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I am in the process of converting to CentOS 6.5 from 5.5 and need a way to check if sendmail is on or not. For reasons I don't want to go through, I need to be able to check if sendmail is ON as a NON root user. In CentOS 5.5, I could use /sbin/service sendmail status running as a non root user. In CentOS 6.5, security is a bit tighter and new code was added to the /etc/init.d/sendmail script:

# Check that we're a privileged user
[ `id -u` = 0 ] || exit 4

The sendmail script uses the following code to check it's status:

status)
   echo -n sendmail; status -p /var/run/sendmail.pid -l sendmail
   RETVAL=$?
   echo -n sm-client; status -p /var/run/sm-client.pid -l sm-client
   [ $RETVAL -eq 0 ] && RETVAL=$?
  ;;

In the beginning of the sendmail script the functions library is source so status() can be called in the functions script

 # Source function library.
. /etc/rc.d/init.d/functions

As root, you would typically see this when running /sbin/service sendmail status:

sendmail (pid  1107) is running...
sm-client (pid  1115) is running...

When running as a NON root user I receive return code 4

What I have tried so far is checking /var/run/sendmail.pid to get the process ID, then I check to see if there is there is and entry in /proc for the pid. For example,

As a NON root user:

cat /var/run/sendmail.pid - Get the pid

1107
/usr/sbin/sendmail -bd -q3600s

Then I check /proc/1107/status:

Name:   sendmail
State:  S (sleeping)
Tgid:   1107
Pid:    1107
PPid:   1
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       51      51      51
Utrace: 0
FDSize: 32
Groups: 51
VmPeak:    12844 kB
VmSize:    12840 kB
VmLck:         0 kB
VmHWM:      2020 kB
VmRSS:      2020 kB
VmData:     1176 kB
VmStk:       208 kB
VmExe:       824 kB
VmLib:     10156 kB
VmPTE:        44 kB
VmSwap:        0 kB
Threads:        1
SigQ:   0/3865
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000001006
SigCgt: 0000000180016201
CapInh: 0000000000000000
CapPrm: ffffffffffffffff
CapEff: ffffffffffffffff
CapBnd: ffffffffffffffff
Cpus_allowed:   1
Cpus_allowed_list:      0
Mems_allowed:   1
Mems_allowed_list:      0
voluntary_ctxt_switches:        560
nonvoluntary_ctxt_switches:     2

If /proc/<pid> doesn't exist, I know the service is not on.. This method seems to work, but I don't trust it completely and would rather use /sbin/service sendmail status.

Any ideas on the best way to check if sendmail service is running as a NON root user??

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