V10/cmd/usgmake/dosys.c

/*      %W%     */
/*      @(#)/usr/src/cmd/make/dosys.c   3.2     */
/*      @(#)dosys.c     3.1     */

# include "defs"
# include "sys/types.h"
# include "sys/stat.h"

extern char Makecall;


dosys(comstring, nohalt)
register CHARSTAR comstring;
int nohalt;
{
        register CHARSTAR p;
        register int i;
        int status;

        p = comstring;
        while(  *p == BLANK ||
                *p == TAB ||
                *p == AT ||
                *p == MINUS ||
                *p == NULL) p++;

        if(IS_ON(NOEX) && Makecall == NO)
                return(0);

        if(metas(comstring))
                status = doshell(comstring,nohalt);
        else
                status = doexec(comstring);

        return(status);
}



metas(s)   /* Are there are any  Shell meta-characters? */
register CHARSTAR s;
{
        while(*s)
                if( funny[*s++] & META)
                        return(YES);

        return(NO);
}

doshell(comstring,nohalt)
register CHARSTAR comstring;
register int nohalt;
{
        register CHARSTAR shell;

        if((waitpid = fork()) == 0)
        {
                enbint(0);
                doclose();

                setenv();
                shell = varptr("SHELL")->varval;
                if(shell == 0 || shell[0] == CNULL)
                        shell = SHELLCOM;
                execl(shell, "sh", (nohalt ? "-c" : "-ce"), comstring, 0);
                fatal("Couldn't load Shell");
        }

        return( await() );
}




await()
{
        int intrupt();
        int status;
        int pid;

        enbint(intrupt);
        while( (pid = wait(&status)) != waitpid)
                if(pid == -1)
                        fatal("bad wait code");
        waitpid = 0;
        return(status);
}






doclose()       /* Close open directory files before exec'ing */
{
        register OPENDIR od;

        for (od = firstod; od != 0; od = od->nextopendir)
                if (od->dirfc != NULL)
                        fclose(od->dirfc);
}





doexec(str)
register CHARSTAR str;
{
        register CHARSTAR t;
        register CHARSTAR *p;
        CHARSTAR argv[200];
        int status;

        while( *str==BLANK || *str==TAB )
                ++str;
        if( *str == CNULL )
                return(-1);     /* no command */

        p = argv;
        for(t = str ; *t ; )
        {
                *p++ = t;
                while(*t!=BLANK && *t!=TAB && *t!=CNULL)
                        ++t;
                if(*t)
                        for( *t++ = CNULL ; *t==BLANK || *t==TAB  ; ++t);
        }

        *p = NULL;

        if((waitpid = fork()) == 0)
        {
                enbint(0);
                doclose();
                setenv();
                execvp(str, argv);
                fatal1("Cannot load %s",str);
        }

        return( await() );
}

touch(force, name)
register int force;
register char *name;
{
        struct stat stbuff;
        char junk[1];
        int fd;

        if( stat(name,&stbuff) < 0)
                if(force)
                        goto create;
                else
                {
                        fprintf(stderr,"touch: file %s does not exist.\n",name);
                        return;
                }
        if(stbuff.st_size == 0)
                goto create;
        if( (fd = open(name, 2)) < 0)
                goto bad;
        if( read(fd, junk, 1) < 1)
        {
                close(fd);
                goto bad;
        }
        lseek(fd, 0L, 0);
        if( write(fd, junk, 1) < 1 )
        {
                close(fd);
                goto bad;
        }
        close(fd);
        return;
bad:
        fprintf(stderr, "Cannot touch %s\n", name);
        return;
create:
        if( (fd = creat(name, 0666)) < 0)
                goto bad;
        close(fd);
}