man: document when the sd_bus_creds_xxx() calls return ENXIO
This commit is contained in:
Lennart Poettering
parent
cfeaa44a09
commit
52d7c4dcf1
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@ -799,16 +799,25 @@ MANPAGES_ALIAS += \
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man/sd_bus_creds_get_cgroup.3 \
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man/sd_bus_creds_get_cmdline.3 \
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man/sd_bus_creds_get_comm.3 \
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man/sd_bus_creds_get_connection_name.3 \
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man/sd_bus_creds_get_description.3 \
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man/sd_bus_creds_get_egid.3 \
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man/sd_bus_creds_get_euid.3 \
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man/sd_bus_creds_get_exe.3 \
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man/sd_bus_creds_get_fsgid.3 \
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man/sd_bus_creds_get_fsuid.3 \
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man/sd_bus_creds_get_gid.3 \
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man/sd_bus_creds_get_mask.3 \
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man/sd_bus_creds_get_owner_uid.3 \
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man/sd_bus_creds_get_ppid.3 \
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man/sd_bus_creds_get_selinux_context.3 \
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man/sd_bus_creds_get_session.3 \
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man/sd_bus_creds_get_sgid.3 \
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man/sd_bus_creds_get_slice.3 \
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man/sd_bus_creds_get_suid.3 \
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man/sd_bus_creds_get_supplementary_gids.3 \
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man/sd_bus_creds_get_tid.3 \
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man/sd_bus_creds_get_tid_comm.3 \
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man/sd_bus_creds_get_tty.3 \
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man/sd_bus_creds_get_uid.3 \
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man/sd_bus_creds_get_unique_name.3 \
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man/sd_bus_creds_get_unit.3 \
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@ -870,16 +879,25 @@ man/sd_bus_creds_get_audit_session_id.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_cgroup.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_cmdline.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_comm.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_connection_name.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_description.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_egid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_euid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_exe.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_fsgid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_fsuid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_gid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_mask.3: man/sd_bus_creds_new_from_pid.3
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man/sd_bus_creds_get_owner_uid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_ppid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_selinux_context.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_session.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_sgid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_slice.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_suid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_supplementary_gids.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_tid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_tid_comm.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_tty.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_uid.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_unique_name.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_get_unit.3: man/sd_bus_creds_get_pid.3
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@ -951,12 +969,24 @@ man/sd_bus_creds_get_cmdline.html: man/sd_bus_creds_get_pid.html
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man/sd_bus_creds_get_comm.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_connection_name.html: man/sd_bus_creds_get_pid.html
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man/sd_bus_creds_get_description.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_egid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_euid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_exe.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_fsgid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_fsuid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_gid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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@ -966,21 +996,36 @@ man/sd_bus_creds_get_mask.html: man/sd_bus_creds_new_from_pid.html
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man/sd_bus_creds_get_owner_uid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_ppid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_selinux_context.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_session.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_sgid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_slice.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_suid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_supplementary_gids.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_tid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_tid_comm.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_tty.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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man/sd_bus_creds_get_uid.html: man/sd_bus_creds_get_pid.html
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$(html-alias)
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@ -44,9 +44,17 @@
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<refnamediv>
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<refname>sd_bus_creds_get_pid</refname>
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<refname>sd_bus_creds_get_ppid</refname>
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<refname>sd_bus_creds_get_tid</refname>
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<refname>sd_bus_creds_get_uid</refname>
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<refname>sd_bus_creds_get_euid</refname>
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<refname>sd_bus_creds_get_suid</refname>
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<refname>sd_bus_creds_get_fsuid</refname>
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<refname>sd_bus_creds_get_gid</refname>
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<refname>sd_bus_creds_get_egid</refname>
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<refname>sd_bus_creds_get_sgid</refname>
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<refname>sd_bus_creds_get_fsgid</refname>
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<refname>sd_bus_creds_get_supplementary_gids</refname>
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<refname>sd_bus_creds_get_comm</refname>
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<refname>sd_bus_creds_get_tid_comm</refname>
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<refname>sd_bus_creds_get_exe</refname>
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@ -64,9 +72,10 @@
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<refname>sd_bus_creds_get_selinux_context</refname>
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<refname>sd_bus_creds_get_audit_session_id</refname>
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<refname>sd_bus_creds_get_audit_login_uid</refname>
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<refname>sd_bus_creds_get_tty</refname>
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<refname>sd_bus_creds_get_unique_name</refname>
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<refname>sd_bus_creds_get_well_known_names</refname>
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<refname>sd_bus_creds_get_connection_name</refname>
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<refname>sd_bus_creds_get_description</refname>
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<refpurpose>Retrieve fields from a credentials object</refpurpose>
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</refnamediv>
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@ -81,6 +90,12 @@
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<paramdef>pid_t *<parameter>pid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_ppid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>pid_t *<parameter>ppid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_tid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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@ -88,7 +103,25 @@
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
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<funcdef>int <function>sd_bus_creds_get_uid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_euid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_suid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_fsuid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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@ -99,6 +132,30 @@
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<paramdef>gid_t *<parameter>gid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_egid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>gid_t *<parameter>gid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_sgid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>gid_t *<parameter>gid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_fsgid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>gid_t *<parameter>gid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_supplementary_gids</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const gid_t **<parameter>gids</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_comm</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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@ -201,6 +258,12 @@
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<paramdef>uid_t *<parameter>loginuid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_tty</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>tty</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_unique_name</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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@ -214,7 +277,7 @@
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_connection_name</function></funcdef>
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<funcdef>int <function>sd_bus_creds_get_description</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>name</parameter></paramdef>
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</funcprototype>
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@ -226,26 +289,43 @@
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<title>Description</title>
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<para>These functions return information from an
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<parameter>sd_bus_creds</parameter> object. It may be created with
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<parameter>sd_bus_creds</parameter> credential object. Credential
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objects may be created with
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<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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in which case it will describe the specified process, or it may be
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created by
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in which case they describe the credentials of the process
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identified by the specified PID, with
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<citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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in which case they describe the credentials of a bus peer
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identified by the specified bus name, or with
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<citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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in which case it will describe the process at the other endpoint
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of a connection.
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</para>
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in which case they describe the credentials of the creator of a
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bus.</para>
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<para><function>sd_bus_creds_get_pid()</function> will retrieve the
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PID (process identifier).</para>
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<para><function>sd_bus_creds_get_pid()</function> will retrieve
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the PID (process identifier). Similar,
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<function>sd_bus_creds_get_ppid()</function> will retrieve the
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parent PID. Note that PID 1 has no parent process, in which case
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-ENXIO is returned.</para>
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<para><function>sd_bus_creds_get_tid()</function> will retrieve the
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TID (thread identifier).</para>
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<para><function>sd_bus_creds_get_uid()</function> will retrieve the
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numeric UID (user identifier).</para>
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<para><function>sd_bus_creds_get_uid()</function> will retrieve
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the numeric UID (user identifier). Similar,
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<function>sd_bus_creds_get_euid()</function> returns the effective
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UID, <function>sd_bus_creds_get_suid()</function> the saved UID
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and <function>sd_bus_creds_get_fsuid()</function> the file system
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UID.</para>
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<para><function>sd_bus_creds_get_gid()</function> will retrieve the
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numeric GID (group identifier).</para>
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numeric GID (group identifier). Similar,
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<function>sd_bus_creds_get_egid()</function> returns the effective
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GID, <function>sd_bus_creds_get_sgid()</function> the saved GID
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and <function>sd_bus_creds_get_fsgid()</function> the file system
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GID.</para>
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<para><function>sd_bus_creds_get_supplementary_gids()</function>
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will retrieve the supplementary GIDs list.</para>
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<para><function>sd_bus_creds_get_comm()</function> will retrieve the
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comm field (truncated name of the executable, as stored in
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<filename>/proc/<replaceable>pid</replaceable>/task/<replaceable>tid</replaceable>/comm</filename>).
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</para>
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<para><function>sd_bus_creds_get_exe()</function> will retrieve the
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path to the program (as stored in the
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<para><function>sd_bus_creds_get_exe()</function> will retrieve
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the path to the program executable (as stored in the
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<filename>/proc/<replaceable>pid</replaceable>/exe</filename>
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link, but with <literal> (deleted)</literal> suffix removed).
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</para>
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link, but with <literal> (deleted)</literal> suffix removed). Note
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that kernel threads do not have an executable path, in which case
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-ENXIO is returned.</para>
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<para><function>sd_bus_creds_get_cmdline()</function> will retrieve
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an array of command line arguments (as stored in
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<filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>).
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</para>
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<para><function>sd_bus_creds_get_cmdline()</function> will
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retrieve an array of command line arguments (as stored in
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<filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>). Note
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that kernel threads do not have a command line, in which case
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-ENXIO is returned.</para>
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<para><function>sd_bus_creds_get_cgroup()</function> will retrieve
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the cgroup path. See <ulink
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url="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt">cgroups.txt</ulink>.
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</para>
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<para><function>sd_bus_creds_get_unit()</function> will retrieve the
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systemd unit name (in the system instance of systemd) that the
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<para><function>sd_bus_creds_get_unit()</function> will retrieve
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the systemd unit name (in the system instance of systemd) that the
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process is part of. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. For
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processes that are not part of a unit returns -ENXIO.
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</para>
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<para><function>sd_bus_creds_get_user_unit()</function> will
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retrieve the systemd unit name (in the user instance of systemd)
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that the process is part of. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. For
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processes that are not part of a user unit returns -ENXIO.
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</para>
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||||
|
||||
<para><function>sd_bus_creds_get_slice()</function> will retrieve
|
||||
|
|
@ -291,17 +375,17 @@
|
|||
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
|
||||
</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_session()</function> will retrieve
|
||||
the logind session that the process is part of. See
|
||||
<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
|
||||
<para><function>sd_bus_creds_get_session()</function> will
|
||||
retrieve the logind session that the process is part of. See
|
||||
<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. For
|
||||
processes that are not part of a session returns -ENXIO.
|
||||
</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_owner_uid()</function> will retrieve
|
||||
the numeric UID (user identifier) of the user who owns the slice
|
||||
that the process is part of. See
|
||||
<para><function>sd_bus_creds_get_owner_uid()</function> will
|
||||
retrieve the numeric UID (user identifier) of the user who owns
|
||||
the session that the process is part of. See
|
||||
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
||||
<!-- and
|
||||
<citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> -->.
|
||||
For processes that are not part of a session returns -ENXIO.
|
||||
</para>
|
||||
|
||||
<para><function>sd_bus_creds_has_effective_cap()</function> will
|
||||
|
|
@ -331,12 +415,18 @@
|
|||
<para><function>sd_bus_creds_get_selinux_context()</function> will
|
||||
retrieve the SELinux security context (label) of the process.</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_audit_session_id()</function> will
|
||||
retrieve the audit session identifier of the process.</para>
|
||||
<para><function>sd_bus_creds_get_audit_session_id()</function>
|
||||
will retrieve the audit session identifier of the process. Returns
|
||||
-ENXIO for processes that are not part of an audit session.</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_audit_login_uid()</function> will
|
||||
retrieve the audit user login identifier (the identifier of the
|
||||
user who is "responsible" for the session).</para>
|
||||
user who is "responsible" for the session). Returns -ENXIO for
|
||||
processes that are not part of an audit session.</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_tty()</function> will retrieve
|
||||
the controlling TTY. Returns -ENXIO for processes that have no
|
||||
controlling TTY.</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_unique_name()</function> will
|
||||
retrieve the D-Bus unique name. See <ulink
|
||||
|
|
@ -348,11 +438,11 @@
|
|||
url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
|
||||
D-Bus specification</ulink>.</para>
|
||||
|
||||
<para><function>sd_bus_creds_get_connection_name()</function> will
|
||||
<para><function>sd_bus_creds_get_description()</function> will
|
||||
retrieve a descriptive name of the bus connection of the
|
||||
peer. This name is useful to discern multiple bus connections by
|
||||
the same peer, and may be altered by the peer with the
|
||||
<citerefentry><refentrytitle>sd_bus_set_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||||
<citerefentry><refentrytitle>sd_bus_set_description</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||||
call.</para>
|
||||
|
||||
<para>All functions that take a <parameter>const
|
||||
|
|
@ -386,31 +476,34 @@
|
|||
<varlistentry>
|
||||
<term><constant>-ENODATA</constant></term>
|
||||
|
||||
<listitem><para>Given field is not available in
|
||||
<parameter>c</parameter>.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><constant>-ENOENT</constant></term>
|
||||
|
||||
<listitem><para>Given field is not specified for the sender.
|
||||
This will be returned by <function>sd_bus_get_unit()</function>,
|
||||
<function>sd_bus_get_user_unit()</function>,
|
||||
<function>sd_bus_get_slice()</function>,
|
||||
<function>sd_bus_get_session()</function>, and
|
||||
<function>sd_bus_get_name_creds_uid()</function> if the sender is not
|
||||
part of a systemd system unit, systemd user unit, systemd
|
||||
slice, logind session, or a systemd user session.</para>
|
||||
<listitem><para>Given field is not available in the
|
||||
credentials object <parameter>c</parameter>.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><constant>-ENXIO</constant></term>
|
||||
|
||||
<listitem><para>An error occurred in parsing cgroup paths.
|
||||
<filename>libsystemd</filename> might be out of sync with
|
||||
the running systemd version.</para></listitem>
|
||||
<listitem><para>Given field is not specified for the described
|
||||
process or peer. This will be returned by
|
||||
<function>sd_bus_get_unit()</function>,
|
||||
<function>sd_bus_get_user_unit()</function>,
|
||||
<function>sd_bus_get_slice()</function>,
|
||||
<function>sd_bus_get_session()</function>, and
|
||||
<function>sd_bus_get_owner_uid()</function> if the process is
|
||||
not part of a systemd system unit, systemd user unit, systemd
|
||||
slice, or logind session. It will also be returned by
|
||||
<function>sd_bus_creds_get_exe()</function> and
|
||||
<function>sd_bus_creds_get_cmdline()</function> for kernel
|
||||
threads (since these aren't started from an executable binary
|
||||
or have a command line),
|
||||
<function>sd_bus_creds_get_audit_session_id()</function> and
|
||||
<function>sd_bus_creds_get_audit_login_uid()</function> when
|
||||
the process is not part of an audit session, and
|
||||
<function>sd_bus_creds_get_tty()</function> if the process has
|
||||
no controlling TTY.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
|
|
|
|||
Loading…
Reference in New Issue