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author | Clinton Bunch <cdb_zsh@zentaur.org> | 2019-03-22 17:11:19 -0500 |
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committer | dana <dana@dana.is> | 2019-03-22 17:11:19 -0500 |
commit | ea8d3ab3e41f600a3564a8d92bd630468a1af036 (patch) | |
tree | 1071589108729c99cc80563c6f73000a204dc5e8 /Doc/Zsh/mod_system.yo | |
parent | 5267bdc4ef91c1609bf0499861cc46f63e9e5784 (diff) | |
download | zsh-ea8d3ab3e41f600a3564a8d92bd630468a1af036.tar.gz zsh-ea8d3ab3e41f600a3564a8d92bd630468a1af036.tar.xz zsh-ea8d3ab3e41f600a3564a8d92bd630468a1af036.zip |
44156 (tweaked): zsh/system: Add note about potential flock side-effects
(Minor adjustments to wording and formatting)
Diffstat (limited to 'Doc/Zsh/mod_system.yo')
-rw-r--r-- | Doc/Zsh/mod_system.yo | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Doc/Zsh/mod_system.yo b/Doc/Zsh/mod_system.yo index a27bab47f..3a85e760f 100644 --- a/Doc/Zsh/mod_system.yo +++ b/Doc/Zsh/mod_system.yo @@ -177,8 +177,11 @@ locked by opening a file descriptor to the file and applying a lock to the file descriptor. The lock terminates when the shell process that created the lock exits; it is therefore often convenient to create file locks within subshells, since the lock is automatically released when -the subshell exits. Status 0 is returned if the lock succeeds, else -status 1. +the subshell exits. Note that use of the tt(print) builtin with the +tt(-u) option will, as a side effect, release the lock, as will redirection +to the file in the shell holding the lock. To work around this use a +subshell, e.g. `tt((print message) >> )var(file)'. Status 0 is +returned if the lock succeeds, else status 1. In the second form the file descriptor given by the arithmetic expression var(fd_expr) is closed, releasing a lock. The file descriptor |