112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER 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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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)nohup.c 5.4 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/signal.h>
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#include <sys/file.h>
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#include <unistd.h>
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#include <stdio.h>
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extern int errno;
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main(argc, argv)
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int argc;
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char **argv;
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{
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char *strerror();
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if (argc < 2)
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usage();
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if (isatty(STDOUT_FILENO))
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dofile();
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if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
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/* may have just closed stderr */
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(void)fprintf(stdin, "nohup: %s\n", strerror(errno));
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exit(1);
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}
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(void)signal(SIGHUP, SIG_IGN);
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(void)signal(SIGQUIT, SIG_IGN);
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execvp(argv[1], &argv[1]);
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(void)fprintf(stderr,
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"nohup: %s: %s\n", argv[1], strerror(errno));
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exit(1);
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}
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dofile()
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{
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int fd;
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char *p, path[MAXPATHLEN];
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off_t lseek();
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char *getenv(), *strcpy(), *strcat(), *strerror();
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#define FILENAME "nohup.out"
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p = FILENAME;
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if ((fd = open(p, O_RDWR|O_CREAT, 0600)) >= 0)
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goto dupit;
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if (p = getenv("HOME")) {
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(void)strcpy(path, p);
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(void)strcat(path, "/");
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(void)strcat(path, FILENAME);
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if ((fd = open(p = path, O_RDWR|O_CREAT, 0600)) >= 0)
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goto dupit;
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}
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(void)fprintf(stderr, "nohup: can't open a nohup.out file.\n");
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exit(1);
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dupit: (void)lseek(fd, 0L, SEEK_END);
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if (dup2(fd, STDOUT_FILENO) == -1) {
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(void)fprintf(stderr, "nohup: %s\n", strerror(errno));
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exit(1);
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}
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(void)fprintf(stderr, "sending output to %s\n", p);
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}
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usage()
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{
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(void)fprintf(stderr, "usage: nohup command\n");
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exit(1);
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}
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