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Diffstat (limited to 'lib/rdev.c')
| -rw-r--r-- | lib/rdev.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/lib/rdev.c b/lib/rdev.c new file mode 100644 index 0000000..9c5b6f4 --- /dev/null +++ b/lib/rdev.c @@ -0,0 +1,524 @@ +/* + * rdev.c -- readdev() function for lsof library + */ + + +/* + * Copyright 1997 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. + */ + + +#include "../machine.h" + +#if defined(USE_LIB_READDEV) + +# if !defined(lint) +static char copyright[] = +"@(#) Copyright 1997 Purdue Research Foundation.\nAll rights reserved.\n"; +static char *rcsid = "$Id: rdev.c,v 1.12 2008/10/21 16:13:23 abe Exp $"; +# endif /* !defined(lint) */ + +#include "../lsof.h" + + +_PROTOTYPE(static int rmdupdev,(struct l_dev ***dp, int n, char *nm)); + + +/* + * To use this source file: + * + * 1. Define DIRTYPE as: + * + * #define DIRTYPE direct + * or #define DIRTYPE dirent + * + * 2. Define HASDNAMLEN if struct DIRTYPE has a d_namlen element, giving + * the length of d_name. + * + * 3. Define the RDEV_EXPDEV macro to apply special handling to device + * numbers, as required. For example, for EP/IX 2.1.1: + * + * #define RDEV_EXPDEV(n) expdev(n) + * + * to use the expdev() function to expand device numbers. If + * no RDEV_EXPDEV macro is defined, it defaults to: + * + * #define RDEV_EXPDEV(n) (n) + * + * 4. Define HASBLKDEV to request that information on S_IFBLK devices be + * recorded in BDevtp[]. + * + * Define NOWARNBLKDEV to suppress the issuance of a warning when no + * block devices are found. + * + * 5. Define RDEV_STATFN to be a stat function other than stat() or lstat() + * -- e.g., + * + * #define RDEV_STATFN private_stat + * + * 6. Define HAS_STD_CLONE to request that clone device information be stored + * in standard clone structures (defined in lsof.h and addressed via + * Clone). If HAS_STD_CLONE is defined, these must also be defined: + * + * a. Define CLONEMAJ to be the name of the constant or + * variable that defines the clone major device -- e.g., + * + * #define CLONEMAJ CloneMaj + * + * b. Define HAVECLONEMAJ to be the name of the variable that + * contains the status of the clone major device -- e.g., + * + * #define HAVECLONEMAJ HaveCloneMaj + * + * Define HAS_STD_CLONE to be 1 if readdev() is expected to build the + * clone table, the clone table is cached (if HASDCACHE is defined), and + * there is a function to clear the cache table when the device table must + * be reloaded. (See dvch.c for naming the clone cache build and clear + * functions.) + */ + + +# if !defined(RDEV_EXPDEV) +#define RDEV_EXPDEV(n) (n) +# endif /* !defined(RDEV_EXPDEV) */ + +# if !defined(RDEV_STATFN) +# if defined(USE_STAT) +#define RDEV_STATFN stat +# else /* !defined(USE_STAT) */ +#define RDEV_STATFN lstat +# endif /* defined(USE_STAT) */ +# endif /* !defined(RDEV_STATFN) */ + + +/* + * readdev() - read device names, modes and types + */ + +void +readdev(skip) + int skip; /* skip device cache read if 1 */ +{ + +# if defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 + struct clone *c; +# endif /* defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 */ + +# if defined(HASDCACHE) + int dcrd; +# endif /* defined(HASDCACHE) */ + + DIR *dfp; + int dnamlen; + struct DIRTYPE *dp; + char *fp = (char *)NULL; + int i = 0; + +# if defined(HASBLKDEV) + int j = 0; +# endif /* defined(HASBLKDEV) */ + + char *path = (char *)NULL; + MALLOC_S pl; + struct stat sb; + + if (Sdev) + return; + +# if defined(HASDCACHE) +/* + * Read device cache, as directed. + */ + if (!skip) { + if (DCstate == 2 || DCstate == 3) { + if ((dcrd = read_dcache()) == 0) + return; + } + } else + dcrd = 1; +# endif /* defined(HASDCACHE) */ + + Dstkn = Dstkx = 0; + Dstk = (char **)NULL; + (void) stkdir("/dev"); +/* + * Unstack the next /dev or /dev/<subdirectory> directory. + */ + while (--Dstkx >= 0) { + if (!(dfp = OpenDir(Dstk[Dstkx]))) { + +# if defined(WARNDEVACCESS) + if (!Fwarn) { + (void) fprintf(stderr, "%s: WARNING: can't open: ", Pn); + safestrprt(Dstk[Dstkx], stderr, 1); + } +# endif /* defined(WARNDEVACCESS) */ + + (void) free((FREE_P *)Dstk[Dstkx]); + Dstk[Dstkx] = (char *)NULL; + continue; + } + if (path) { + (void) free((FREE_P *)path); + path = (char *)NULL; + } + if (!(path = mkstrcat(Dstk[Dstkx], -1, "/", 1, (char *)NULL, -1, + &pl))) + { + (void) fprintf(stderr, "%s: no space for: ", Pn); + safestrprt(Dstk[Dstkx], stderr, 1); + Exit(1); + } + (void) free((FREE_P *)Dstk[Dstkx]); + Dstk[Dstkx] = (char *)NULL; + /* + * Scan the directory. + */ + for (dp = ReadDir(dfp); dp; dp = ReadDir(dfp)) { + if (dp->d_ino == 0 || dp->d_name[0] == '.') + continue; + /* + * Form the full path name and get its status. + */ + +# if defined(HASDNAMLEN) + dnamlen = (int)dp->d_namlen; +# else /* !defined(HASDNAMLEN) */ + dnamlen = (int)strlen(dp->d_name); +# endif /* defined(HASDNAMLEN) */ + + if (fp) { + (void) free((FREE_P *)fp); + fp = (char *)NULL; + } + if (!(fp = mkstrcat(path, pl, dp->d_name, dnamlen, + (char *)NULL, -1, (MALLOC_S *)NULL))) + { + (void) fprintf(stderr, "%s: no space for: ", Pn); + safestrprt(path, stderr, 0); + safestrprtn(dp->d_name, dnamlen, stderr, 1); + Exit(1); + } + if (RDEV_STATFN(fp, &sb) != 0) { + if (errno == ENOENT) /* a sym link to nowhere? */ + continue; + +# if defined(WARNDEVACCESS) + if (!Fwarn) { + int errno_save = errno; + + (void) fprintf(stderr, "%s: can't stat ", Pn); + safestrprt(fp, stderr, 0); + (void) fprintf(stderr, ": %s\n", strerror(errno_save)); + } +# endif /* defined(WARNDEVACCESS) */ + + continue; + } + /* + * If it's a subdirectory, stack its name for later + * processing. + */ + if ((sb.st_mode & S_IFMT) == S_IFDIR) { + (void) stkdir(fp); + continue; + } + if ((sb.st_mode & S_IFMT) == S_IFCHR) { + + /* + * Save character device information in Devtp[]. + */ + if (i >= Ndev) { + Ndev += DEVINCR; + if (!Devtp) + Devtp = (struct l_dev *)malloc( + (MALLOC_S)(sizeof(struct l_dev)*Ndev)); + else + Devtp = (struct l_dev *)realloc((MALLOC_P *)Devtp, + (MALLOC_S)(sizeof(struct l_dev)*Ndev)); + if (!Devtp) { + (void) fprintf(stderr, + "%s: no space for character device\n", Pn); + Exit(1); + } + } + Devtp[i].rdev = RDEV_EXPDEV(sb.st_rdev); + Devtp[i].inode = (INODETYPE)sb.st_ino; + if (!(Devtp[i].name = mkstrcpy(fp, (MALLOC_S *)NULL))) { + (void) fprintf(stderr, + "%s: no space for device name: ", Pn); + safestrprt(fp, stderr, 1); + Exit(1); + } + Devtp[i].v = 0; + +# if defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 + if (HAVECLONEMAJ && GET_MAJ_DEV(Devtp[i].rdev) == CLONEMAJ) + { + + /* + * Record clone device information. + */ + if (!(c = (struct clone *)malloc(sizeof(struct clone)))) + { + (void) fprintf(stderr, + "%s: no space for clone device: ", Pn); + safestrprt(fp, stderr, 1); + Exit(1); + } + c->dx = i; + c->next = Clone; + Clone = c; + } +# endif /* defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 */ + + i++; + } + +# if defined(HASBLKDEV) + if ((sb.st_mode & S_IFMT) == S_IFBLK) { + + /* + * Save block device information in BDevtp[]. + */ + if (j >= BNdev) { + BNdev += DEVINCR; + if (!BDevtp) + BDevtp = (struct l_dev *)malloc( + (MALLOC_S)(sizeof(struct l_dev)*BNdev)); + else + BDevtp = (struct l_dev *)realloc((MALLOC_P *)BDevtp, + (MALLOC_S)(sizeof(struct l_dev)*BNdev)); + if (!BDevtp) { + (void) fprintf(stderr, + "%s: no space for block device\n", Pn); + Exit(1); + } + } + BDevtp[j].name = fp; + fp = (char *)NULL; + BDevtp[j].inode = (INODETYPE)sb.st_ino; + BDevtp[j].rdev = RDEV_EXPDEV(sb.st_rdev); + BDevtp[j].v = 0; + j++; + } +# endif /* defined(HASBLKDEV) */ + + } + (void) CloseDir(dfp); + } +/* + * Free any allocated space. + */ + if (!Dstk) { + (void) free((FREE_P *)Dstk); + Dstk = (char **)NULL; + } + if (fp) + (void) free((FREE_P *)fp); + if (path) + (void) free((FREE_P *)path); + +# if defined(HASBLKDEV) +/* + * Reduce the BDevtp[] (optional) and Devtp[] tables to their minimum + * sizes; allocate and build sort pointer lists; and sort the tables by + * device number. + */ + if (BNdev) { + if (BNdev > j) { + BNdev = j; + BDevtp = (struct l_dev *)realloc((MALLOC_P *)BDevtp, + (MALLOC_S)(sizeof(struct l_dev) * BNdev)); + } + if (!(BSdev = (struct l_dev **)malloc( + (MALLOC_S)(sizeof(struct l_dev *) * BNdev)))) + { + (void) fprintf(stderr, + "%s: no space for block device sort pointers\n", Pn); + Exit(1); + } + for (j = 0; j < BNdev; j++) { + BSdev[j] = &BDevtp[j]; + } + (void) qsort((QSORT_P *)BSdev, (size_t)BNdev, + (size_t)sizeof(struct l_dev *), compdev); + BNdev = rmdupdev(&BSdev, BNdev, "block"); + } + +# if !defined(NOWARNBLKDEV) + else { + if (!Fwarn) + (void) fprintf(stderr, + "%s: WARNING: no block devices found\n", Pn); + } +# endif /* !defined(NOWARNBLKDEV) */ +# endif /* defined(HASBLKDEV) */ + + if (Ndev) { + if (Ndev > i) { + Ndev = i; + Devtp = (struct l_dev *)realloc((MALLOC_P *)Devtp, + (MALLOC_S)(sizeof(struct l_dev) * Ndev)); + } + if (!(Sdev = (struct l_dev **)malloc( + (MALLOC_S)(sizeof(struct l_dev *) * Ndev)))) + { + (void) fprintf(stderr, + "%s: no space for character device sort pointers\n", Pn); + Exit(1); + } + for (i = 0; i < Ndev; i++) { + Sdev[i] = &Devtp[i]; + } + (void) qsort((QSORT_P *)Sdev, (size_t)Ndev, + (size_t)sizeof(struct l_dev *), compdev); + Ndev = rmdupdev(&Sdev, Ndev, "char"); + } else { + (void) fprintf(stderr, "%s: no character devices found\n", Pn); + Exit(1); + } + +# if defined(HASDCACHE) +/* + * Write device cache file, as required. + */ + if (DCstate == 1 || (DCstate == 3 && dcrd)) + write_dcache(); +# endif /* defined(HASDCACHE) */ + +} + + +# if defined(HASDCACHE) +/* + * rereaddev() - reread device names, modes and types + */ + +void +rereaddev() +{ + (void) clr_devtab(); + +# if defined(DCACHE_CLR) + (void) DCACHE_CLR(); +# endif /* defined(DCACHE_CLR) */ + + readdev(1); + DCunsafe = 0; +} +#endif /* defined(HASDCACHE) */ + + +/* + * rmdupdev() - remove duplicate (major/minor/inode) devices + */ + +static int +rmdupdev(dp, n, nm) + struct l_dev ***dp; /* device table pointers address */ + int n; /* number of pointers */ + char *nm; /* device table name for error message */ +{ + +# if defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 + struct clone *c, *cp; +# endif /* defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 */ + + int i, j, k; + struct l_dev **p; + + for (i = j = 0, p = *dp; i < n ;) { + for (k = i + 1; k < n; k++) { + if (p[i]->rdev != p[k]->rdev || p[i]->inode != p[k]->inode) + break; + +# if defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 + /* + * See if we're deleting a duplicate clone device. If so, + * delete its clone table entry. + */ + for (c = Clone, cp = (struct clone *)NULL; + c; + cp = c, c = c->next) + { + if (&Devtp[c->dx] != p[k]) + continue; + if (!cp) + Clone = c->next; + else + cp->next = c->next; + (void) free((FREE_P *)c); + break; + } +# endif /* defined(HAS_STD_CLONE) && HAS_STD_CLONE==1 */ + + } + if (i != j) + p[j] = p[i]; + j++; + i = k; + } + if (n == j) + return(n); + if (!(*dp = (struct l_dev **)realloc((MALLOC_P *)*dp, + (MALLOC_S)(j * sizeof(struct l_dev *))))) + { + (void) fprintf(stderr, "%s: can't realloc %s device pointers\n", + Pn, nm); + Exit(1); + } + return(j); +} + + +# if defined(HASDCACHE) +/* + * vfy_dev() - verify a device table entry (usually when DCunsafe == 1) + * + * Note: rereads entire device table when an entry can't be verified. + */ + +int +vfy_dev(dp) + struct l_dev *dp; /* device table pointer */ +{ + struct stat sb; + + if (!DCunsafe || dp->v) + return(1); + if (RDEV_STATFN(dp->name, &sb) != 0 + || dp->rdev != RDEV_EXPDEV(sb.st_rdev) + || dp->inode != sb.st_ino) { + (void) rereaddev(); + return(0); + } + dp->v = 1; + return(1); +} +# endif /* defined(HASDCACHE) */ +#else /* !defined(USE_LIB_READDEV) */ +char rdev_d1[] = "d"; char *rdev_d2 = rdev_d1; +#endif /* defined(USE_LIB_READDEV) */ |