lib/dialects/osr/dfile.c - master - githubmirror/lsof

lib/dialects/osr/dfile.c
140 строк4 KB
Chen
Expose functionality as a re-usable library - Part 2 (#284)
12 апр 2023, 09:01
12 апр 2023, 09:016dca348
/*
 * dfile.c - SCO OpenServer file processing functions for lsof
 */

/*
 * Copyright 1995 Purdue Research Foundation, West Lafayette, Indiana
 * 47907.  All rights reserved.
 *
 * Written by Victor A. Abell
 *
 * This software is not subject to any license of the American Telephone
 * and Telegraph Company or the Regents of the University of California.
 *
 * Permission is granted to anyone to use this software for any purpose on
 * any computer system, and to alter it and redistribute it freely, subject
 * to the following restrictions:
 *
 * 1. Neither the authors nor Purdue University are responsible for any
 *    consequences of the use of this software.
 *
 * 2. The origin of this software must not be misrepresented, either by
 *    explicit claim or by omission.  Credit to the authors and Purdue
 *    University must appear in documentation and sources.
 *
 * 3. Altered versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 4. This notice may not be removed or altered.
 */

#ifndef lint
static char copyright[] =
    "@(#) Copyright 1995 Purdue Research Foundation.\nAll rights reserved.\n";
#endif

#include "common.h"

/*
 * get_max_fd() - get maximum file descriptor plus one
 */

int get_max_fd() {

#if defined(F_GETHFDO) || defined(_SC_OPEN_MAX)
    int nd;
#endif /* defined(F_GETHFDO) || defined(_SC_OPEN_MAX) */

#if defined(F_GETHFDO)
    if ((nd = fcntl(-1, F_GETHFDO, 0)) >= 0)
        return (nd);
#endif /* defined(F_GETHFDO) */

#if defined(_SC_OPEN_MAX)
    if ((nd = sysconf(_SC_OPEN_MAX)) >= 0)
        return (nd);
#endif /* defined(_SC_OPEN_MAX) */

    return (getdtablesize());
}

/*
 * print_dev() - print dev
 */

char *print_dev(struct lfile *lf, /* file whose device is to be printed */
                dev_t *dev)       /* device to be printed */
{
    static char buf[128];

    (void)snpf(buf, sizeof(buf), "%d,%d",
               lf->is_nfs ? ((~(*dev >> 8)) & 0xff) : emajor(*dev),
               eminor(*dev));
    return (buf);
}

/*
 * print_ino() - print inode
 */

char *print_ino(struct lfile *lf) /* file whose device is to be printed */
{
    static char buf[128];

    (void)snpf(buf, sizeof(buf), (lf->inode & 0x80000000) ? "%#x" : "%lu",
               lf->inode);
    return (buf);
}

/*
 * process_file() - process file
 */

void process_file(fp) KA_T fp; /* kernel file structure address */
{
    struct file f;
    int flag;

    if (kread(ctx, fp, (char *)&f, sizeof(f))) {
        (void)snpf(Namech, Namechl, "can't read file struct from %s",
                   print_kptr(fp, (char *)NULL, 0));
        enter_nm(Namech);
        return;
    }
    Lf->off = (SZOFFTYPE)f.f_offset;
    Lf->off_def = 1;

    if (f.f_count) {

        /*
         * Construct access code.
         */
        if ((flag = (f.f_flag & (FREAD | FWRITE))) == FREAD)
            Lf->access = LSOF_FILE_ACCESS_READ;
        else if (flag == FWRITE)
            Lf->access = LSOF_FILE_ACCESS_WRITE;
        else if (flag == (FREAD | FWRITE))
            Lf->access = LSOF_FILE_ACCESS_READ_WRITE;
            /*
             * Process structure.
             */

#if defined(HASFSTRUCT)
        /*
         * Save file structure values.
         */
        Lf->fct = (long)f.f_count;
        Lf->fsv |= FSV_CT;
        Lf->fsa = fp;
        Lf->fsv |= FSV_FA;
        Lf->ffg = (long)f.f_flag;
        Lf->fsv |= FSV_FG;
        Lf->fna = (KA_T)f.f_inode;
        Lf->fsv |= FSV_NI;
#endif /* defined(HASFSTRUCT) */

        process_node((KA_T)f.f_inode);
        return;
    }
    enter_nm("no more information");
}