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See ChangeLog: Fri Nov 27 21:37:41 CET 1998 Werner Koch

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Werner Koch 1998-11-27 20:40:56 +00:00
parent d87a3c14c4
commit df1326eb05
11 changed files with 238 additions and 59 deletions
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4
util/ChangeLog
View file

@ -1,3 +1,7 @@
Fri Nov 27 21:37:41 CET 1998 Werner Koch <wk@isil.d.shuttle.de>
* dotlock.c: Implemented
Wed Nov 25 11:30:07 1998 Werner Koch (wk@isil.d.shuttle.de)
* iobuf.c (iobuf_pop_filter): Fixed sigsegv after error.

139
util/dotlock.c
View file

@ -23,14 +23,20 @@
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "types.h"
#include "util.h"
#include "memory.h"
static int read_lockfile( const char *name );
#if 0
/****************
* Create a lockfile with the given name. A TIMEOUT of 0
* returns immediately, -1 waits forever (hopefully not), other
@ -40,67 +46,122 @@
*
* Notes: This function creates a lock file in the same directory
* as file_to_lock with the name "file_to_lock.lock"
* A temporary file ".#lk.<pid>.<hostname> is used.
* A temporary file ".#lk.<hostname>.pid[.threadid] is used.
* This function does nothing for Windoze.
*/
const char *
make_dotlock( const char *file_to_lock, long timeout )
{
int rc=-1, fd=-1, pid;
int fd=-1, pid;
char pidstr[16];
const char *handle = NULL;
char *lockname = NULL;
char *tname = NULL;
char *p;
int have_tfile = 0;
struct utsname uts;
const char *dirpart;
int dirpartlen;
log_debug("dotlock_make: lock='%s'\n", lockfile );
sprintf( pidstr, "%10d\n", getpid() );
/* add the hostname to the second line (FQDN or IP addr?) */
/* fixme: add the hostname to the second line (FQDN or IP addr?) */
/* create a temporary file */
tname = CreateTmpFile2( p, ".#lk" );
free(p);
if( !tname )
log_fatal( "could not create temporary lock file '%s'\n");
log_debug( "dotlock_make: tmpname='%s'\n", tname );
chmod( tname, 0644 ); /* just in case an umask is set */
if( !(fd = open( tname, O_WRONLY )) )
log_fatal( "could not open temporary lock file '%s'\n", tname);
if( write(fd, pidstr, 11 ) != 11 )
log_fatal( "error writing to temporary lock file '%s'\n", tname);
#if SYS_NMLN < 8
#error Aiiih
#endif
if( uname( &uts ) )
strcpy( uts.nodename, "unknown" );
if( !(dirpart = strrchr( file_to_lock, '/' )) ) {
dirpart = ".";
dirpartlen = 1;
}
else {
dirpartlen = dirpart - file_to_lock;
dirpart = file_to_lock;
}
#ifdef _THREAD_SAFE
tname = m_alloc( dirpartlen + 6 + strlen(uts.nodename) + 11+ 20 );
sprintf( tname, "%.*s/.#lk.%s.%d.%p",
dirpartlen, dirpart, uts.nodename, getpid(), &pid );
#else
tname = m_alloc( dirpartlen + 6 + strlen(uts.nodename) + 11 );
sprintf( tname, "%.*s/.#lk.%s.%d",
dirpartlen, dirpart, uts.nodename, getpid() );
#endif
do {
errno = 0;
fd = open( tname, O_WRONLY|O_CREAT|O_EXCL,
S_IRUSR|S_IRGRP|S_IROTH|S_IWUSR );
} while( fd == -1 && errno == EINTR );
if( fd == -1 ) {
log_error( "failed to create temporary file '%s': %s\n",
tname, strerror(errno));
goto leave;
}
have_tfile = 1;
if( write(fd, pidstr, 11 ) != 11 ) {
log_fatal( "error writing to '%s': %s\n", tname, strerror(errno) );
goto leave;
}
if( close(fd) ) {
log_fatal( "error closing '%s'\n", tname);
log_error( "error closing '%s': %s\n", tname, strerror(errno));
goto leave;
}
fd = -1;
lockname = m_alloc( strlen(file_to_lock) + 6 );
strcpy(stpcpy(lockname, file_to_lock), ".lock");
retry:
if( !link(tname, lockfile) )
rc = 0; /* okay */
else if( errno != EEXIST )
log_error( "lock not made: link() failed: %s\n", strerror(errno) );
else { /* lock file already there */
if( (pid = read_lockfile(lockfile)) == -1 ) {
if( !link(tname, lockname) ) {/* fixme: better use stat to check the link count */
handle = lockname;
lockname = NULL;
}
else if( errno == EEXIST ) {
if( (pid = read_lockfile(lockname)) == -1 ) {
if( errno == ENOENT ) {
log_debug( "lockfile disappeared\n");
log_info( "lockfile disappeared\n");
goto retry;
}
log_debug("cannot read lockfile\n");
log_info("cannot read lockfile\n");
}
else if( pid == getpid() ) {
log_info( "Oops: lock already hold by us\n");
rc = 0; /* okay */
handle = lockname;
lockname = NULL;
}
#if 0 /* we should not do this without checking the permissions */
/* and the hostname */
else if( kill(pid, 0) && errno == ESRCH ) {
log_info( "removing stale lockfile (created by %d)", (int)pid );
remove( lockfile );
log_info( "removing stale lockfile (created by %d)", pid );
remove( lockname );
goto retry;
}
log_debug( "lock not made: lock file exists\n" );
#endif
if( timeout == -1 ) {
struct timeval tv;
log_info( "waiting for lock (hold by %d) ...\n", pid );
/* can't use sleep, cause signals may be blocked */
tv.tv_sec = 1;
tv.tv_usec = 0;
select(0, NULL, NULL, NULL, &tv);
goto retry;
}
/* fixme: implement timeouts */
}
else
log_error( "lock not made: link() failed: %s\n", strerror(errno) );
if( tname ) {
leave:
if( fd != -1 )
close(fd);
if( have_tfile )
remove(tname);
free(tname);
}
if( !rc )
log_debug( "lock made\n");
return rc;
m_free(tname);
m_free(lockname);
return handle;
}
/****************
@ -140,7 +201,7 @@ release_dotlock( const char *lockfile )
lockfile);
return -1;
}
log_debug( "release_dotlock: released lockfile '%s'", lockfile);
m_free( (char*)lockfile );
return 0;
}
@ -156,7 +217,7 @@ read_lockfile( const char *name )
if( (fd = open(name, O_RDONLY)) == -1 ) {
int e = errno;
log_debug("error opening lockfile '%s'", name );
log_debug("error opening lockfile '%s': %s\n", name, strerror(errno) );
errno = e;
return -1;
}
@ -175,4 +236,4 @@ read_lockfile( const char *name )
}
return pid;
}
#endif