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/* misc.c
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Copyright (c) 2000-2002 Craig Condit, Stefan Hülswitt.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <errno.h>
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extern char *prg_name;
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/****************************************************************************/
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void error(char *text)
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{
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fprintf(stderr,"%s: %s: %s\n",prg_name,text,strerror(errno));
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exit(1);
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}
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/****************************************************************************/
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void serror(char *text)
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{
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fprintf(stderr,"%s: %s\n",prg_name,text);
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exit(1);
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}
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/****************************************************************************/
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int start_diskchange(char *multicmd, char *cd_dev)
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{
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int pid, status=0;
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char buffer[12];
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if(multicmd) { /* we have an external script */
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if((pid=fork())<0) error("Fork failed in diskchange");
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if(pid==0) { /* child */
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char *argv[3];
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dup2(2,0); dup2(2,1); /* duplicate stderr as stdin/stdout */
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argv[0] = multicmd;
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argv[1] = cd_dev;
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argv[2] = 0;
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execvp(multicmd, argv);
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error("Starting diskchange command failed");
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}
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while(1) {
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if(waitpid(pid,&status,0)==-1) { if (errno != EINTR) { status=-1; break; } }
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else break;
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}
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}
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else { /* use internal diskchange */
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fprintf(stderr,"\n\nPlease insert next disk and press RETURN\n\n\n");
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do {
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pid=read(2,buffer,sizeof(buffer));
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} while(pid==sizeof(buffer) && buffer[sizeof(buffer)-1]!='\n');
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}
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return status;
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}
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