ref: a79465e118a0469bbda928f86b9eef6b42d18593
dir: /sys/src/cmd/rc/unix.c/
/*
* Unix versions of system-specific functions
* By convention, exported routines herein have names beginning with an
* upper case letter.
*/
#include "rc.h"
#include "exec.h"
#include "io.h"
#include "fns.h"
#include "getflags.h"
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/wait.h>
static void execfinit(void);
builtin Builtin[] = {
"cd", execcd,
"whatis", execwhatis,
"eval", execeval,
"exec", execexec, /* but with popword first */
"exit", execexit,
"shift", execshift,
"wait", execwait,
".", execdot,
"flag", execflag,
"finit", execfinit,
0
};
char Rcmain[] = PREFIX "/lib/rcmain";
char Fdprefix[] = "/dev/fd/";
char *Signame[NSIG];
#define SEP '\1'
extern char **environ;
static char **envp;
static void
Xrdfn(void)
{
char *s;
int len;
for(;*envp;envp++){
for(s=*envp;*s && *s!='(' && *s!='=';s++);
switch(*s){
case '(': /* Bourne again */
if(strncmp(s, "()fn ", 5)!=0)
continue;
s=estrdup(s+2);
len=strlen(s);
s[len++]='\n';
envp++;
runq->pc--; /* re-execute */
execcmds(openiocore(s, len), estrdup("*environ*"), runq->local, runq->redir);
runq->lex->qflag = 1;
return;
default:
continue;
}
}
}
static void
execfinit(void)
{
static union code rdfns[5];
if(rdfns[0].i==0){
rdfns[0].i = 1;
rdfns[1].s = "*rdfns*";
rdfns[2].f = Xrdfn;
rdfns[3].f = Xreturn;
rdfns[4].f = 0;
}
poplist();
envp=environ;
start(rdfns, 2, runq->local, runq->redir);
}
static int
cmpenv(const void *aa, const void *ab)
{
return strcmp(*(char**)aa, *(char**)ab);
}
static char**
mkenv(void)
{
char **env, **ep, *p, *q;
struct var **h, *v;
struct word *a;
int nvar = 0, nchr = 0, sep;
/*
* Slightly kludgy loops look at locals then globals.
* locals no longer exist - geoff
*/
for(h = gvar-1; h != &gvar[NVAR]; h++)
for(v = h >= gvar? *h: runq->local; v ;v = v->next){
if((v==vlook(v->name)) && v->val){
nvar++;
nchr+=strlen(v->name)+1;
for(a = v->val;a;a = a->next)
nchr+=strlen(a->word)+1;
}
if(v->fn){
nvar++;
nchr+=strlen(v->name)+strlen(v->fn[v->pc-1].s)+8;
}
}
env = (char **)emalloc((nvar+1)*sizeof(char *)+nchr);
ep = env;
p = (char *)&env[nvar+1];
for(h = gvar-1; h != &gvar[NVAR]; h++)
for(v = h >= gvar? *h: runq->local;v;v = v->next){
if((v==vlook(v->name)) && v->val){
*ep++=p;
q = v->name;
while(*q) *p++=*q++;
sep='=';
for(a = v->val;a;a = a->next){
*p++=sep;
sep = SEP;
q = a->word;
while(*q) *p++=*q++;
}
*p++='\0';
}
if(v->fn){
*ep++=p;
*p++='#'; *p++='('; *p++=')'; /* to fool Bourne */
*p++='f'; *p++='n'; *p++=' ';
q = v->name;
while(*q) *p++=*q++;
*p++=' ';
q = v->fn[v->pc-1].s;
while(*q) *p++=*q++;
*p++='\0';
}
}
*ep = 0;
qsort((void *)env, nvar, sizeof ep[0], cmpenv);
return env;
}
static word*
envval(char *s)
{
char *t, c;
word *v;
for(t=s;*t&&*t!=SEP;t++);
c=*t;
*t='\0';
v=newword(s, c=='\0'?(word*)0:envval(t+1));
*t=c;
return v;
}
void
Vinit(void)
{
char *s;
for(envp=environ;*envp;envp++){
for(s=*envp;*s && *s!='(' && *s!='=';s++);
switch(*s){
case '=':
*s='\0';
setvar(*envp, envval(s+1));
*s='=';
break;
default: continue;
}
}
}
static void
sighandler(int sig)
{
trap[sig]++;
ntrap++;
}
void
Trapinit(void)
{
int i;
Signame[0] = "sigexit";
#ifdef SIGINT
Signame[SIGINT] = "sigint";
#endif
#ifdef SIGTERM
Signame[SIGTERM] = "sigterm";
#endif
#ifdef SIGHUP
Signame[SIGHUP] = "sighup";
#endif
#ifdef SIGQUIT
Signame[SIGQUIT] = "sigquit";
#endif
#ifdef SIGPIPE
Signame[SIGPIPE] = "sigpipe";
#endif
#ifdef SIGUSR1
Signame[SIGUSR1] = "sigusr1";
#endif
#ifdef SIGUSR2
Signame[SIGUSR2] = "sigusr2";
#endif
#ifdef SIGBUS
Signame[SIGBUS] = "sigbus";
#endif
#ifdef SIGWINCH
Signame[SIGWINCH] = "sigwinch";
#endif
for(i=1; i<NSIG; i++) if(Signame[i]){
#ifdef SA_RESTART
struct sigaction a;
sigaction(i, NULL, &a);
a.sa_flags &= ~SA_RESTART;
a.sa_handler = sighandler;
sigaction(i, &a, NULL);
#else
signal(i, sighandler);
#endif
}
}
char*
Errstr(void)
{
return strerror(errno);
}
int
Waitfor(int pid)
{
thread *p;
char num[12];
int wpid, status;
if(pid >= 0 && !havewaitpid(pid))
return 0;
while((wpid = wait(&status))!=-1){
delwaitpid(wpid);
inttoascii(num, WIFSIGNALED(status)?WTERMSIG(status)+1000:WEXITSTATUS(status));
if(wpid==pid){
setstatus(num);
return 0;
}
for(p = runq->ret;p;p = p->ret)
if(p->pid==wpid){
p->pid=-1;
p->status = estrdup(num);
break;
}
}
if(Eintr()) return -1;
return 0;
}
static char **nextenv;
void
Updenv(void)
{
if(nextenv){
free(nextenv);
nextenv = NULL;
}
if(err)
flushio(err);
}
void
Exec(char **argv)
{
if(nextenv==NULL) nextenv=mkenv();
execve(argv[0], argv+1, nextenv);
}
int
Fork(void)
{
Updenv();
return fork();
}
void*
Opendir(char *name)
{
return opendir(name);
}
char*
Readdir(void *arg, int onlydirs)
{
DIR *rd = arg;
struct dirent *ent = readdir(rd);
if(ent == NULL)
return 0;
return ent->d_name;
}
void
Closedir(void *arg)
{
DIR *rd = arg;
closedir(rd);
}
long
Write(int fd, void *buf, long cnt)
{
return write(fd, buf, cnt);
}
long
Read(int fd, void *buf, long cnt)
{
return read(fd, buf, cnt);
}
long
Seek(int fd, long cnt, long whence)
{
return lseek(fd, cnt, whence);
}
int
Executable(char *file)
{
return access(file, 01)==0;
}
int
Open(char *file, int mode)
{
static int tab[] = {O_RDONLY,O_WRONLY,O_RDWR,O_RDONLY};
int fd = open(file, tab[mode&3]);
if(fd >= 0 && mode == 3)
unlink(file);
return fd;
}
void
Close(int fd)
{
close(fd);
}
int
Creat(char *file)
{
return creat(file, 0666L);
}
int
Dup(int a, int b)
{
return dup2(a, b);
}
int
Dup1(int a)
{
return dup(a);
}
void
Exit(void)
{
Updenv();
exit(truestatus()?0:1);
}
int
Eintr(void)
{
return errno==EINTR;
}
void
Noerror(void)
{
errno=0;
}
int
Isatty(int fd)
{
return isatty(fd);
}
void
Abort(void)
{
abort();
}
int
Chdir(char *dir)
{
return chdir(dir);
}
void
Prompt(char *s)
{
pstr(err, s);
flushio(err);
}