[Bug server/15083] New: stapdyn needs system() support

["dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15083

             Bug #: 15083
           Summary: stapdyn needs system() support
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
        AssignedTo: systemtap@sourceware.org
        ReportedBy: dsmith@redhat.com
        Depends on: 14491
    Classification: Unclassified


Stapdyn needs support for the system() function, which allows users to execute
system commands in probes, like the following:

====
# stap -e 'probe begin { system("whoami"); exit() }'
dsmith
====

When you try this with dyninst, you get compilation errors:

====
stap --runtime=dyninst -e 'probe begin { system("whoami"); exit() }'
/tmp/stappmcBwb/stap_6e2d98d4dd508c0d340cf52b43604b2c_1111_src.c: In function
‘function_system’:
/tmp/stappmcBwb/stap_6e2d98d4dd508c0d340cf52b43604b2c_1111_src.c:112:2: error:
implicit declaration of function ‘_stp_ctl_send’
[-Werror=implicit-function-declaration]
  _stp_ctl_send(STP_SYSTEM, STAP_ARG_cmd, strlen(STAP_ARG_cmd)+1);
  ^
cc1: all warnings being treated as errors
WARNING: gcc exited with status: 1
Pass 4: compilation failed.  [man error::pass4]
====

(The fix here most likely depends on bug #14491.)

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