Launch a login shell - utmp - simple login manager
HTML git clone git://git.suckless.org/utmp
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 4a855c000f1d300a44c784ed88d78a11d41cdca7
DIR parent 9631182347109af70cc725aabd6d567c83e989ec
HTML Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date: Fri, 29 Aug 2014 20:08:22 +0200
Launch a login shell
Since we are creating a utmp entry, it is logical to create a login
shell
Diffstat:
M utmp.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
---
DIR diff --git a/utmp.c b/utmp.c
@@ -38,8 +38,10 @@ int
main(int argc, char *argv[])
{
int status;
+ size_t len;
uid_t uid;
sigset_t set;
+ char *p, argv0[FILENAME_MAX], *sh;
extern void addutmp(void), delutmp(void);
egid = getegid();
@@ -59,15 +61,23 @@ main(int argc, char *argv[])
setenv("SHELL", pw->pw_shell, 1);
setenv("HOME", pw->pw_dir, 1);
+ if ((p = strrchr(pw->pw_shell, '/')) == NULL)
+ die("incorrect shell field of passwd");
+ if ((len = strlen(++p)) > sizeof(argv0) - 2)
+ die("shell name too long");
+ argv0[0] = '-';
+ memcpy(&argv0[1], p, len);
+
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, NULL);
switch (fork()) {
case 0:
sigprocmask(SIG_UNBLOCK, &set, NULL);
- argv[0] = getenv("SHELL");
- execv(argv[0], argv);
- die("error executing shell:%s", strerror(errno));
+ sh = pw->pw_shell;
+ argv[0] = argv0;
+ execv(sh, argv);
+ die("error executing shell(%s):%s", sh, strerror(errno));
case -1:
die("error spawning child:%s", strerror(errno));
default: