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. Signed-off-by: Fernando Luis Vazquez Cao <fernando@xxxxxxxxxxxxx> --- --- proc.5.orig 2008-02-06 14:11:58.000000000 +0900 +++ proc.5 2008-02-06 14:56:22.000000000 +0900 @@ -87,12 +87,11 @@ plus one \fIunsigned long\fP value for e 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: -that is, a read on this file will return 0 characters. -The command line arguments appear in this file as a set of -null-separated strings, with a further null byte after the last string. +This holds the complete command line for the process, unless the process is a +zombie. 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 null-separated strings, with a further null byte after the +last string. .TP .I /proc/[number]/cwd This is a symbolic link to the current working directory of the process. - To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
