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Annotation of 43BSD/usr.lib/libU77/system_.c, revision 1.1.1.1

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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