diff options
Diffstat (limited to 'libpthread/nptl/sem_open.c')
| -rw-r--r-- | libpthread/nptl/sem_open.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/libpthread/nptl/sem_open.c b/libpthread/nptl/sem_open.c new file mode 100644 index 000000000..a4b2f5b3a --- /dev/null +++ b/libpthread/nptl/sem_open.c @@ -0,0 +1,404 @@ +/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <fcntl.h> +#include <mntent.h> +#include <paths.h> +#include <pthread.h> +#include <search.h> +#include <semaphore.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/statfs.h> +#include <linux_fsinfo.h> +#include "semaphoreP.h" + + + +/* Information about the mount point. */ +struct mountpoint_info mountpoint attribute_hidden; + +/* This is the default mount point. */ +static const char defaultmount[] = "/dev/shm"; +/* This is the default directory. */ +static const char defaultdir[] = "/dev/shm/sem."; + +/* Protect the `mountpoint' variable above. */ +pthread_once_t __namedsem_once attribute_hidden = PTHREAD_ONCE_INIT; + + +/* Determine where the shmfs is mounted (if at all). */ +void +attribute_hidden +__where_is_shmfs (void) +{ + char buf[512]; + struct statfs f; + struct mntent resmem; + struct mntent *mp; + FILE *fp; + + /* The canonical place is /dev/shm. This is at least what the + documentation tells everybody to do. */ + if (__statfs (defaultmount, &f) == 0 && f.f_type == SHMFS_SUPER_MAGIC) + { + /* It is in the normal place. */ + mountpoint.dir = (char *) defaultdir; + mountpoint.dirlen = sizeof (defaultdir) - 1; + + return; + } + + /* OK, do it the hard way. Look through the /proc/mounts file and if + this does not exist through /etc/fstab to find the mount point. */ + fp = __setmntent ("/proc/mounts", "r"); + if (__builtin_expect (fp == NULL, 0)) + { + fp = __setmntent (_PATH_MNTTAB, "r"); + if (__builtin_expect (fp == NULL, 0)) + /* There is nothing we can do. Blind guesses are not helpful. */ + return; + } + + /* Now read the entries. */ + while ((mp = __getmntent_r (fp, &resmem, buf, sizeof buf)) != NULL) + /* The original name is "shm" but this got changed in early Linux + 2.4.x to "tmpfs". */ + if (strcmp (mp->mnt_type, "tmpfs") == 0 + || strcmp (mp->mnt_type, "shm") == 0) + { + /* Found it. There might be more than one place where the + filesystem is mounted but one is enough for us. */ + size_t namelen; + + /* First make sure this really is the correct entry. At least + some versions of the kernel give wrong information because + of the implicit mount of the shmfs for SysV IPC. */ + if (__statfs (mp->mnt_dir, &f) != 0 || f.f_type != SHMFS_SUPER_MAGIC) + continue; + + namelen = strlen (mp->mnt_dir); + + if (namelen == 0) + /* Hum, maybe some crippled entry. Keep on searching. */ + continue; + + mountpoint.dir = (char *) malloc (namelen + 4 + 2); + if (mountpoint.dir != NULL) + { + char *cp = __mempcpy (mountpoint.dir, mp->mnt_dir, namelen); + if (cp[-1] != '/') + *cp++ = '/'; + cp = stpcpy (cp, "sem."); + mountpoint.dirlen = cp - mountpoint.dir; + } + + break; + } + + /* Close the stream. */ + __endmntent (fp); +} + + +/* Comparison function for search of existing mapping. */ +int +attribute_hidden +__sem_search (const void *a, const void *b) +{ + const struct inuse_sem *as = (const struct inuse_sem *) a; + const struct inuse_sem *bs = (const struct inuse_sem *) b; + + if (as->ino != bs->ino) + /* Cannot return the difference the type is larger than int. */ + return as->ino < bs->ino ? -1 : (as->ino == bs->ino ? 0 : 1); + + if (as->dev != bs->dev) + /* Cannot return the difference the type is larger than int. */ + return as->dev < bs->dev ? -1 : (as->dev == bs->dev ? 0 : 1); + + return strcmp (as->name, bs->name); +} + + +/* The search tree for existing mappings. */ +void *__sem_mappings attribute_hidden; + +/* Lock to protect the search tree. */ +lll_lock_t __sem_mappings_lock = LLL_LOCK_INITIALIZER; + + +/* Search for existing mapping and if possible add the one provided. */ +static sem_t * +check_add_mapping (const char *name, size_t namelen, int fd, sem_t *existing) +{ + sem_t *result = SEM_FAILED; + + /* Get the information about the file. */ + struct stat64 st; + if (__fxstat64 (_STAT_VER, fd, &st) == 0) + { + /* Get the lock. */ + lll_lock (__sem_mappings_lock); + + /* Search for an existing mapping given the information we have. */ + struct inuse_sem *fake; + fake = (struct inuse_sem *) alloca (sizeof (*fake) + namelen); + memcpy (fake->name, name, namelen); + fake->dev = st.st_dev; + fake->ino = st.st_ino; + + struct inuse_sem **foundp = tfind (fake, &__sem_mappings, __sem_search); + if (foundp != NULL) + { + /* There is already a mapping. Use it. */ + result = (*foundp)->sem; + ++(*foundp)->refcnt; + } + else + { + /* We haven't found a mapping. Install ione. */ + struct inuse_sem *newp; + + newp = (struct inuse_sem *) malloc (sizeof (*newp) + namelen); + if (newp != NULL) + { + /* If the caller hasn't provided any map it now. */ + if (existing == SEM_FAILED) + existing = (sem_t *) mmap (NULL, sizeof (sem_t), + PROT_READ | PROT_WRITE, MAP_SHARED, + fd, 0); + + newp->dev = st.st_dev; + newp->ino = st.st_ino; + newp->refcnt = 1; + newp->sem = existing; + memcpy (newp->name, name, namelen); + + /* Insert the new value. */ + if (existing != MAP_FAILED + && tsearch (newp, &__sem_mappings, __sem_search) != NULL) + /* Successful. */ + result = existing; + else + /* Something went wrong while inserting the new + value. We fail completely. */ + free (newp); + } + } + + /* Release the lock. */ + lll_unlock (__sem_mappings_lock); + } + + if (result != existing && existing != SEM_FAILED && existing != MAP_FAILED) + { + /* Do not disturb errno. */ + INTERNAL_SYSCALL_DECL (err); + INTERNAL_SYSCALL (munmap, err, 2, existing, sizeof (sem_t)); + } + + return result; +} + + +sem_t * +sem_open (const char *name, int oflag, ...) +{ + char *finalname; + sem_t *result = SEM_FAILED; + int fd; + + /* Determine where the shmfs is mounted. */ + INTUSE(__pthread_once) (&__namedsem_once, __where_is_shmfs); + + /* If we don't know the mount points there is nothing we can do. Ever. */ + if (mountpoint.dir == NULL) + { + __set_errno (ENOSYS); + return SEM_FAILED; + } + + /* Construct the filename. */ + while (name[0] == '/') + ++name; + + if (name[0] == '\0') + { + /* The name "/" is not supported. */ + __set_errno (EINVAL); + return SEM_FAILED; + } + size_t namelen = strlen (name) + 1; + + /* Create the name of the final file. */ + finalname = (char *) alloca (mountpoint.dirlen + namelen); + __mempcpy (__mempcpy (finalname, mountpoint.dir, mountpoint.dirlen), + name, namelen); + + /* If the semaphore object has to exist simply open it. */ + if ((oflag & O_CREAT) == 0 || (oflag & O_EXCL) == 0) + { + try_again: + fd = __libc_open (finalname, + (oflag & ~(O_CREAT|O_ACCMODE)) | O_NOFOLLOW | O_RDWR); + + if (fd == -1) + { + /* If we are supposed to create the file try this next. */ + if ((oflag & O_CREAT) != 0 && errno == ENOENT) + goto try_create; + + /* Return. errno is already set. */ + } + else + /* Check whether we already have this semaphore mapped and + create one if necessary. */ + result = check_add_mapping (name, namelen, fd, SEM_FAILED); + } + else + { + /* We have to open a temporary file first since it must have the + correct form before we can start using it. */ + char *tmpfname; + mode_t mode; + unsigned int value; + va_list ap; + + try_create: + va_start (ap, oflag); + + mode = va_arg (ap, mode_t); + value = va_arg (ap, unsigned int); + + va_end (ap); + + if (value > SEM_VALUE_MAX) + { + __set_errno (EINVAL); + return SEM_FAILED; + } + + /* Create the initial file content. */ + sem_t initsem; + + struct sem *iinitsem = (struct sem *) &initsem; + iinitsem->count = value; + + /* Initialize the remaining bytes as well. */ + memset ((char *) &initsem + sizeof (struct sem), '\0', + sizeof (sem_t) - sizeof (struct sem)); + + tmpfname = (char *) alloca (mountpoint.dirlen + 6 + 1); + char *xxxxxx = __mempcpy (tmpfname, mountpoint.dir, mountpoint.dirlen); + + int retries = 0; +#define NRETRIES 50 + while (1) + { + /* Add the suffix for mktemp. */ + strcpy (xxxxxx, "XXXXXX"); + + /* We really want to use mktemp here. We cannot use mkstemp + since the file must be opened with a specific mode. The + mode cannot later be set since then we cannot apply the + file create mask. */ + if (mktemp (tmpfname) == NULL) + return SEM_FAILED; + + /* Open the file. Make sure we do not overwrite anything. */ + fd = __libc_open (tmpfname, O_RDWR | O_CREAT | O_EXCL, mode); + if (fd == -1) + { + if (errno == EEXIST) + { + if (++retries < NRETRIES) + continue; + + __set_errno (EAGAIN); + } + + return SEM_FAILED; + } + + /* We got a file. */ + break; + } + + if (TEMP_FAILURE_RETRY (__libc_write (fd, &initsem, sizeof (sem_t))) + == sizeof (sem_t) + /* Map the sem_t structure from the file. */ + && (result = (sem_t *) mmap (NULL, sizeof (sem_t), + PROT_READ | PROT_WRITE, MAP_SHARED, + fd, 0)) != MAP_FAILED) + { + /* Create the file. Don't overwrite an existing file. */ + if (link (tmpfname, finalname) != 0) + { + /* Undo the mapping. */ + (void) munmap (result, sizeof (sem_t)); + + /* Reinitialize 'result'. */ + result = SEM_FAILED; + + /* This failed. If O_EXCL is not set and the problem was + that the file exists, try again. */ + if ((oflag & O_EXCL) == 0 && errno == EEXIST) + { + /* Remove the file. */ + (void) unlink (tmpfname); + + /* Close the file. */ + (void) __libc_close (fd); + + goto try_again; + } + } + else + /* Insert the mapping into the search tree. This also + determines whether another thread sneaked by and already + added such a mapping despite the fact that we created it. */ + result = check_add_mapping (name, namelen, fd, result); + } + + /* Now remove the temporary name. This should never fail. If + it fails we leak a file name. Better fix the kernel. */ + (void) unlink (tmpfname); + } + + /* Map the mmap error to the error we need. */ + if (MAP_FAILED != (void *) SEM_FAILED && result == MAP_FAILED) + result = SEM_FAILED; + + /* We don't need the file descriptor anymore. */ + if (fd != -1) + { + /* Do not disturb errno. */ + INTERNAL_SYSCALL_DECL (err); + INTERNAL_SYSCALL (close, err, 1, fd); + } + + return result; +} |