Annotation of fam/fam/IMonLinux.c++, Revision 1.1
1.1 ! trev 1: // Copyright (C) 1999 Silicon Graphics, Inc. All Rights Reserved.
! 2: //
! 3: // This program is free software; you can redistribute it and/or modify it
! 4: // under the terms of version 2 of the GNU General Public License as
! 5: // published by the Free Software Foundation.
! 6: //
! 7: // This program is distributed in the hope that it would be useful, but
! 8: // WITHOUT ANY WARRANTY; without even the implied warranty of
! 9: // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Further, any
! 10: // license provided herein, whether implied or otherwise, is limited to
! 11: // this program in accordance with the express provisions of the GNU
! 12: // General Public License. Patent licenses, if any, provided herein do not
! 13: // apply to combinations of this program with other product or programs, or
! 14: // any other product whatsoever. This program is distributed without any
! 15: // warranty that the program is delivered free of the rightful claim of any
! 16: // third person by way of infringement or the like. See the GNU General
! 17: // Public License for more details.
! 18: //
! 19: // You should have received a copy of the GNU General Public License along
! 20: // with this program; if not, write the Free Software Foundation, Inc., 59
! 21: // Temple Place - Suite 330, Boston MA 02111-1307, USA.
! 22:
! 23: #include "IMon.h"
! 24: #include "Log.h"
! 25:
! 26: #include <stdio.h>
! 27: #include <unistd.h>
! 28: #include <fcntl.h>
! 29: #include <stdlib.h>
! 30: #include <string.h>
! 31:
! 32: #include <sys/types.h>
! 33: #include <sys/wait.h>
! 34:
! 35: #include <sys/ioctl.h>
! 36: #include <sys/sysmacros.h>
! 37: #include <linux/imon.h>
! 38:
! 39: #define DEV_IMON "/dev/imon"
! 40: const intmask_t INTEREST_MASK = (IMON_CONTENT | IMON_ATTRIBUTE | IMON_DELETE |
! 41: IMON_EXEC | IMON_EXIT);
! 42:
! 43: enum OpenStatus { OPEN_OK, OPEN_RETRY, OPEN_FAILED };
! 44:
! 45: static OpenStatus open_device(int& imonfd)
! 46: {
! 47: int major;
! 48: bool foundMajor = false;
! 49: char line[100], name[100];
! 50:
! 51: FILE* dev = fopen("/proc/devices", "r");
! 52: if (!dev) {
! 53: Log::critical("can't open /proc/devices: %m");
! 54: return OPEN_FAILED;
! 55: }
! 56: while (fgets(line, sizeof line, dev) != NULL) {
! 57: if (sscanf(line, "%d %s\n", &major, name) == 2
! 58: && strcmp(name, "imon") == 0) {
! 59: foundMajor = true;
! 60: break;
! 61: }
! 62: }
! 63: fclose(dev);
! 64:
! 65: if (!foundMajor) {
! 66: return OPEN_RETRY;
! 67: }
! 68:
! 69: (void)unlink(DEV_IMON);
! 70: if (mknod(DEV_IMON, S_IFCHR | 0600, makedev(major, 0)) == -1) {
! 71: Log::critical("can't create %s: %m", DEV_IMON);
! 72: return OPEN_FAILED;
! 73: }
! 74:
! 75: int imon = open(DEV_IMON, O_RDONLY | O_NONBLOCK);
! 76: (void)unlink(DEV_IMON);
! 77: if (imon == -1) {
! 78: Log::critical("can't open %s: %m", DEV_IMON);
! 79: return OPEN_FAILED;
! 80: }
! 81: imonfd = imon;
! 82: return OPEN_OK;
! 83: }
! 84:
! 85: static void insmod()
! 86: {
! 87: pid_t pid = fork();
! 88: if (pid == 0) {
! 89: execl("/sbin/insmod", "insmod", "imon", NULL);
! 90: exit(1);
! 91: }
! 92: if (pid > 0) {
! 93: waitpid(pid, NULL, 0);
! 94: }
! 95: }
! 96:
! 97: int IMon::imon_open()
! 98: {
! 99: int imon;
! 100: OpenStatus status = open_device(imon);
! 101: if (status == OPEN_RETRY) {
! 102: insmod();
! 103: status = open_device(imon);
! 104: }
! 105: if (status == OPEN_RETRY) {
! 106: Log::critical("can't open %s: imon major number not found in /proc/devices", DEV_IMON);
! 107: return -1;
! 108: }
! 109: if (status != OPEN_OK) {
! 110: Log::critical("can't open %s: %m", DEV_IMON);
! 111: return -1;
! 112: }
! 113: return imon;
! 114: }
! 115:
! 116: IMon::Status IMon::imon_express(const char *name, struct stat *status)
! 117: {
! 118: famstat_t famstat;
! 119: struct interest interest = { name, &famstat, INTEREST_MASK };
! 120: int rc = ioctl(imonfd, IMONIOC_EXPRESS, &interest);
! 121: if (rc < 0)
! 122: {
! 123: if (name[0] == '/') {
! 124: Log::info("IMONIOC_EXPRESS on \"%s\" failed (euid: %i): %m",
! 125: name, geteuid());
! 126: } else {
! 127: char * cwd = getcwd(0, 256);
! 128: Log::info("IMONIOC_EXPRESS on \"%s\" with cwd \"%s\" failed (euid: %i): %m",
! 129: name,cwd,geteuid());
! 130: free(cwd);
! 131: }
! 132: return BAD;
! 133: }
! 134:
! 135: //
! 136: // Check for a race condition; if someone removed or changed the
! 137: // file at the same time that we are expressing interest in it,
! 138: // revoke the interest so we don't get notifications about changes
! 139: // to a recycled inode that we don't otherwise care about.
! 140: //
! 141: struct stat st;
! 142: if (status == NULL) {
! 143: status = &st;
! 144: }
! 145: if (stat(name, status) == -1) {
! 146: Log::perror("stat on \"%s\" failed", name);
! 147: revoke(name, famstat.st_dev, famstat.st_ino);
! 148: return BAD;
! 149: }
! 150: if (status->st_dev != famstat.st_dev
! 151: || status->st_ino != famstat.st_ino) {
! 152: Log::error("File \"%s\" changed between express and stat",
! 153: name);
! 154: revoke(name, famstat.st_dev, famstat.st_ino);
! 155: return BAD;
! 156: }
! 157:
! 158: Log::debug("told imon to monitor \"%s\" = dev %d/%d, ino %d", name,
! 159: major(status->st_dev), minor(status->st_dev),
! 160: status->st_ino);
! 161:
! 162: return OK;
! 163: }
! 164:
! 165: IMon::Status IMon::imon_revoke(const char *name, dev_t dev, ino_t ino)
! 166: {
! 167: revoke_t rv = { dev, ino, INTEREST_MASK };
! 168: int rc = ioctl(imonfd, IMONIOC_REVOKE, &rv);
! 169: if (rc < 0) {
! 170: Log::perror("IMONIOC_REVOKE on \"%s\" failed", name);
! 171: return BAD;
! 172: }
! 173: Log::debug("told imon to forget \"%s\"", name);
! 174: return OK;
! 175: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to IMonLinux.c++ CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [Development] / fam / fam