char *s;
return (s = getenv(Get_String(e))) ? Make_String(s, strlen(s)) : False;
}
static Object P_Getlogin() {
extern char *getlogin();
char *s;
Disable_Interrupts;
s = getlogin();
Enable_Interrupts;
if (s == 0)
Raise_Error("cannot get login name");
return Make_String(s, strlen(s));
}
static Object P_Getgids() { return Integer_Pair(getgid(), getegid()); }
static Object P_Getpids() { return Integer_Pair(getpid(), getppid()); }
static Object P_Getuids() { return Integer_Pair(getuid(), geteuid()); }
static Object P_Getgroups() {
int i, n;
GETGROUPS_TYPE *p;
Object ret, next;
Alloca_Begin;
GC_Node2;
/* gcc may complain under SunOS 4.x, because the prototype says
* that the type of the 2nd argument is unsigned short*, not int.
* But int is right.
*/
if ((n = getgroups(0, (GETGROUPS_TYPE *)0)) == -1)
#ifdef NGROUPS
n = NGROUPS; /* 4.3BSD */
#else
Raise_System_Error("~E");
#endif
Alloca(p, GETGROUPS_TYPE*, n*sizeof(GETGROUPS_TYPE));
(void)getgroups(n, p);
next = ret = P_Make_List(Make_Integer(n), Null);
GC_Link2(ret, next);
for (i = 0; i < n; i++, next = Cdr(next)) {
Object x;
x = Make_Unsigned((unsigned)p[i]);
Car(next) = x;
}
GC_Unlink;
Alloca_End;
return ret;
}
static Object P_Nice(Object incr) {
int ret;
errno = 0;
if ((ret = nice(Get_Integer(incr))) == -1 && errno != 0)
Raise_System_Error("~E");
return Make_Integer(ret);
}
static Object Open_Pipe(Object cmd, int flags) {
FILE *fp;
Object ret;
Disable_Interrupts;
if ((fp = popen(Get_String(cmd), flags == P_INPUT ? "r" : "w")) == 0) {
Enable_Interrupts;
Raise_Error("cannot open pipe to process");
}
ret = Make_Port(flags, fp, Make_String("pipe-port", 9));
PORT(ret)->closefun = pclose;
Register_Object(ret, (GENERIC)0, Terminate_File, 0);
Enable_Interrupts;
return ret;
}
static Object P_Open_Input_Pipe(Object cmd) {
return Open_Pipe(cmd, P_INPUT);
}
static Object P_Open_Output_Pipe(Object cmd) {
return Open_Pipe(cmd, 0);
}
static Object P_Process_Resources(Object ret1, Object ret2) {
static int hzval;
struct tms tms;
Object x;
GC_Node2;
if (hzval == 0) {
#ifdef HZ
hzval = HZ;
#else
#ifdef CLK_TCK
hzval = CLK_TCK;
#else
#ifdef _SC_CLK_TCK
hzval = (int)sysconf(_SC_CLK_TCK);
#else
hzval = 60; /* Fallback for 4.3BSD. I don't have a better idea. */
#endif
#endif
#endif
}
Check_Result_Vector(ret1, 2);
Check_Result_Vector(ret2, 2);
(void)times(&tms);
GC_Link2(ret1, ret2);
x = Make_Unsigned_Long((unsigned long)tms.tms_utime);
VECTOR(ret1)->data[0] = x;
x = Make_Unsigned_Long((unsigned long)tms.tms_stime);
VECTOR(ret1)->data[1] = x;
x = Make_Unsigned_Long((unsigned long)tms.tms_cutime);
VECTOR(ret2)->data[0] = x;
x = Make_Unsigned_Long((unsigned long)tms.tms_cstime);
VECTOR(ret2)->data[1] = x;
GC_Unlink;
return Make_Integer(hzval);
}
static Object P_Sleep(Object s) {
(void)sleep(Get_Unsigned(s));
return Void;
}
static Object P_System(Object cmd) {
int n, pid, status;
char *s = Get_String(cmd);
#ifdef HAVE_VFORK
switch (pid = vfork()) {
#else
switch (pid = fork()) {
#endif
case -1:
Raise_System_Error("fork: ~E");
case 0:
for (n = Num_Filedescriptors(); n >= 3; n--)
(void)close(n);
execl("/bin/sh", "sh", "-c", s, (char *)0);
_exit(127);
default:
Disable_Interrupts;
while ((n = wait(&status)) != pid && n != -1)
;
Enable_Interrupts;
}
/* Can this happen?
if (n == -1)
return False;
*/
n = status & 0377;
if (n)
return Cons(Make_Integer(n), Null);
return Make_Integer((status >> 8) & 0377);
}
static Object P_Umask(Object mask) {
return Make_Integer(umask(Get_Integer(mask)));
}
static Object P_Working_Directory() {
char *buf;
int max = Path_Max()+2; /* getcwd() needs two extra bytes */
Object ret;
#if !defined(HAVE_GETCWD) && !defined(HAVE_GETWD)
FILE *fp;
char *p;
#endif
Alloca_Begin;
Alloca(buf, char*, max);
Disable_Interrupts;
#ifdef HAVE_GETCWD
if (getcwd(buf, max) == 0) {
Saved_Errno = errno;
Alloca_End;
Enable_Interrupts;
Raise_System_Error("~E");
}
#else
#ifdef HAVE_GETWD
if (getwd(buf) == 0) {
Alloca_End;
Enable_Interrupts;
Raise_Error(buf);
}
#else
if ((fp = popen("pwd", "r")) == 0) {
err:
Alloca_End;
Enable_Interrupts;
Raise_Error("cannot get output from pwd");
}
if (fgets(buf, max, fp) == 0)
goto err;
if (p = strchr(buf, '\n')) *p = '\0';
(void)pclose(fp);
#endif
#endif
Enable_Interrupts;
ret = Make_String(buf, strlen(buf));
Alloca_End;
return ret;
}
void elk_init_unix_process() {
#if defined(HAVE_ENVIRON)
Def_Prim(P_Environ, "unix-environ", 0, 0, EVAL);
#endif
Def_Prim(P_Exec, "unix-exec", 2, 3, VARARGS);
Def_Prim(P_Exec_Path, "unix-exec-path", 2, 3, VARARGS);
Def_Prim(P_Fork, "unix-fork", 0, 0, EVAL);
Def_Prim(P_Getenv, "unix-getenv", 1, 1, EVAL);
Def_Prim(P_Getlogin, "unix-getlogin", 0, 0, EVAL);
Def_Prim(P_Getgids, "unix-getgids", 0, 0, EVAL);
Def_Prim(P_Getpids, "unix-getpids", 0, 0, EVAL);
Def_Prim(P_Getuids, "unix-getuids", 0, 0, EVAL);
Def_Prim(P_Getgroups, "unix-getgroups", 0, 0, EVAL);
Def_Prim(P_Nice, "unix-nice", 1, 1, EVAL);
Def_Prim(P_Open_Input_Pipe, "unix-open-input-pipe", 1, 1, EVAL);
Def_Prim(P_Open_Output_Pipe, "unix-open-output-pipe", 1, 1, EVAL);
Def_Prim(P_Process_Resources, "unix-process-resources-vector-fill!",
2, 2, EVAL);
Def_Prim(P_Sleep, "unix-sleep", 1, 1, EVAL);
Def_Prim(P_System, "unix-system", 1, 1, EVAL);
Def_Prim(P_Umask, "unix-umask", 1, 1, EVAL);
Def_Prim(P_Working_Directory, "unix-working-directory", 0, 0, EVAL);
}
#endif
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