Change Details

r325740 moved dhclient to the cap_syslog service, while r341692 changed cap_syslog to inherit stdio descriptors from its parent process. The broke the ability to capture dhclient's foreground output, as the cap_syslog service now holds the original stdio descriptors open after dhclient daemonizes. Add a new libcasper(3) call, cap_close_stdio() to allow a parent process to revoke stdin/stdout/stderr access from a casper service, and consume that call in dhclient. PR: 234514

r325740 moved dhclient to the cap_syslog service, while r341692 changed cap_syslog to inherit stdio descriptors from its parent process. The broke the ability to capture dhclient's foreground output, as the cap_syslog service now holds the original stdio descriptors open after dhclient daemonizes. Since syslog(3) only requires stdio access for the LOG_PERROR case (which dhclient doesn't use), instead revert r341692 and in the LOG_PERROR case supply the parent's stderr descriptor as an argument within the implementation of cap_openlog(). PR: 234514

r325740 moved dhclient to the cap_syslog service, while r341692 changed cap_syslog to inherit stdio descriptors from its parent process. The broke the ability to capture dhclient's foreground output, as the cap_syslog service now holds the original stdio descriptors open after dhclient daemonizes. Add a new libcasper Since syslog(3) call, cap_close_only requires stdio()o access for the to allow a parent process to revoke stdin/stdout/stderr access from aLOG_PERROR case (which dhclient doesn't use), instead revert r341692 casper service, and consume that call in dhclientand in the LOG_PERROR case supply the parent's stderr descriptor as an argument within the implementation of cap_openlog(). PR: 234514