Bug#833559: systemd user service standard output is not line-buffered

[Daniel Kahn Gillmor]

Package: systemd
Version: 230-7
Severity: normal

I've tested the following short-lived "daemon" as a systemd user service:

-------
#include <stdio.h>
#include <unistd.h>

int main(int argc, char **argv)
{
  sleep(5);
  printf("a test\n");
  sleep(10);
  return 0;
}
-------

the "a test" line doesn't show up in the user journal when i would
expect it to.  it appears that stdout is not line-buffered.

stderr, on the other hand, does appear to be line-buffered --
newline-terminated strings written to stderr show up immediately in
the journal.

i'd expect both stdout and stderr to be line-buffered.

    --dkg

-- Package-specific info:

-- System Information:
Debian Release: stretch/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing'), (200, 'unstable-debug'), (200, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-rc7-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.115
ii  libacl1         2.2.52-3
ii  libapparmor1    2.10.95-4
ii  libaudit1       1:2.6.5-1
ii  libblkid1       2.28-6
ii  libc6           2.23-4
ii  libcap2         1:2.25-1
ii  libcap2-bin     1:2.25-1
ii  libcryptsetup4  2:1.7.0-2
ii  libgcrypt20     1.7.2-2
ii  libgpg-error0   1.24-1
ii  libidn11        1.33-1
ii  libkmod2        22-1.1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.28-6
ii  libpam0g        1.1.8-3.3
ii  libseccomp2     2.3.1-2
ii  libselinux1     2.5-3
ii  libsystemd0     230-7
ii  mount           2.28-6
ii  util-linux      2.28-6

Versions of packages systemd recommends:
ii  dbus            1.10.8-1
ii  libpam-systemd  230-7

Versions of packages systemd suggests:
ii  policykit-1        0.105-16
ii  systemd-container  230-7
pn  systemd-ui         <none>

Versions of packages systemd is related to:
ii  udev  230-7

-- no debconf information