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Annotation of 43BSD/usr.lib/libU77/system_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)system_.c   5.1     6/7/85
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * execute a unix command
        !            11:  *
        !            12:  * calling sequence:
        !            13:  *     iexit = system(command)
        !            14:  * where:
        !            15:  *     iexit will return the exit status of the command
        !            16:  *     command is a character string containing the command to be executed
        !            17:  */
        !            18: 
        !            19: #include       "../libI77/fiodefs.h"
        !            20: #include       "../libI77/f_errno.h"
        !            21: #include <sys/param.h>
        !            22: #ifndef        NCARGS
        !            23: #define NCARGS 256
        !            24: #endif
        !            25: 
        !            26:  
        !            27: long system_(s, n)
        !            28: char *s;
        !            29: long n;
        !            30: {
        !            31:        char buf[NCARGS - 50];
        !            32:        long i;
        !            33: 
        !            34:        if (n >= sizeof buf)
        !            35:                return(-(long)(errno=F_ERARG));
        !            36:        for (i = 0; i < MXUNIT; i++)
        !            37:                flush_(&i);
        !            38:        g_char(s, n, buf);
        !            39:        return((long)system(buf));
        !            40: }
        !            41: 
        !            42: /*
        !            43:  * this is a sane version of the libc/stdio routine.
        !            44:  */
        !            45: 
        !            46: #include       <signal.h>
        !            47: 
        !            48: char   *getenv();
        !            49: char   *rindex();
        !            50: 
        !            51: system(s)
        !            52: char *s;
        !            53: {
        !            54:        register int (*istat)(), (*qstat)();
        !            55:        int status, pid, w;
        !            56:        char    *shname, *shell;
        !            57: 
        !            58:        if ((shell = getenv("SHELL")) == NULL)
        !            59:                shell = "/bin/sh";
        !            60: 
        !            61:        if (shname = rindex(shell, '/'))
        !            62:                shname++;
        !            63:        else
        !            64:                shname = shell;
        !            65: 
        !            66:        if ((pid = fork()) == 0) {
        !            67:                execl(shell, shname, "-c", s, 0);
        !            68:                _exit(127);
        !            69:        }
        !            70:        istat = signal(SIGINT, SIG_IGN);
        !            71:        qstat = signal(SIGQUIT, SIG_IGN);
        !            72:        while ((w = wait(&status)) != pid && w != -1)
        !            73:                ;
        !            74:        if (w == -1)
        !            75:                status = -1;
        !            76:        signal(SIGINT, istat);
        !            77:        signal(SIGQUIT, qstat);
        !            78:        return(status);
        !            79: }

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