If stdout isn't a tty, use unlimited width output rather than truncating to 79 characters. This is helpful for shell scripts or e.g., 'ps | grep foo'. This hardcoded width has some history: In The Beginning of History[0], the width of ps was hardcoded as 80 bytes. In 1985, Bloom@ added detection using TIOCGWINSZ on stdin.[1] In 1986, Kirk merged a change to check stdout's window size instead. In 1990, the fallback checks to stderr and stdin's TIOCGWINSZ were added by Marc@, with the commit message "new version."[2] OS X Darwin has a very similar modification to ps(1), which simply sets UNLIMITED for all non-tty outputs.[3] I've chosen to respect COLUMNS instead of behaving identically to Darwin here, but I don't feel strongly about that. We could match OS X for parity if that is desired. [0]: https://svnweb.freebsd.org/csrg/bin/ps/ps.c?annotate=1065 [1]: https://svnweb.freebsd.org/csrg/bin/ps/ps.c?r1=18105&r2=18106 [2]: https://svnweb.freebsd.org/csrg/bin/ps/ps.c?r1=40675&r2=40674&pathrev=40675 [3]: https://opensource.apple.com/source/adv_cmds/adv_cmds-168/ps/ps.c.auto.html PR: 217159 Reported by: Deepak Nagaraj <n.deepak at gmail.com> |
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extern.h | ||
fmt.c | ||
keyword.c | ||
Makefile | ||
Makefile.depend | ||
nlist.c | ||
print.c | ||
ps.1 | ||
ps.c | ||
ps.h |