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Update /proc/[number]/cmdline description. 

It used to be true that the command line arguments were
not accessible when the process had been swapped out.
In ancient kernels (circa 2.0.*) the problem was that the
kernel relied on get_phys_addr to access the user space buffer,
which stopped working as soon as the process was swapped out.
Recent kernels use get_user_pages for the same purpose and thus
they should not have that limitation.
This commit is contained in:
Michael Kerrisk 2008-02-22 07:41:04 +00:00
parent 8960f1e41c
commit b447cd586d
1 changed files with 5 additions and 4 deletions
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9
man5/proc.5
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@ -87,11 +87,12 @@ plus one \fIunsigned long\fP value for each entry.
The last entry contains two zeros.
.TP
.I /proc/[number]/cmdline
This holds the complete command line for the process, unless the whole
process has been swapped out or the process is a zombie.
In either of these latter cases, there is nothing in this file:
This holds the complete command line for the process,
unless the process is a zombie.
.\" In 2.3.26, this also used to be true if the process was swapped out.
In the latter case, there is nothing in this file:
that is, a read on this file will return 0 characters.
The command line arguments appear in this file as a set of
The command-line arguments appear in this file as a set of
null-separated strings, with a further null byte after the last string.
.TP
.I /proc/[number]/cwd