2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998-2005
6 Copyright (C) Timur Bakeyev 2005
7 Copyright (C) Bjoern Jacke 2006-2007
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "system/syslog.h"
25 #include "system/capability.h"
26 #include "system/passwd.h"
27 #include "system/filesys.h"
28 #include "lib/util/setid.h"
29 #include "lib/util/time.h"
31 #ifdef HAVE_SYS_SYSCTL_H
32 #include <sys/sysctl.h>
35 #ifdef HAVE_SYS_PRCTL_H
36 #include <sys/prctl.h>
40 The idea is that this file will eventually have wrappers around all
41 important system calls in samba. The aims are:
43 - to enable easier porting by putting OS dependent stuff in here
45 - to allow for hooks into other "pseudo-filesystems"
47 - to allow easier integration of things like the japanese extensions
49 - to support the philosophy of Samba to expose the features of
50 the OS within the SMB model. In general whatever file/printer/variable
51 expansions/etc make sense to the OS should be acceptable to Samba.
54 /*******************************************************************
55 A send wrapper that will deal with EINTR or EAGAIN or EWOULDBLOCK.
56 ********************************************************************/
58 ssize_t sys_send(int s, const void *msg, size_t len, int flags)
63 ret = send(s, msg, len, flags);
64 } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
69 /*******************************************************************
70 A recvfrom wrapper that will deal with EINTR.
71 NB. As used with non-blocking sockets, return on EAGAIN/EWOULDBLOCK
72 ********************************************************************/
74 ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
79 ret = recvfrom(s, buf, len, flags, from, fromlen);
80 } while (ret == -1 && (errno == EINTR));
84 /*******************************************************************
85 A fcntl wrapper that will deal with EINTR.
86 ********************************************************************/
88 int sys_fcntl_ptr(int fd, int cmd, void *arg)
93 ret = fcntl(fd, cmd, arg);
94 } while (ret == -1 && errno == EINTR);
98 /*******************************************************************
99 A fcntl wrapper that will deal with EINTR.
100 ********************************************************************/
102 int sys_fcntl_long(int fd, int cmd, long arg)
107 ret = fcntl(fd, cmd, arg);
108 } while (ret == -1 && errno == EINTR);
112 /*******************************************************************
113 A fcntl wrapper that will deal with EINTR.
114 ********************************************************************/
116 int sys_fcntl_int(int fd, int cmd, int arg)
121 ret = fcntl(fd, cmd, arg);
122 } while (ret == -1 && errno == EINTR);
126 /****************************************************************************
127 Return the best approximation to a 'create time' under UNIX from a stat
129 ****************************************************************************/
131 static struct timespec calc_create_time_stat(const struct stat *st)
133 struct timespec ret, ret1;
134 struct timespec c_time = get_ctimespec(st);
135 struct timespec m_time = get_mtimespec(st);
136 struct timespec a_time = get_atimespec(st);
138 ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
139 ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
141 if(!null_timespec(ret1)) {
146 * One of ctime, mtime or atime was zero (probably atime).
147 * Just return MIN(ctime, mtime).
152 /****************************************************************************
153 Return the best approximation to a 'create time' under UNIX from a stat_ex
155 ****************************************************************************/
157 static struct timespec calc_create_time_stat_ex(const struct stat_ex *st)
159 struct timespec ret, ret1;
160 struct timespec c_time = st->st_ex_ctime;
161 struct timespec m_time = st->st_ex_mtime;
162 struct timespec a_time = st->st_ex_atime;
164 ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
165 ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
167 if(!null_timespec(ret1)) {
172 * One of ctime, mtime or atime was zero (probably atime).
173 * Just return MIN(ctime, mtime).
178 /****************************************************************************
179 Return the 'create time' from a stat struct if it exists (birthtime) or else
180 use the best approximation.
181 ****************************************************************************/
183 static void make_create_timespec(const struct stat *pst, struct stat_ex *dst,
184 bool fake_dir_create_times)
186 if (S_ISDIR(pst->st_mode) && fake_dir_create_times) {
187 dst->st_ex_btime.tv_sec = 315493200L; /* 1/1/1980 */
188 dst->st_ex_btime.tv_nsec = 0;
191 dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
193 #if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC)
194 dst->st_ex_btime = pst->st_birthtimespec;
195 #elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
196 dst->st_ex_btime.tv_sec = pst->st_birthtime;
197 dst->st_ex_btime.tv_nsec = pst->st_birthtimenspec;
198 #elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIME)
199 dst->st_ex_btime.tv_sec = pst->st_birthtime;
200 dst->st_ex_btime.tv_nsec = 0;
202 dst->st_ex_btime = calc_create_time_stat(pst);
203 dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
206 /* Deal with systems that don't initialize birthtime correctly.
207 * Pointed out by SATOH Fumiyasu <fumiyas@osstech.jp>.
209 if (null_timespec(dst->st_ex_btime)) {
210 dst->st_ex_btime = calc_create_time_stat(pst);
211 dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
215 /****************************************************************************
216 If we update a timestamp in a stat_ex struct we may have to recalculate
217 the birthtime. For now only implement this for write time, but we may
218 also need to do it for atime and ctime. JRA.
219 ****************************************************************************/
221 void update_stat_ex_mtime(struct stat_ex *dst,
222 struct timespec write_ts)
224 dst->st_ex_mtime = write_ts;
226 /* We may have to recalculate btime. */
227 if (dst->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME) {
228 dst->st_ex_btime = calc_create_time_stat_ex(dst);
232 void update_stat_ex_create_time(struct stat_ex *dst,
233 struct timespec create_time)
235 dst->st_ex_btime = create_time;
236 dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
239 void update_stat_ex_from_saved_stat(struct stat_ex *dst,
240 const struct stat_ex *src)
242 if (!VALID_STAT(*src)) {
246 if (!(src->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME)) {
247 update_stat_ex_create_time(dst, src->st_ex_btime);
251 void init_stat_ex_from_stat (struct stat_ex *dst,
252 const struct stat *src,
253 bool fake_dir_create_times)
255 dst->st_ex_dev = src->st_dev;
256 dst->st_ex_ino = src->st_ino;
257 dst->st_ex_mode = src->st_mode;
258 dst->st_ex_nlink = src->st_nlink;
259 dst->st_ex_uid = src->st_uid;
260 dst->st_ex_gid = src->st_gid;
261 dst->st_ex_rdev = src->st_rdev;
262 dst->st_ex_size = src->st_size;
263 dst->st_ex_atime = get_atimespec(src);
264 dst->st_ex_mtime = get_mtimespec(src);
265 dst->st_ex_ctime = get_ctimespec(src);
266 dst->st_ex_iflags = 0;
267 make_create_timespec(src, dst, fake_dir_create_times);
268 #ifdef HAVE_STAT_ST_BLKSIZE
269 dst->st_ex_blksize = src->st_blksize;
271 dst->st_ex_blksize = STAT_ST_BLOCKSIZE;
274 #ifdef HAVE_STAT_ST_BLOCKS
275 dst->st_ex_blocks = src->st_blocks;
277 dst->st_ex_blocks = src->st_size / dst->st_ex_blksize + 1;
280 #ifdef HAVE_STAT_ST_FLAGS
281 dst->st_ex_flags = src->st_flags;
283 dst->st_ex_flags = 0;
287 /*******************************************************************
289 ********************************************************************/
291 int sys_stat(const char *fname, SMB_STRUCT_STAT *sbuf,
292 bool fake_dir_create_times)
296 ret = stat(fname, &statbuf);
298 /* we always want directories to appear zero size */
299 if (S_ISDIR(statbuf.st_mode)) {
302 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
307 /*******************************************************************
309 ********************************************************************/
311 int sys_fstat(int fd, SMB_STRUCT_STAT *sbuf, bool fake_dir_create_times)
315 ret = fstat(fd, &statbuf);
317 /* we always want directories to appear zero size */
318 if (S_ISDIR(statbuf.st_mode)) {
321 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
326 /*******************************************************************
328 ********************************************************************/
330 int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf,
331 bool fake_dir_create_times)
335 ret = lstat(fname, &statbuf);
337 /* we always want directories to appear zero size */
338 if (S_ISDIR(statbuf.st_mode)) {
341 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
346 /*******************************************************************
347 An fstatat() wrapper.
348 ********************************************************************/
350 int sys_fstatat(int fd,
351 const char *pathname,
352 SMB_STRUCT_STAT *sbuf,
354 bool fake_dir_create_times)
359 ret = fstatat(fd, pathname, &statbuf, flags);
364 /* we always want directories to appear zero size */
365 if (S_ISDIR(statbuf.st_mode)) {
368 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
372 /*******************************************************************
373 An posix_fallocate() wrapper.
374 ********************************************************************/
375 int sys_posix_fallocate(int fd, off_t offset, off_t len)
377 #if defined(HAVE_POSIX_FALLOCATE)
378 return posix_fallocate(fd, offset, len);
379 #elif defined(F_RESVSP64)
380 /* this handles XFS on IRIX */
382 off_t new_len = offset + len;
386 /* unlikely to get a too large file on a 64bit system but ... */
390 fl.l_whence = SEEK_SET;
394 ret=fcntl(fd, F_RESVSP64, &fl);
399 /* Make sure the file gets enlarged after we allocated space: */
401 if (new_len > sbuf.st_size)
402 ftruncate64(fd, new_len);
409 /*******************************************************************
410 An fallocate() function that matches the semantics of the Linux one.
411 ********************************************************************/
413 #ifdef HAVE_LINUX_FALLOC_H
414 #include <linux/falloc.h>
417 int sys_fallocate(int fd, uint32_t mode, off_t offset, off_t len)
419 #if defined(HAVE_LINUX_FALLOCATE)
422 if (mode & VFS_FALLOCATE_FL_KEEP_SIZE) {
423 lmode |= FALLOC_FL_KEEP_SIZE;
424 mode &= ~VFS_FALLOCATE_FL_KEEP_SIZE;
427 #if defined(HAVE_FALLOC_FL_PUNCH_HOLE)
428 if (mode & VFS_FALLOCATE_FL_PUNCH_HOLE) {
429 lmode |= FALLOC_FL_PUNCH_HOLE;
430 mode &= ~VFS_FALLOCATE_FL_PUNCH_HOLE;
432 #endif /* HAVE_FALLOC_FL_PUNCH_HOLE */
435 DEBUG(2, ("unmapped fallocate flags: %lx\n",
436 (unsigned long)mode));
440 return fallocate(fd, lmode, offset, len);
441 #else /* HAVE_LINUX_FALLOCATE */
442 /* TODO - plumb in fallocate from other filesysetms like VXFS etc. JRA. */
445 #endif /* HAVE_LINUX_FALLOCATE */
448 /*******************************************************************
449 An fdopendir wrapper.
450 ********************************************************************/
452 DIR *sys_fdopendir(int fd)
454 #if defined(HAVE_FDOPENDIR)
455 return fdopendir(fd);
462 /*******************************************************************
464 ********************************************************************/
466 int sys_mknod(const char *path, mode_t mode, SMB_DEV_T dev)
468 #if defined(HAVE_MKNOD)
469 return mknod(path, mode, dev);
471 /* No mknod system call. */
477 /*******************************************************************
479 ********************************************************************/
481 int sys_mknodat(int dirfd, const char *path, mode_t mode, SMB_DEV_T dev)
483 #if defined(HAVE_MKNODAT)
484 return mknodat(dirfd, path, mode, dev);
486 /* No mknod system call. */
492 /*******************************************************************
493 System wrapper for getwd. Always returns MALLOC'ed memory, or NULL
494 on error (malloc fail usually).
495 ********************************************************************/
497 char *sys_getwd(void)
499 #ifdef GETCWD_TAKES_NULL
500 return getcwd(NULL, 0);
501 #elif defined(HAVE_GETCWD)
502 char *wd = NULL, *s = NULL;
503 size_t allocated = PATH_MAX;
506 s = SMB_REALLOC_ARRAY(s, char, allocated);
510 wd = getcwd(s, allocated);
514 if (errno != ERANGE) {
515 int saved_errno = errno;
521 if (allocated < PATH_MAX) {
529 char *s = SMB_MALLOC_ARRAY(char, PATH_MAX);
535 int saved_errno = errno;
543 #if defined(HAVE_POSIX_CAPABILITIES)
545 /**************************************************************************
546 Try and abstract process capabilities (for systems that have them).
547 ****************************************************************************/
549 /* Set the POSIX capabilities needed for the given purpose into the effective
550 * capability set of the current process. Make sure they are always removed
551 * from the inheritable set, because there is no circumstance in which our
552 * children should inherit our elevated privileges.
554 static bool set_process_capability(enum smbd_capability capability,
557 /* "5" is the number of "num_cap_vals++" below */
558 cap_value_t cap_vals[5] = {0};
559 size_t num_cap_vals = 0;
563 #if defined(HAVE_PRCTL) && defined(PR_GET_KEEPCAPS) && defined(PR_SET_KEEPCAPS)
564 /* On Linux, make sure that any capabilities we grab are sticky
565 * across UID changes. We expect that this would allow us to keep both
566 * the effective and permitted capability sets, but as of circa 2.6.16,
567 * only the permitted set is kept. It is a bug (which we work around)
568 * that the effective set is lost, but we still require the effective
571 if (!prctl(PR_GET_KEEPCAPS)) {
572 prctl(PR_SET_KEEPCAPS, 1);
576 cap = cap_get_proc();
578 DEBUG(0,("set_process_capability: cap_get_proc failed: %s\n",
583 switch (capability) {
585 * WARNING: If you add any #ifdef for a fresh
586 * capability, bump up the array size in the
587 * declaration of cap_vals[] above just to be
588 * trivially safe to never overwrite cap_vals[].
590 case KERNEL_OPLOCK_CAPABILITY:
591 #ifdef CAP_NETWORK_MGT
592 /* IRIX has CAP_NETWORK_MGT for oplocks. */
593 cap_vals[num_cap_vals++] = CAP_NETWORK_MGT;
596 case DMAPI_ACCESS_CAPABILITY:
597 #ifdef CAP_DEVICE_MGT
598 /* IRIX has CAP_DEVICE_MGT for DMAPI access. */
599 cap_vals[num_cap_vals++] = CAP_DEVICE_MGT;
601 /* Linux has CAP_MKNOD for DMAPI access. */
602 cap_vals[num_cap_vals++] = CAP_MKNOD;
605 case LEASE_CAPABILITY:
607 cap_vals[num_cap_vals++] = CAP_LEASE;
610 case DAC_OVERRIDE_CAPABILITY:
611 #ifdef CAP_DAC_OVERRIDE
612 cap_vals[num_cap_vals++] = CAP_DAC_OVERRIDE;
616 if (num_cap_vals == 0) {
621 cap_set_flag(cap, CAP_EFFECTIVE, num_cap_vals, cap_vals,
622 enable ? CAP_SET : CAP_CLEAR);
624 /* We never want to pass capabilities down to our children, so make
625 * sure they are not inherited.
627 cap_set_flag(cap, CAP_INHERITABLE, num_cap_vals, cap_vals, CAP_CLEAR);
629 if (cap_set_proc(cap) == -1) {
630 DEBUG(0, ("set_process_capability: cap_set_proc failed: %s\n",
640 #endif /* HAVE_POSIX_CAPABILITIES */
642 /****************************************************************************
643 Gain the oplock capability from the kernel if possible.
644 ****************************************************************************/
646 #if defined(HAVE_POSIX_CAPABILITIES) && defined(CAP_DAC_OVERRIDE)
647 static bool have_cap_dac_override = true;
649 static bool have_cap_dac_override = false;
652 void set_effective_capability(enum smbd_capability capability)
656 if (capability != DAC_OVERRIDE_CAPABILITY || have_cap_dac_override) {
657 #if defined(HAVE_POSIX_CAPABILITIES)
658 ret = set_process_capability(capability, True);
659 #endif /* HAVE_POSIX_CAPABILITIES */
663 * Fallback to become_root() if CAP_DAC_OVERRIDE is not
666 if (capability == DAC_OVERRIDE_CAPABILITY) {
668 have_cap_dac_override = false;
670 if (!have_cap_dac_override) {
676 void drop_effective_capability(enum smbd_capability capability)
678 if (capability != DAC_OVERRIDE_CAPABILITY || have_cap_dac_override) {
679 #if defined(HAVE_POSIX_CAPABILITIES)
680 set_process_capability(capability, False);
681 #endif /* HAVE_POSIX_CAPABILITIES */
687 /**************************************************************************
688 Wrapper for random().
689 ****************************************************************************/
691 long sys_random(void)
693 #if defined(HAVE_RANDOM)
694 return (long)random();
695 #elif defined(HAVE_RAND)
698 DEBUG(0,("Error - no random function available !\n"));
703 /**************************************************************************
704 Wrapper for srandom().
705 ****************************************************************************/
707 void sys_srandom(unsigned int seed)
709 #if defined(HAVE_SRANDOM)
711 #elif defined(HAVE_SRAND)
714 DEBUG(0,("Error - no srandom function available !\n"));
720 #define NGROUPS_MAX 32 /* Guess... */
723 /**************************************************************************
724 Returns equivalent to NGROUPS_MAX - using sysconf if needed.
725 ****************************************************************************/
727 int setgroups_max(void)
729 #if defined(SYSCONF_SC_NGROUPS_MAX)
730 int ret = sysconf(_SC_NGROUPS_MAX);
731 return (ret == -1) ? NGROUPS_MAX : ret;
737 int getgroups_max(void)
739 #if defined(DARWINOS)
741 * On MacOS sysconf(_SC_NGROUPS_MAX) returns 16 due to MacOS's group
742 * nesting. However, The initgroups() manpage states the following:
743 * "Note that OS X supports group membership in an unlimited number
744 * of groups. The OS X kernel uses the group list stored in the process
745 * credentials only as an initial cache. Additional group memberships
746 * are determined by communication between the operating system and the
747 * opendirectoryd daemon."
751 return setgroups_max();
755 /**************************************************************************
756 Wrap setgroups and getgroups for systems that declare getgroups() as
757 returning an array of gid_t, but actually return an array of int.
758 ****************************************************************************/
760 #if defined(HAVE_BROKEN_GETGROUPS)
762 #ifdef HAVE_BROKEN_GETGROUPS
768 static int sys_broken_getgroups(int setlen, gid_t *gidset)
774 return getgroups(0, NULL);
778 * Broken case. We need to allocate a
779 * GID_T array of size setlen.
787 if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
788 DEBUG(0,("sys_getgroups: Malloc fail.\n"));
792 if((ngroups = getgroups(setlen, group_list)) < 0) {
793 int saved_errno = errno;
794 SAFE_FREE(group_list);
800 * We're safe here as if ngroups > setlen then
801 * getgroups *must* return EINVAL.
802 * pubs.opengroup.org/onlinepubs/009695399/functions/getgroups.html
805 for(i = 0; i < ngroups; i++)
806 gidset[i] = (gid_t)group_list[i];
808 SAFE_FREE(group_list);
812 static int sys_broken_setgroups(int setlen, gid_t *gidset)
820 if (setlen < 0 || setlen > setgroups_max()) {
826 * Broken case. We need to allocate a
827 * GID_T array of size setlen.
830 if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
831 DEBUG(0,("sys_setgroups: Malloc fail.\n"));
835 for(i = 0; i < setlen; i++)
836 group_list[i] = (GID_T) gidset[i];
838 if(samba_setgroups(setlen, group_list) != 0) {
839 int saved_errno = errno;
840 SAFE_FREE(group_list);
845 SAFE_FREE(group_list);
849 #endif /* HAVE_BROKEN_GETGROUPS */
851 /* This is a list of systems that require the first GID passed to setgroups(2)
852 * to be the effective GID. If your system is one of these, add it here.
854 #if defined (FREEBSD) || defined (DARWINOS)
855 #define USE_BSD_SETGROUPS
858 #if defined(USE_BSD_SETGROUPS)
859 /* Depending on the particular BSD implementation, the first GID that is
860 * passed to setgroups(2) will either be ignored or will set the credential's
861 * effective GID. In either case, the right thing to do is to guarantee that
862 * gidset[0] is the effective GID.
864 static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
866 gid_t *new_gidset = NULL;
870 /* setgroups(2) will fail with EINVAL if we pass too many groups. */
871 max = setgroups_max();
873 /* No group list, just make sure we are setting the effective GID. */
875 return samba_setgroups(1, &primary_gid);
878 /* If the primary gid is not the first array element, grow the array
879 * and insert it at the front.
881 if (gidset[0] != primary_gid) {
882 new_gidset = SMB_MALLOC_ARRAY(gid_t, setlen + 1);
883 if (new_gidset == NULL) {
887 memcpy(new_gidset + 1, gidset, (setlen * sizeof(gid_t)));
888 new_gidset[0] = primary_gid;
893 DEBUG(3, ("forced to truncate group list from %d to %d\n",
898 #if defined(HAVE_BROKEN_GETGROUPS)
899 ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
901 ret = samba_setgroups(setlen, new_gidset ? new_gidset : gidset);
906 SAFE_FREE(new_gidset);
913 #endif /* USE_BSD_SETGROUPS */
915 /**************************************************************************
916 Wrapper for getgroups. Deals with broken (int) case.
917 ****************************************************************************/
919 int sys_getgroups(int setlen, gid_t *gidset)
921 #if defined(HAVE_BROKEN_GETGROUPS)
922 return sys_broken_getgroups(setlen, gidset);
924 return getgroups(setlen, gidset);
928 /**************************************************************************
929 Wrapper for setgroups. Deals with broken (int) case and BSD case.
930 ****************************************************************************/
932 int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
934 #if !defined(HAVE_SETGROUPS)
937 #endif /* HAVE_SETGROUPS */
939 #if defined(USE_BSD_SETGROUPS)
940 return sys_bsd_setgroups(primary_gid, setlen, gidset);
941 #elif defined(HAVE_BROKEN_GETGROUPS)
942 return sys_broken_setgroups(setlen, gidset);
944 return samba_setgroups(setlen, gidset);
948 /****************************************************************************
949 Return the major devicenumber for UNIX extensions.
950 ****************************************************************************/
952 uint32_t unix_dev_major(SMB_DEV_T dev)
954 #if defined(HAVE_DEVICE_MAJOR_FN)
955 return (uint32_t)major(dev);
957 return (uint32_t)(dev >> 8);
961 /****************************************************************************
962 Return the minor devicenumber for UNIX extensions.
963 ****************************************************************************/
965 uint32_t unix_dev_minor(SMB_DEV_T dev)
967 #if defined(HAVE_DEVICE_MINOR_FN)
968 return (uint32_t)minor(dev);
970 return (uint32_t)(dev & 0xff);
974 /**************************************************************************
975 Wrapper for realpath.
976 ****************************************************************************/
978 char *sys_realpath(const char *path)
982 #ifdef REALPATH_TAKES_NULL
983 result = realpath(path, NULL);
985 result = SMB_MALLOC_ARRAY(char, PATH_MAX + 1);
987 char *resolved_path = realpath(path, result);
988 if (!resolved_path) {
991 /* SMB_ASSERT(result == resolved_path) ? */
992 result = resolved_path;
1000 /*******************************************************************
1001 Return the number of CPUs.
1002 ********************************************************************/
1004 int sys_get_number_of_cores(void)
1008 #if defined(HAVE_SYSCONF)
1009 #if defined(_SC_NPROCESSORS_ONLN)
1010 ret = (int)sysconf(_SC_NPROCESSORS_ONLN);
1012 #if defined(_SC_NPROCESSORS_CONF)
1014 ret = (int)sysconf(_SC_NPROCESSORS_CONF);
1017 #elif defined(HAVE_SYSCTL) && defined(CTL_HW)
1019 unsigned int len = sizeof(ret);
1022 #if defined(HW_AVAILCPU)
1023 name[1] = HW_AVAILCPU;
1025 if (sysctl(name, 2, &ret, &len, NULL, 0) == -1) {
1029 #if defined(HW_NCPU)
1033 if (sysctl(nm, 2, &count, &len, NULL, 0) == -1) {
1046 static struct proc_fd_pattern {
1047 const char *pattern;
1048 const char *test_path;
1049 } proc_fd_patterns[] = {
1051 { "/proc/self/fd/%d", "/proc/self/fd/0" },
1055 static const char *proc_fd_pattern;
1057 bool sys_have_proc_fds(void)
1059 static bool checked;
1060 static bool have_proc_fds;
1061 struct proc_fd_pattern *p = NULL;
1066 return have_proc_fds;
1069 for (p = &proc_fd_patterns[0]; p->test_path != NULL; p++) {
1070 ret = stat(p->test_path, &sb);
1074 have_proc_fds = true;
1075 proc_fd_pattern = p->pattern;
1080 return have_proc_fds;
1083 const char *sys_proc_fd_path(int fd, char *buf, size_t bufsize)
1087 if (!sys_have_proc_fds()) {
1091 #if defined(__clang__)
1092 #pragma clang diagnostic push
1093 #pragma clang diagnostic ignored "-Wformat-nonliteral"
1095 written = snprintf(buf,
1099 #if defined(__clang__)
1100 #pragma clang diagnostic pop
1102 if (written >= bufsize) {