emo/shadow
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity

[svn-upgrade] Integrating new upstream version, shadow (4.0.12)

Browse Source
This commit is contained in:
nekral-guest
2007-10-07 11:46:52 +00:00
parent 1de90a599c
commit e89f3546f2
192 changed files with 8828 additions and 17220 deletions
Download Patch File Download Diff File Expand all files Collapse all files

99
src/newgrp.c
View File

@@ -30,7 +30,7 @@
#include <config.h>
#include "rcsid.h"
RCSID (PKG_VER "$Id: newgrp.c,v 1.34 2005/07/08 17:58:55 kloczek Exp $")
RCSID (PKG_VER "$Id: newgrp.c,v 1.35 2005/08/11 11:26:11 kloczek Exp $")
#include <stdio.h>
#include <errno.h>
#include <grp.h>
@@ -440,58 +440,55 @@ int main (int argc, char **argv)
"user `%s' (login `%s' on %s) switched to group `%s'",
name, loginname, tty, group));
#ifdef USE_PAM
if (getdef_bool ("CLOSE_SESSIONS")) {
/*
* We want to fork and exec the new shell in the child, leaving the
* parent waiting to log the session close.
*
* The parent must ignore signals generated from the console
* (SIGINT, SIGQUIT, SIGHUP) which might make the parent terminate
* before its child. When bash is exec'ed as the subshell, it
* generates a new process group id for itself, and consequently
* only SIGHUP, which is sent to all process groups in the session,
* can reach the parent. However, since arbitrary programs can be
* specified as login shells, there is no such guarantee in general.
* For the same reason, we must also ignore stop signals generated
* from the console (SIGTSTP, SIGTTIN, and SIGTTOU) in order to
* avoid any possibility of the parent being stopped when it
* receives SIGCHLD from the terminating subshell. -- JWP
*/
pid_t child, pid;
/*
* We want to fork and exec the new shell in the child, leaving the
* parent waiting to log the session close.
*
* The parent must ignore signals generated from the console
* (SIGINT, SIGQUIT, SIGHUP) which might make the parent terminate
* before its child. When bash is exec'ed as the subshell, it
* generates a new process group id for itself, and consequently
* only SIGHUP, which is sent to all process groups in the session,
* can reach the parent. However, since arbitrary programs can be
* specified as login shells, there is no such guarantee in general.
* For the same reason, we must also ignore stop signals generated
* from the console (SIGTSTP, SIGTTIN, and SIGTTOU) in order to
* avoid any possibility of the parent being stopped when it
* receives SIGCHLD from the terminating subshell. -- JWP
*/
pid_t child, pid;
signal (SIGINT, SIG_IGN);
signal (SIGQUIT, SIG_IGN);
signal (SIGHUP, SIG_IGN);
signal (SIGTSTP, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
signal (SIGTTOU, SIG_IGN);
child = fork ();
if (child < 0) {
/* error in fork() */
fprintf (stderr, "%s: failure forking: %s",
is_newgrp ? "newgrp" : "sg",
strerror (errno));
exit (1);
} else if (child) {
/* parent - wait for child to finish, then log session close */
do {
pid = waitpid (child, NULL, 0);
} while (pid != child);
SYSLOG ((LOG_INFO,
"user `%s' (login `%s' on %s) returned to group `%s'",
name, loginname, tty,
getgrgid (gid)->gr_name));
closelog ();
exit (0);
}
/* child - restore signals to their default state */
signal (SIGINT, SIG_DFL);
signal (SIGQUIT, SIG_DFL);
signal (SIGHUP, SIG_DFL);
signal (SIGTSTP, SIG_DFL);
signal (SIGTTIN, SIG_DFL);
signal (SIGTTOU, SIG_DFL);
signal (SIGINT, SIG_IGN);
signal (SIGQUIT, SIG_IGN);
signal (SIGHUP, SIG_IGN);
signal (SIGTSTP, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
signal (SIGTTOU, SIG_IGN);
child = fork ();
if (child < 0) {
/* error in fork() */
fprintf (stderr, "%s: failure forking: %s",
is_newgrp ? "newgrp" : "sg", strerror (errno));
exit (1);
} else if (child) {
/* parent - wait for child to finish, then log session close */
do {
pid = waitpid (child, NULL, 0);
} while (pid != child);
SYSLOG ((LOG_INFO,
"user `%s' (login `%s' on %s) returned to group `%s'",
name, loginname, tty,
getgrgid (gid)->gr_name));
closelog ();
exit (0);
}
/* child - restore signals to their default state */
signal (SIGINT, SIG_DFL);
signal (SIGQUIT, SIG_DFL);
signal (SIGHUP, SIG_DFL);
signal (SIGTSTP, SIG_DFL);
signal (SIGTTIN, SIG_DFL);
signal (SIGTTOU, SIG_DFL);
#endif /* USE_PAM */
}
#endif /* USE_SYSLOG */