*** empty log message ***

master
mark 21 years ago
parent 32162cad79
commit a31cde3b22

@ -0,0 +1,12 @@
CFLAGS = -std=c99 $(WARNINGS) $(DEFINES) $(INCLUDES)
DEFINES = -D_POSIX_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112L -U__STRICT_ANSI__
INCLUDES = -I${LUA}/src
WARNINGS = -W -Wall
LUA = /home/mark/src/lang/lua/lua-5.1-rc2
LUALIBS = -L$(LUA)/lib -llua51
LIBS = spawn.a
ex.dll: ex.o $(LIBS); $(CC) -shared -o $@ ex.o $(LUALIBS) $(LIBS)
spawn.a: spawn.o; $(AR) r $@ $<

@ -0,0 +1,401 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "spawn.h"
#include <sys/wait.h>
/* Generally useful function -- what luaL_checkudata() should do */
static void *luaL_checkuserdata(lua_State *L, int idx, const char *tname)
{
void *ud;
luaL_argcheck(L, ud = luaL_checkudata(L, idx, tname), idx, tname);
return ud;
}
/* -- nil error */
static int posix_error(lua_State *L)
{
lua_pushnil(L);
lua_pushstring(L, strerror(errno));
return 2;
}
/* name -- value/nil */
static int ex_getenv(lua_State *L)
{
const char *nam = luaL_checkstring(L, 1);
char *val = getenv(nam);
if (val)
lua_pushstring(L, val);
else
lua_pushnil(L);
return 1;
}
/* name value -- true/nil error */
static int ex_setenv(lua_State *L)
{
const char *nam = luaL_checkstring(L, 1);
const char *val = luaL_checkstring(L, 2);
if (-1 == setenv(nam, val, 1))
return posix_error(L);
lua_pushboolean(L, 1);
return 1;
}
/* name -- true/nil error */
static int ex_unsetenv(lua_State *L)
{
const char *nam = luaL_checkstring(L, 1);
if (-1 == unsetenv(nam))
return posix_error(L);
lua_pushboolean(L, 1);
return 1;
}
/* -- environment-table */
static int ex_environ(lua_State *L)
{
char **env;
const char *nam, *val, *end;
lua_newtable(L);
for (env = environ; (nam = *env); env++) {
end = strchr(val = strchr(nam, '=') + 1, '\0');
lua_pushlstring(L, nam, val - nam - 1);
lua_pushlstring(L, val, end - val);
lua_settable(L, -3);
}
return 1;
}
/* seconds -- */
static int ex_sleep(lua_State *L)
{
lua_Number seconds = luaL_checknumber(L, 1);
usleep(1e6 * seconds);
return 0;
}
/* pathname -- true/nil error */
static int ex_chdir(lua_State *L)
{
const char *pathname = luaL_checkstring(L, 1);
if (-1 == chdir(pathname))
return posix_error(L);
lua_pushboolean(L, 1);
return 1;
}
/* pathname -- true/nil error */
static int ex_mkdir(lua_State *L)
{
const char *pathname = luaL_checkstring(L, 1);
if (-1 == mkdir(pathname, 0777))
return posix_error(L);
lua_pushboolean(L, 1);
return 1;
}
/* -- pathname/nil error */
static int ex_currentdir(lua_State *L)
{
char pathname[PATH_MAX + 1];
if (!getcwd(pathname, sizeof pathname))
return posix_error(L);
lua_pushstring(L, pathname);
return 1;
}
/* pathname -- iter state nil */
static int ex_dir(lua_State *L) { return luaL_error(L, "not yet implemented"); }
/* pathname/file -- entry */
static int ex_dirent(lua_State *L) { return luaL_error(L, "not yet implemented"); }
static int file_lock(lua_State *L, FILE *f, const char *mode, long offset, long length)
{
struct flock k;
switch (*mode) {
case 'w': k.l_type = F_WRLCK; break;
case 'r': k.l_type = F_RDLCK; break;
case 'u': k.l_type = F_UNLCK; break;
default: return luaL_error(L, "invalid mode");
}
k.l_whence = SEEK_SET;
k.l_start = offset;
k.l_len = length;
if (-1 == fcntl(fileno(f), F_SETLK, &k))
return posix_error(L);
lua_pushboolean(L, 1);
return 1;
}
/* file mode [offset [length]] -- true/nil error */
static int ex_lock(lua_State *L)
{
FILE **pf = luaL_checkuserdata(L, 1, LUA_FILEHANDLE);
const char *mode = luaL_checkstring(L, 2);
long offset = luaL_optnumber(L, 3, 0);
long length = luaL_optnumber(L, 4, 0);
return file_lock(L, *pf, mode, offset, length);
}
/* file [offset [length]] -- true/nil error */
static int ex_unlock(lua_State *L)
{
lua_pushliteral(L, "u");
lua_insert(L, 2);
return ex_lock(L);
}
/* -- LUA_FILEHANDLE file file */
static int make_pipe(lua_State *L, FILE *i, FILE *o)
{
FILE **pf;
luaL_getmetatable(L, LUA_FILEHANDLE);
*(pf = lua_newuserdata(L, sizeof *pf)) = i;
lua_pushvalue(L, -2);
lua_setmetatable(L, -2);
*(pf = lua_newuserdata(L, sizeof *pf)) = o;
lua_pushvalue(L, -2);
lua_setmetatable(L, -2);
return 2;
}
/* -- in out/nil error */
static int ex_pipe(lua_State *L)
{
int fd[2];
if (-1 == pipe(fd))
return posix_error(L);
return make_pipe(L, fdopen(fd[0], "r"), fdopen(fd[1], "w"));
}
/* ... argtab -- ... */
static const char **build_args(lua_State *L)
{
size_t i, n = lua_objlen(L, -1);
const char **argv = lua_newuserdata(L, (n + 2) * sizeof *argv);
/* ... argtab argv */
for (i = 0; i <= n; i++) {
lua_rawgeti(L, -2, i); /* ... argtab argv argi */
argv[i] = lua_tostring(L, -1);
lua_pop(L, 1); /* ... argtab argv */
}
argv[n + 1] = 0;
lua_replace(L, -2); /* ... argv */
return argv;
}
/* ... envtab -- */
static const char **build_env(lua_State *L)
{
size_t i = 0;
luaL_Buffer estr;
luaL_buffinit(L, &estr);
lua_newtable(L); /* ... envtab a */
lua_pushnil(L); /* ... envtab a nil */
for (i = 0; lua_next(L, -3); i++) {/* ... envtab a k v */
luaL_prepbuffer(&estr);
lua_pushvalue(L, -2); /* ... envtab a k v k */
luaL_addvalue(&estr);
luaL_putchar(&estr, '=');
lua_pop(L, 1); /* ... envtab a k v */
luaL_addvalue(&estr);
lua_pop(L, 1); /* ... envtab a k */
luaL_pushresult(&estr); /* ... envtab a k estr */
lua_rawseti(L, -3, i); /* ... envtab a[n]=estr k */
} /* ... envtab a */
lua_replace(L, -2); /* ... a */
return build_args(L); /* ... */
}
static void get_redirect(lua_State *L, posix_spawn_file_actions_t *file_actions,
const char *stream, int descriptor)
{
lua_getfield(L, 2, stream);
if (!lua_isnil(L, -1))
posix_spawn_file_actions_adddup2(file_actions,
fileno(luaL_checkudata(L, -1, LUA_FILEHANDLE)), descriptor);
lua_pop(L, 1);
}
#define PROCESS_HANDLE "process"
struct process {
pid_t pid;
int status;
};
/* filename [args-opts] -- true/nil,error */
/* args-opts -- true/nil,error */
static int ex_spawn(lua_State *L)
{
const char *command;
posix_spawn_file_actions_t file_actions;
const char **argv;
const char **envp;
struct process *p;
int ret;
if (lua_type(L, 1) == LUA_TTABLE) {
lua_getfield(L, 1, "command"); /* opts ... cmd */
if (!lua_isnil(L, -1)) {
/* convert {command=command,arg1,...} to command {arg1,...} */
lua_insert(L, 1); /* cmd opts ... */
}
else {
/* convert {arg0,arg1,...} to arg0 {arg1,...} */
int i, n = lua_objlen(L, 1);
lua_rawgeti(L, 1, 1); /* opts ... nil cmd */
if (lua_isnil(L, -1))
luaL_error(L, "no command specified");
/* XXX check LUA_TSTRING */
lua_insert(L, 1); /* cmd opts ... nil */
for (i = 2; i <= n; i++) {
lua_rawgeti(L, 2, i); /* cmd opts ... nil argi */
lua_rawseti(L, 2, i - 1); /* cmd opts ... nil */
}
lua_rawseti(L, 2, n); /* cmd opts ... */
}
}
/* XXX confusing */
command = luaL_checkstring(L, 1);
/* set defaults */
argv = 0;
envp = (const char **)environ;
posix_spawn_file_actions_init(&file_actions);
/* get arguments, environment, and redirections */
switch (lua_type(L, 2)) {
default: luaL_argerror(L, 2, "expected options table"); break;
case LUA_TNONE: break;
case LUA_TTABLE:
lua_getfield(L, 2, "args"); /* cmd opts ... argtab */
switch (lua_type(L, -1)) {
default: luaL_error(L, "args option must be an array"); break;
case LUA_TNIL:
lua_pop(L, 1); /* cmd opts ... */
lua_pushvalue(L, 2); /* cmd opts ... opts */
if (0) /*FALLTHRU*/
case LUA_TTABLE:
if (lua_objlen(L, 2) > 0)
luaL_error(L, "cannot specify both the args option and array values");
argv = build_args(L); /* cmd opts ... */
if (!argv[0]) argv[0] = command;
}
lua_getfield(L, 2, "env");
switch (lua_type(L, -1)) {
default: luaL_error(L, "env option must be a table"); break;
case LUA_TNIL: break;
case LUA_TTABLE:
envp = build_env(L); /* cmd opts ... */
}
get_redirect(L, &file_actions, "stdin", STDIN_FILENO);
get_redirect(L, &file_actions, "stdout", STDOUT_FILENO);
get_redirect(L, &file_actions, "stderr", STDERR_FILENO);
}
p = lua_newuserdata(L, sizeof *p); /* cmd opts ... proc */
luaL_getmetatable(L, PROCESS_HANDLE); /* cmd opts ... proc M */
lua_setmetatable(L, -2); /* cmd opts ... proc */
p->status = -1;
ret = posix_spawnp(&p->pid, command, &file_actions, 0, (char *const *)argv, (char *const *)envp);
posix_spawn_file_actions_destroy(&file_actions);
if (-1 == ret)
return posix_error(L);
return 1; /* ... proc */
}
/* proc -- exitcode/nil error */
static int process_wait(lua_State *L)
{
struct process *p = luaL_checkudata(L, 1, PROCESS_HANDLE);
if (p->status != -1) {
int status;
waitpid(p->pid, &status, 0);
p->status = WEXITSTATUS(status);
}
lua_pushnumber(L, p->status);
return 1;
}
static const luaL_reg ex_iolib[] = {
{"pipe", ex_pipe},
{0,0}
};
static const luaL_reg ex_iofile_methods[] = {
{"lock", ex_lock},
{"unlock", ex_unlock},
{0,0}
};
static const luaL_reg ex_oslib[] = {
{"getenv", ex_getenv},
{"setenv", ex_setenv},
{"unsetenv", ex_unsetenv},
{"environ", ex_environ},
{"sleep", ex_sleep},
{"chdir", ex_chdir},
{"mkdir", ex_mkdir},
{"currentdir", ex_currentdir},
{"dir", ex_dir},
{"dirent", ex_dirent},
{"spawn", ex_spawn},
{0,0}
};
static const luaL_reg ex_process_methods[] = {
{"wait", process_wait},
{0,0}
};
int luaopen_ex(lua_State *L)
{
/* extend the io table */
lua_getglobal(L, "io");
if (lua_isnil(L, -1)) luaL_error(L, "io not loaded");
luaL_openlib(L, 0, ex_iolib, 0);
/* extend the os table */
lua_getglobal(L, "os");
if (lua_isnil(L, -1)) luaL_error(L, "os not loaded");
luaL_openlib(L, "os", ex_oslib, 0);
/* extend the io.file metatable */
luaL_getmetatable(L, LUA_FILEHANDLE);
if (lua_isnil(L, -1)) luaL_error(L, "can't find FILE* metatable");
luaL_openlib(L, 0, ex_iofile_methods, 0);
/* proc metatable */
luaL_newmetatable(L, PROCESS_HANDLE); /* proc */
luaL_openlib(L, 0, ex_process_methods, 0); /* proc */
lua_pushliteral(L, "__index"); /* proc __index */
lua_pushvalue(L, -2); /* proc __index proc */
lua_settable(L, -3); /* proc */
/* for lack of a better thing to return */
lua_pushboolean(L, 1);
return 1;
}

@ -1,152 +0,0 @@
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <spawn.h>
#include <sys/wait.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
extern char **environ;
/* helper functions */
static void *safe_alloc(lua_State *L, size_t n)
{
return lua_newuserdata(L, n);
}
static int posix_error(lua_State *L)
{
lua_pushnil(L);
lua_pushstring(L, strerror(errno));
return 2;
}
/* seconds -- */
static int osex_sleep(lua_State *L)
{
lua_Number seconds = luaL_checknumber(L, 1);
usleep(1e6 * seconds);
return 0;
}
#define PROCESS_HANDLE "process"
struct process {
pid_t pid;
int status;
};
static void get_redirect(lua_State *L, posix_spawn_file_actions_t *file_actions,
const char *stream, int descriptor)
{
lua_getfield(L, 2, stream);
if (!lua_isnil(L, -1))
posix_spawn_file_actions_adddup2(file_actions,
fileno(luaL_checkudata(L, -1, LUA_FILEHANDLE)), descriptor);
lua_pop(L, 1);
}
/* filename [options] -- true/nil,error */
static int osex_spawn(lua_State *L)
{
const char *filename = luaL_checkstring(L, 1);
posix_spawn_file_actions_t file_actions;
char **argv;
char **envp;
struct process *p;
if (lua_type(L, 2) == LUA_TTABLE) {
lua_getfield(L, 2, "args");
if (!lua_isnil(L, -1)) {
luaL_checktype(L, -1, LUA_TTABLE);
/* XXX */
}
else {
argv = safe_alloc(L, 1 * sizeof *argv);
argv[0] = 0;
}
lua_pop(L, 1);
lua_getfield(L, 2, "env");
if (!lua_isnil(L, -1)) {
size_t i, n;
luaL_checktype(L, -1, LUA_TTABLE);
n = lua_objlen(L, -1);
envp = safe_alloc(L, (n + 1) * sizeof *envp);
for (i = 1; i <= n; i++) {
lua_rawgeti(L, -1, i);
luaL_checktype(L, -1, LUA_TSTRING);
/* XXX push onto zz */
}
}
else {
envp = environ;
}
lua_pop(L, 1);
get_redirect(L, &file_actions, "stdin", STDIN_FILENO);
get_redirect(L, &file_actions, "stdout", STDOUT_FILENO);
get_redirect(L, &file_actions, "stderr", STDERR_FILENO);
}
p = lua_newuserdata(L, sizeof *p);
luaL_getmetatable(L, PROCESS_HANDLE);
lua_setmetatable(L, -2);
p->status = -1;
if (0 != posix_spawnp(&p->pid, filename, &file_actions, 0, argv, envp))
return posix_error(L);
return 1;
}
static int process_wait(lua_State *L)
{
struct process *p = luaL_checkudata(L, 1, PROCESS_HANDLE);
if (p->status != -1) {
int status;
waitpid(p->pid, &status, 0);
p->status = WEXITSTATUS(status);
}
lua_pushnumber(L, p->status);
return 1;
}
static const luaL_reg process_lib[] = {
{"wait", process_wait},
{0,0}
};
static int osex_newpipe(lua_State *L)
{
int fd[2];
FILE **pf;
if (0 != pipe(fd))
return posix_error(L);
luaL_getmetatable(L, LUA_FILEHANDLE);
pf = lua_newuserdata(L, sizeof *pf);
lua_pushvalue(L, -2);
lua_setmetatable(L, -2);
*pf = fdopen(fd[0], "r");
pf = lua_newuserdata(L, sizeof *pf);
lua_pushvalue(L, -2);
lua_setmetatable(L, -2);
*pf = fdopen(fd[1], "w");
return 2;
}
static const luaL_reg osex_lib[] = {
{"sleep", osex_sleep},
{"spawn", osex_spawn},
{"newpipe", osex_newpipe},
{0,0}
};
int luaopen_osex(lua_State *L)
{
luaL_newmetatable(L, PROCESS_HANDLE);
luaL_register(L, 0, process_lib);
luaL_register(L, "os", osex_lib);
return 1;
}

@ -0,0 +1,66 @@
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <sys/types.h>
#include "spawn.h"
#define nelemof(A) (sizeof A / sizeof *A)
struct posix_spawn_file_actions {
int dups[3];
};
int posix_spawn_file_actions_init(posix_spawn_file_actions_t *act)
{
act->dups[0] = act->dups[1] = act->dups[2] = -1;
return 0;
}
int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *act, int d, int n)
{
if (d < 0 || OPEN_MAX < d || n < 0 || OPEN_MAX < n) {
errno = EBADF;
return -1;
}
if (2 < d) {
errno = EINVAL;
return -1;
}
act->dups[d] = n;
return 0;
}
int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *act)
{
return 0;
}
int posix_spawnp(pid_t *restrict ppid,
const char *restrict path,
const posix_spawn_file_actions_t *act,
const posix_spawnattr_t *restrict attrp,
char *const argv[restrict],
char *const envp[restrict])
{
if (!ppid || !path || !argv || !envp)
return EINVAL;
if (attrp)
return EINVAL;
/* check act actions? */
switch (*ppid = fork()) {
case -1: return -1;
default: return 0;
case 0:
if (act)
for (size_t i = 0; i < nelemof(act->dups); i++)
if (act->dups[i] > -1)
dup2(i, act->dups[i]);
environ = (char **)envp;
execvp(path, argv);
_exit(EXIT_FAILURE);
/*NOTREACHED*/
}
}

@ -0,0 +1,40 @@
#include <sched.h>
#include <signal.h>
#include <sys/types.h>
typedef struct posix_spawnattr posix_spawnattr_t;
enum {
POSIX_SPAWN_RESETIDS,
POSIX_SPAWN_SETPGROUP,
POSIX_SPAWN_SETSCHEDPARAM,
POSIX_SPAWN_SETSCHEDULER,
POSIX_SPAWN_SETSIGDEF,
POSIX_SPAWN_SETSIGMASK,
};
int posix_spawnattr_init(posix_spawnattr_t *attrp);
int posix_spawnattr_getflags(const posix_spawnattr_t *restrict attrp, short *restrict flags);
int posix_spawnattr_setflags(posix_spawnattr_t *attrp, short flags);
int posix_spawnattr_getpgroup(const posix_spawnattr_t *restrict attrp, pid_t *restrict pgroup);
int posix_spawnattr_setpgroup(posix_spawnattr_t *attrp, pid_t pgroup);
int posix_spawnattr_getschedparam(const posix_spawnattr_t *restrict attrp, struct sched_param *restrict schedparam);
int posix_spawnattr_setschedparam(posix_spawnattr_t *restrict attrp, const struct sched_param *restrict schedparam);
int posix_spawnattr_getschedpolicy(const posix_spawnattr_t *restrict attrp, int *restrict schedpolicy);
int posix_spawnattr_setschedpolicy(posix_spawnattr_t *attrp, int schedpolicy);
int posix_spawnattr_getsigdefault(const posix_spawnattr_t *restrict attrp, sigset_t *restrict sigdefault);
int posix_spawnattr_setsigdefault(posix_spawnattr_t *restrict attrp, const sigset_t *restrict sigdefault);
int posix_spawnattr_getsigmask(const posix_spawnattr_t *restrict attrp, sigset_t *restrict sigmask);
int posix_spawnattr_setsigmask(posix_spawnattr_t *restrict attrp, const sigset_t *restrict sigmask);
int posix_spawnattr_destroy(posix_spawnattr_t *attrp);
typedef struct posix_spawn_file_actions posix_spawn_file_actions_t;
int posix_spawn_file_actions_init(posix_spawn_file_actions_t *file_actions);
int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions, int filedes, int newfiledes);
int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions, int filedes);
int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *restrict file_actions, int filedes, const char *restrict path, int oflag, mode_t mode);
int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions);
int posix_spawn(pid_t *restrict, const char *restrict, const posix_spawn_file_actions_t *, const posix_spawnattr_t *restrict, char *const argv[restrict], char *const envp[restrict]);
int posix_spawnp(pid_t *restrict, const char *restrict, const posix_spawn_file_actions_t *, const posix_spawnattr_t *restrict, char *const argv[restrict], char *const envp[restrict]);
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