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Annotation of 43BSDReno/usr.bin/nohup/nohup.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)nohup.c    5.4 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: #include <sys/param.h>
        !            31: #include <sys/signal.h>
        !            32: #include <sys/file.h>
        !            33: #include <unistd.h>
        !            34: #include <stdio.h>
        !            35: 
        !            36: extern int errno;
        !            37: 
        !            38: main(argc, argv)
        !            39:        int argc;
        !            40:        char **argv;
        !            41: {
        !            42:        char *strerror();
        !            43: 
        !            44:        if (argc < 2)
        !            45:                usage();
        !            46: 
        !            47:        if (isatty(STDOUT_FILENO))
        !            48:                dofile();
        !            49:        if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
        !            50:                /* may have just closed stderr */
        !            51:                (void)fprintf(stdin, "nohup: %s\n", strerror(errno));
        !            52:                exit(1);
        !            53:        }
        !            54: 
        !            55:        (void)signal(SIGHUP, SIG_IGN);
        !            56:        (void)signal(SIGQUIT, SIG_IGN);
        !            57: 
        !            58:        execvp(argv[1], &argv[1]);
        !            59:        (void)fprintf(stderr,
        !            60:            "nohup: %s: %s\n", argv[1], strerror(errno));
        !            61:        exit(1);
        !            62: }
        !            63: 
        !            64: dofile()
        !            65: {
        !            66:        int fd;
        !            67:        char *p, path[MAXPATHLEN];
        !            68:        off_t lseek();
        !            69:        char *getenv(), *strcpy(), *strcat(), *strerror();
        !            70: 
        !            71: #define        FILENAME        "nohup.out"
        !            72:        p = FILENAME;
        !            73:        if ((fd = open(p, O_RDWR|O_CREAT, 0600)) >= 0)
        !            74:                goto dupit;
        !            75:        if (p = getenv("HOME")) {
        !            76:                (void)strcpy(path, p);
        !            77:                (void)strcat(path, "/");
        !            78:                (void)strcat(path, FILENAME);
        !            79:                if ((fd = open(p = path, O_RDWR|O_CREAT, 0600)) >= 0)
        !            80:                        goto dupit;
        !            81:        }
        !            82:        (void)fprintf(stderr, "nohup: can't open a nohup.out file.\n");
        !            83:        exit(1);
        !            84: 
        !            85: dupit: (void)lseek(fd, 0L, SEEK_END);
        !            86:        if (dup2(fd, STDOUT_FILENO) == -1) {
        !            87:                (void)fprintf(stderr, "nohup: %s\n", strerror(errno));
        !            88:                exit(1);
        !            89:        }
        !            90:        (void)fprintf(stderr, "sending output to %s\n", p);
        !            91: }
        !            92: 
        !            93: usage()
        !            94: {
        !            95:        (void)fprintf(stderr, "usage: nohup command\n");
        !            96:        exit(1);
        !            97: }

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