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Linux 2.4.21 added core_pattern (which was already in 2.6). 

Noted a few more reasons why a core dump file might not be produced.
This commit is contained in:
Michael Kerrisk 2006-11-25 01:45:17 +00:00
parent 53e4da489a
commit 10cd859add
1 changed files with 12 additions and 5 deletions
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man5/core.5
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@ -51,6 +51,14 @@ is not writable
or is not a regular file or is not a regular file
(e.g., it is a directory or a symbolic link). (e.g., it is a directory or a symbolic link).
.IP * .IP *
A (writable, regular) file with the same name as would be used for the
core dump already exists, but there is more than one hard link to that
file.
.IP *
The file system where the core dump file would be created is full;
or has run out of i-nodes; or is mounted read only;
or the user has reached their quota for the file system.
.IP *
The directory in which the core dump file is to be created does The directory in which the core dump file is to be created does
not exist. not exist.
.IP * .IP *
@ -79,7 +87,7 @@ By default, a core dump file is named
but the but the
.I /proc/sys/kernel/core_pattern .I /proc/sys/kernel/core_pattern
file file
(new in Linux 2.5) (since Linux 2.6 and 2.4.21)
can be set to define a template that is used to name core dump files. can be set to define a template that is used to name core dump files.
The template can contain % specifiers which are substituted The template can contain % specifiers which are substituted
by the following values when a core file is created: by the following values when a core file is created:
@ -111,9 +119,8 @@ does not include "%p" and
(see below) (see below)
is non-zero, then .PID will be appended to the core filename. is non-zero, then .PID will be appended to the core filename.
Linux 2.4 does not provide Since version 2.4, Linux has also provided
.IR /proc/sys/kernel/core_pattern , a more primitive method of controlling
but does provide a more primitive method of controlling
the name of the core dump file. the name of the core dump file.
If the If the
.I /proc/sys/kernel/core_uses_pid .I /proc/sys/kernel/core_uses_pid
@ -141,7 +148,7 @@ filename via a %p specification in
.\" it might be worth incorporating it into the text: .\" it might be worth incorporating it into the text:
.\" Always including the PID in the name of the core file made .\" Always including the PID in the name of the core file made
.\" sense for LinuxThreads, where each thread had a unique PID, .\" sense for LinuxThreads, where each thread had a unique PID,
.\" but doesn't seem to server any purposewith NPTL, where all the .\" but doesn't seem to server any purpose with NPTL, where all the
.\" threads in a process share the same PID (as POSIX.1 requires). .\" threads in a process share the same PID (as POSIX.1 requires).
.\" Probably the behaviour is maintained so that applications using .\" Probably the behaviour is maintained so that applications using
.\" LinuxThreads continue appending the PID (the kernel has no easy .\" LinuxThreads continue appending the PID (the kernel has no easy