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/* Basic system calls */
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "alloc.h"
#include "fail.h"
#include "instruct.h"
#include "mlvalues.h"
#include "signals.h"
#include "stacks.h"
extern int errno;
#ifdef HAS_STRERROR
extern char * strerror();
char * error_message()
{
return strerror(errno);
}
#else
extern int sys_nerr;
extern char * sys_errlist [];
char * error_message()
{
if (errno < 0 || errno >= sys_nerr)
return "unknown error";
else
return sys_errlist[errno];
}
#endif /* HAS_STRERROR */
void sys_error(arg)
char * arg;
{
char * err = error_message();
int err_len = strlen(err);
int arg_len;
value str;
if (arg == NULL) {
str = alloc_string(err_len);
bcopy(err, &Byte(str, 0), err_len);
} else {
arg_len = strlen(arg);
str = alloc_string(arg_len + 2 + err_len);
bcopy(arg, &Byte(str, 0), arg_len);
bcopy(": ", &Byte(str, arg_len), 2);
bcopy(err, &Byte(str, arg_len + 2), err_len);
}
raise_sys_error(str);
}
void sys_exit(retcode) /* ML */
value retcode;
{
exit(Int_val(retcode));
}
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef O_TEXT
#define O_TEXT 0
#endif
static int sys_open_flags[] = {
O_RDONLY, O_WRONLY, O_RDWR, O_APPEND, O_CREAT, O_TRUNC, O_EXCL,
O_BINARY, O_TEXT
};
value sys_open(path, flags, perm) /* ML */
value path, flags, perm;
{
int ret;
ret = open(String_val(path), convert_flag_list(flags, sys_open_flags),
Int_val(perm));
if (ret == -1) sys_error(String_val(path));
return Val_long(ret);
}
value sys_file_exists(name) /* ML */
value name;
{
return Val_bool(access(String_val(name), F_OK) == 0);
}
value sys_remove(name) /* ML */
value name;
{
int ret;
ret = unlink(String_val(name));
if (ret != 0) sys_error(String_val(name));
return Atom(0);
}
value sys_rename(oldname, newname) /* ML */
value oldname, newname;
{
if (rename(String_val(oldname), String_val(newname)) != 0)
sys_error(String_val(oldname));
return Atom(0);
}
value sys_chdir(dirname) /* ML */
value dirname;
{
if (chdir(String_val(dirname)) != 0) sys_error(String_val(dirname));
return Atom(0);
}
value sys_getenv(var) /* ML */
value var;
{
char * res;
res = getenv(String_val(var));
if (res == 0) raise_not_found();
return copy_string(res);
}
static char ** main_argv;
value sys_get_argv(unit) /* ML */
value unit;
{
return copy_string_array(main_argv);
}
void sys_init(argv)
char ** argv;
{
main_argv = argv;
}
value sys_system_command(command) /* ML */
value command;
{
int retcode = system(String_val(command));
if (retcode == -1) sys_error(String_val(command));
return Val_int(retcode);
}
/* Search path function */
char * searchpath(name)
char * name;
{
static char fullname[512];
char * path;
char * p;
char * q;
for (p = name; *p != 0; p++) {
if (*p == '/') return name;
}
path = getenv("PATH");
if (path == 0) return 0;
while(1) {
p = fullname;
while (*path != 0 && *path != ':') {
*p++ = *path++;
}
if (p != fullname) *p++ = '/';
q = name;
while (*q != 0) {
*p++ = *q++;
}
*p = 0;
if (access(fullname, F_OK) == 0) return fullname;
if (*path == 0) return 0;
path++;
}
}
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