Mercurial > hg
view mercurial/help/pager.txt @ 35460:8652ab4046e4
osutil: add a function to unblock signals
Signals could be blocked by something like:
#include <unistd.h>
#include <signal.h>
int main(int argc, char * const argv[]) {
sigset_t set;
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, NULL);
execv("/bin/hg", argv);
return 0;
}
One of the problems is if SIGCHLD is blocked, chgserver would not reap
zombie workers since it depends on SIGCHLD handler entirely.
While it's the parent process to blame but it seems a good idea to just
unblock the signal from hg. FWIW git does that for SIGPIPE already [1].
Unfortunately Python 2 does not reset or provide APIs to change signal
masks. Therefore let's add one in osutil. Note: Python 3.3 introduced
`signal.pthread_sigmask` which solves the problem.
`sigprocmask` is part of POSIX [2] so there is no feature testing in
`setup.py`.
[1]: https://github.com/git/git/commit/7559a1be8a0afb10df41d25e4cf4c5285a5faef1
[2]: http://pubs.opengroup.org/onlinepubs/7908799/xsh/sigprocmask.html
Differential Revision: https://phab.mercurial-scm.org/D1736
author | Jun Wu <quark@fb.com> |
---|---|
date | Wed, 20 Dec 2017 02:13:35 -0800 |
parents | 85b978031a75 |
children |
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Some Mercurial commands can produce a lot of output, and Mercurial will attempt to use a pager to make those commands more pleasant. To set the pager that should be used, set the application variable:: [pager] pager = less -FRX If no pager is set in the user or repository configuration, Mercurial uses the environment variable $PAGER. If $PAGER is not set, pager.pager from the default or system configuration is used. If none of these are set, a default pager will be used, typically `less` on Unix and `more` on Windows. .. container:: windows On Windows, `more` is not color aware, so using it effectively disables color. MSYS and Cygwin shells provide `less` as a pager, which can be configured to support ANSI color codes. See :hg:`help config.color.pagermode` to configure the color mode when invoking a pager. You can disable the pager for certain commands by adding them to the pager.ignore list:: [pager] ignore = version, help, update To ignore global commands like :hg:`version` or :hg:`help`, you have to specify them in your user configuration file. To control whether the pager is used at all for an individual command, you can use --pager=<value>: - use as needed: `auto`. - require the pager: `yes` or `on`. - suppress the pager: `no` or `off` (any unrecognized value will also work). To globally turn off all attempts to use a pager, set:: [ui] paginate = never which will prevent the pager from running.