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| author | Leah Neukirchen <leah@vuxu.org> | 2017-10-20 16:05:47 +0200 |
|---|---|---|
| committer | Leah Neukirchen <leah@vuxu.org> | 2017-10-20 16:05:47 +0200 |
| commit | 732c5f08eaaf288ded6807f07e9cd6733fec6919 (patch) | |
| tree | a540e82d562ec6a325f9dc4cd2e83abf151233b5 | |
| parent | 52efa37b37f8e7c6a90eac0f0bfd939f34b4d6c9 (diff) | |
| download | necho-732c5f08eaaf288ded6807f07e9cd6733fec6919.tar.gz necho-732c5f08eaaf288ded6807f07e9cd6733fec6919.tar.xz necho-732c5f08eaaf288ded6807f07e9cd6733fec6919.zip | |
add caveat about Linux proc(5)
| -rw-r--r-- | necho.1 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/necho.1 b/necho.1 index 567e436..681c7e1 100644 --- a/necho.1 +++ b/necho.1 @@ -55,6 +55,27 @@ These utilities exit 0 on success, and >0 if an error occurs. .Nm secho is a POSIX-conforming, but not XSI-conforming implementation of .Xr echo 1 . +.Sh CAVEATS +These tools use +.Xr writev 2 +syscalls for efficient output. +This generally works fine, +but there is a problem with using this function when writing to +the Linux +.Xr proc 5 +filesystem: +only the first buffer will be regarded as a write. +.Pp +Therefore, +.Pp +.Dl jecho 60 >/proc/sys/kernel/panic +.Pp +will work, but +.Pp +.Dl jecho 6 0 >/proc/sys/kernel/panic +.Pp +will just be regarded as a write of +.Sq Li 6 . .Sh AUTHORS .An Leah Neukirchen Aq Mt leah@vuxu.org .Sh LICENSE |