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authorRoland McGrath <roland@gnu.org>1996-07-18 08:43:26 +0000
committerRoland McGrath <roland@gnu.org>1996-07-18 08:43:26 +0000
commit49b986270035c7f86c3dc85383fd1da2e413fef9 (patch)
tree5b1236203c804457e180793a67e3e0e4b489a3d8 /login
parentd7bca0d30b5d3c8ae8421a1994ba24b1b56370d7 (diff)
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Thu Jul 18 04:33:21 1996 Roland McGrath <roland@baalperazim.frob.com>cvs/libc-960718
* sysdeps/mach/hurd/errnos.awk: Move EWOULDBLOCK check before errno==0 check. mib's clueless hacking broke it. Thu Jul 18 04:27:21 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * Makerules ($(libdir)/libc.so): Add missing / after $(cryptobjdir). Wed Jul 17 10:54:20 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/start.S: Move to ... * sysdeps/alpha/elf/start.S: here. * misc/sys/ustat.h: New file. * misc/ustat.h: Ditto. * sysdeps/generic/ustatbits.h: Ditto. * libc-orig/sysdeps/stub/ustat.c: Ditto. * sysdeps/unix/sysv/linux/ustatbits.h: Ditto. * misc/Makefile (headers): Mention ustat.h, sys/ustat.h, and ustatbits.h. (routines): Mention ustat. * sysdeps/unix/sysv/linux/syscalls.list: Mention klogctl in alphabetically correct place. Mention ustat. * sysdeps/unix/alpha/sysdep.S: Make errno a bss symbol, not a common symbol (makes errno accessible from gdb). * login/pututline_r.c (pututline_r): Test ut_id in repositioning test, not ut_type. * login/logwtmp.c (logwtmp): Reimplemented. Must ensure that a record always gets appended at end of file (wtmp is a log file, after all). Set ut_type to DEAD_PROCESS if name is empty. * login/getutid_r.c (getutid_r): Handle search for UT_TYPE in separate loop from search for UT_ID. Fix code so it is in sync with Unix man page. * login/getutline_r.c (getutline_r): Stop searching only if ut_line matches and type is either USER_PROCESS or LOGIN_PROCESS. Tue Jul 16 15:06:18 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/netinet/in.h: Base on <linux/in.h> to avoid duplicate declarations. Sun Jul 14 19:08:55 1996 David Mosberger-Tang <davidm@azstarnet.com> * manual/maint.texi (Supported Configurations): Add alpha-gnu-linux and alpha-gnu-linuxecoff targets. Fri Jul 12 16:58:44 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/netinet/in.h: Declare bindresvport(). Sat Jun 22 23:30:07 1996 David Mosberger-Tang <davidm@azstarnet.com> * resolv/res_send.c (res_send): Declare FROMLEN as size_t instead of int. * resolv/res_comp.c (res_hnok): Use empty statement in place of NULL (which generates a "useless expression" warning in gcc).
Diffstat (limited to 'login')
-rw-r--r--login/getutid_r.c67
-rw-r--r--login/getutline_r.c22
-rw-r--r--login/logwtmp.c62
-rw-r--r--login/pututline_r.c17
4 files changed, 104 insertions, 64 deletions
diff --git a/login/getutid_r.c b/login/getutid_r.c
index 02013c2..347bbf3 100644
--- a/login/getutid_r.c
+++ b/login/getutid_r.c
@@ -53,32 +53,55 @@ getutid_r (const struct utmp *id, struct utmp **utmp,
if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1)
return -1;
- while (1)
+ if (id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
+ || id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
{
- /* Read the next entry. */
- if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
- != sizeof (struct utmp))
+ /* Search for next entry with type RUN_LVL, BOOT_TIME,
+ OLD_TIME, or NEW_TIME. */
+
+ while (1)
{
- errno = ESRCH;
- return -1;
+ /* Read the next entry. */
+ if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
+ != sizeof (struct utmp))
+ {
+ errno = ESRCH;
+ return -1;
+ }
+
+ /* Update position pointer. */
+ utmp_data->loc_utmp += sizeof (struct utmp);
+
+ if (id->ut_type == utmp_data->ubuf.ut_type)
+ break;
}
+ }
+ else
+ {
+ /* Search for the next entry with the specified ID and with type
+ INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
- /* Update position pointer. */
- utmp_data->loc_utmp += sizeof (struct utmp);
-
- if ((id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
- || id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
- && id->ut_type != utmp_data->ubuf.ut_type)
- /* Stop at the next entry with type RUN_LVL, BOOT_TIME,
- OLD_TIME, or NEW_TIME. */
- break;
-
- if ((id->ut_type == INIT_PROCESS || id->ut_type == LOGIN_PROCESS
- || id->ut_type == USER_PROCESS || id->ut_type == DEAD_PROCESS)
- && strncmp (id->ut_id, utmp_data->ubuf.ut_id, sizeof id->ut_id) == 0)
- /* Stop at the next entry with the specified ID and with type
- INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
- break;
+ while (1)
+ {
+ /* Read the next entry. */
+ if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))
+ != sizeof (struct utmp))
+ {
+ errno = ESRCH;
+ return -1;
+ }
+
+ /* Update position pointer. */
+ utmp_data->loc_utmp += sizeof (struct utmp);
+
+ if (( utmp_data->ubuf.ut_type == INIT_PROCESS
+ || utmp_data->ubuf.ut_type == LOGIN_PROCESS
+ || utmp_data->ubuf.ut_type == USER_PROCESS
+ || utmp_data->ubuf.ut_type == DEAD_PROCESS)
+ && (strncmp (utmp_data->ubuf.ut_id, id->ut_id, sizeof id->ut_id)
+ == 0))
+ break;
+ }
}
*utmp = &utmp_data->ubuf;
diff --git a/login/getutline_r.c b/login/getutline_r.c
index 965d46c..4d35471 100644
--- a/login/getutline_r.c
+++ b/login/getutline_r.c
@@ -55,22 +55,16 @@ getutline_r (const struct utmp *line, struct utmp **utmp,
/* Update position pointer. */
utmp_data->loc_utmp += sizeof (struct utmp);
+ if (
#if _HAVE_UT_TYPE - 0
- if (utmp_data->ubuf.ut_type == USER_PROCESS
- && strncmp (line->ut_line, utmp_data->ubuf.ut_line,
- sizeof line->ut_line) == 0)
- /* Stop if we found an user entry. */
- break;
-
- if (utmp_data->ubuf.ut_type == LOGIN_PROCESS)
- /* Stop if we found a login entry. */
- break;
-#else /* !_HAVE_UT_TYPE */
- if (strncmp (line->ut_line, utmp_data->ubuf.ut_line,
- sizeof line->ut_line) == 0)
- /* Stop if the line match. */
- break;
+ (utmp_data->ubuf.ut_type == USER_PROCESS
+ || utmp_data->ubuf.ut_type == LOGIN_PROCESS)
+ &&
#endif
+ ! strncmp (line->ut_line, utmp_data->ubuf.ut_line,
+ sizeof line->ut_line))
+ /* Stop if we found a user or login entry. */
+ break;
}
*utmp = &utmp_data->ubuf;
diff --git a/login/logwtmp.c b/login/logwtmp.c
index 371f34e..2ae6a68 100644
--- a/login/logwtmp.c
+++ b/login/logwtmp.c
@@ -17,33 +17,31 @@ License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
+#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
-
+#include <sys/file.h>
+#include <sys/stat.h>
void
logwtmp (const char *line, const char *name, const char *host)
{
- struct utmp_data data;
struct utmp ut;
+ struct stat st;
+ size_t written;
+ int fd;
- /* Tell that we want to use the UTMP file. */
- if (utmpname (_PATH_WTMP) == 0)
- return;
-
- /* Open UTMP file. */
- setutent_r (&data);
-
- /* Position at end of file. */
- data.loc_utmp = lseek (data.ut_fd, 0, SEEK_END);
- if (data.loc_utmp == -1)
- return;
+ /* Open WTMP file. */
+ fd = __open (_PATH_WTMP, O_WRONLY | O_APPEND);
+ if (fd < 0)
+ return;
/* Set information in new entry. */
- bzero (&ut, sizeof (ut));
+ memset (&ut, 0, sizeof (ut));
+ ut.ut_pid = getpid ();
#if _HAVE_UT_TYPE - 0
- ut.ut_type = USER_PROCESS;
+ ut.ut_type = name[0] ? USER_PROCESS : DEAD_PROCESS;
#endif
strncpy (ut.ut_line, line, sizeof ut.ut_line);
strncpy (ut.ut_name, name, sizeof ut.ut_name);
@@ -52,14 +50,36 @@ logwtmp (const char *line, const char *name, const char *host)
#endif
#if _HAVE_UT_TV - 0
- gettimeofday (&ut.ut_tv, NULL);
+ __gettimeofday (&ut.ut_tv, NULL);
#else
- time (&ut.ut_time);
+ __time (&ut.ut_time);
#endif
- /* Write the entry. */
- pututline_r (&ut, &data);
+ /* Try to lock the file. */
+ if (__flock (fd, LOCK_EX | LOCK_NB) < 0 && errno != ENOSYS)
+ {
+ /* Oh, oh. The file is already locked. Wait a bit and try again. */
+ sleep (1);
+
+ /* This time we ignore the error. */
+ __flock (fd, LOCK_EX | LOCK_NB);
+ }
+
+ /* Remeber original size of log file: */
+ if (__fstat (fd, &st) < 0)
+ goto done;
+
+ /* Write the entry. If we can't write all the bytes, reset the file
+ size back to the original size. That way, no partial entries
+ will remain. */
+ written = __write (fd, &ut, sizeof (ut));
+ if (written > 0 && written != sizeof (ut))
+ ftruncate (fd, st.st_size);
+
+done:
+ /* And unlock the file. */
+ __flock (fd, LOCK_UN);
- /* Close UTMP file. */
- endutent_r (&data);
+ /* Close WTMP file. */
+ __close (fd);
}
diff --git a/login/pututline_r.c b/login/pututline_r.c
index 4c9a91f..42994e8 100644
--- a/login/pututline_r.c
+++ b/login/pututline_r.c
@@ -58,12 +58,15 @@ pututline_r (const struct utmp *id, struct utmp_data *utmp_data)
return -1;
}
-#if _HAVE_UT_TYPE - 0
- /* Seek position to write. */
- if (utmp_data->loc_utmp >= sizeof (struct utmp)
- && utmp_data->ubuf.ut_type != id->ut_type)
+#if _HAVE_UT_ID - 0
+ /* Check whether we need to reposition. Repositioning is necessary
+ either if the data in UTMP_DATA is not valid or if the ids don't
+ match: */
+ if (utmp_data->loc_utmp < (off_t) sizeof (struct utmp)
+ || strncmp(utmp_data->ubuf.ut_id, id->ut_id, sizeof (id->ut_id)) != 0)
{
- /* We must not overwrite the data in UTMP_DATA. */
+ /* We must not overwrite the data in UTMP_DATA since ID may be
+ aliasing it. */
struct utmp_data *data_tmp = alloca (sizeof (*data_tmp));
struct utmp *dummy;
@@ -77,7 +80,7 @@ pututline_r (const struct utmp *id, struct utmp_data *utmp_data)
pointer now is at the end of the file. */
return -1;
- /* Set position pointer to position after adding of the record. */
+ /* Set position pointer to position behind the record. */
utmp_data->loc_utmp += sizeof (struct utmp);
}
}
@@ -98,7 +101,7 @@ pututline_r (const struct utmp *id, struct utmp_data *utmp_data)
if (result >= 0)
/* Position file correctly. */
- if (utmp_data->loc_utmp < sizeof (struct utmp))
+ if (utmp_data->loc_utmp < (off_t) sizeof (struct utmp))
/* Not located at any valid entry. Add at the end. */
{
result = lseek (utmp_data->ut_fd, 0L, SEEK_END);