NetBSD/usr.bin/nohup/nohup.c

112 lines
3.4 KiB
C

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