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* pid_output.c: (pid_output_lock) Fix 2 bugs: when locking, should
set l_whence to SEEK_SET, not SEEK_END. And after writing new
pid to file, must ftruncate to eliminate any extraneous bytes left
over from the last time a pid was written.
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* global: Replace strerror with safe_strerror. And vtysh/vtysh.c
needs to include "log.h" to pick up the declaration.
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* configure.ac (and everywhere a regular file is opened for
writing): use file permissions from configure rather than
compiled-in umask.
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* lib/pid_output.c: (pid_output_lock) undo paulj's mindless edit.
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* lib/pid_output.c: (pid_output) call pid_output_lock if we have
fcntl().
(pid_output_lock) grab exclusive write lock on pid file, rather
than rely on (fragile) exclusive create.
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