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Add three options to 'ulimit' (#406)

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This patch adds a few extra options to the ulimit command (if the OS
supports them). These options are also present in Bash, although in ksh
additional long forms of each option are available:
  ulimit -k/--kqueues   This is the maximum number of kqueues.
  ulimit -P/--npts      This is the maximum number of pseudo-terminals.
  ulimit -R/--rttime    This is the time a real-time process can run
                        before blocking, in microseconds. When the
                        limit is exceeded, the process is sent SIGXCPU.

Other changes:
- bltins/ulimit.c: Change the formatting from sfprintf and increase the
  size of the tmp buffer to prevent text from being cut off in ulimit
  -a (this was required to add ulimit -R).
- data/limits.c: Add support for using microseconds as a unit.
This commit is contained in:
Johnothan King 2021-12-28 13:55:56 -08:00 • committed by Martijn Dekker
parent 8f24d4dc56
commit 8f9d1bec97
8 changed files with 53 additions and 8 deletions
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9
ANNOUNCE
View file

@ -47,6 +47,15 @@ New features in built-in commands:
builtin
file
- Added three options to the ulimit builtin with the same names and
functionality as in Bash:
- 'ulimit -k' sets the maximum number of kqueues.
- 'ulimit -P' sets the maximum number of pseudo-terminals.
- 'ulimit -R' sets the maximum time in microseconds a real-time process
can run before blocking.
Note that to use these options the operating system must support the
corresponding resource limit.
### MAIN CHANGES between 1.0.0-beta.1 and 1.0.0-beta.2 ###
New features in built-in commands:

11
NEWS
View file

@ -3,6 +3,17 @@ For full details, see the git log at: https://github.com/ksh93/ksh
Any uppercase BUG_* names are modernish shell bug IDs.
2021-12-28:
- Added three options to the ulimit builtin with the same names and
functionality as in Bash:
- 'ulimit -k' sets the maximum number of kqueues.
- 'ulimit -P' sets the maximum number of pseudo-terminals.
- 'ulimit -R' sets the maximum time in microseconds a real-time process
can run before blocking.
Note that to use these options the operating system must support the
corresponding resource limit.
2021-12-27:
- Two bash-like flags for 'whence' were backported from ksh 93v-:

6
src/cmd/ksh93/bltins/ulimit.c
View file

@ -19,7 +19,7 @@
* *
***********************************************************************/
/*
* ulimit [-HSaMctdfxlqenupmrbiswTv] [limit]
* ulimit [-HSaMctdfkxlqenuPpmrRbiswTv] [limit]
*
* David Korn
* AT&T Labs
@ -78,7 +78,7 @@ int b_ulimit(int argc,char *argv[],Shbltin_t *context)
char* conf;
int label, unit, nosupport;
rlim_t i;
char tmp[32];
char tmp[41];
Optdisc_t disc;
memset(&disc, 0, sizeof(disc));
disc.version = OPT_VERSION;
@ -218,7 +218,7 @@ int b_ulimit(int argc,char *argv[],Shbltin_t *context)
sfsprintf(tmp,sizeof(tmp),"%s (%ss)", tp->description, e_units[tp->type]);
else
sfsprintf(tmp,sizeof(tmp),"%s", tp->name);
sfprintf(sfstdout,"%-30s (-%c) ",tmp,tp->option);
sfprintf(sfstdout,"%-39s (-%c) ",tmp,tp->option);
}
if(nosupport)
{

2
src/cmd/ksh93/data/builtins.c
View file

@ -1906,7 +1906,7 @@ const char sh_opttypeset[] =
;
const char sh_optulimit[] =
"[-1c?@(#)$Id: ulimit (AT&T Research) 2003-06-21 $\n]"
"[-1c?@(#)$Id: ulimit (ksh 93u+m) 2021-12-28 $\n]"
"[--catalog?" SH_DICT "]"
"[+NAME?ulimit - set or display resource limits]"
"[+DESCRIPTION?\bulimit\b sets or displays resource limits. These "

7
src/cmd/ksh93/data/limits.c
View file

@ -30,9 +30,9 @@
#ifndef _no_ulimit
const char e_unlimited[] = "unlimited";
const char* e_units[] = { 0, "block", "byte", "Kibyte", "second" };
const char* e_units[] = { 0, "block", "byte", "Kibyte", "second", "microsecond" };
const int shtab_units[] = { 1, 512, 1, 1024, 1 };
const int shtab_units[] = { 1, 512, 1, 1024, 1, 1 };
const Limit_t shtab_limits[] =
{
@ -41,15 +41,18 @@ const Limit_t shtab_limits[] =
"cpu", "cpu time", RLIMIT_CPU, 0, 't', LIM_SECOND,
"data", "data size", RLIMIT_DATA, 0, 'd', LIM_KBYTE,
"fsize", "file size", RLIMIT_FSIZE, 0, 'f', LIM_BLOCK,
"kqueues", "number of kqueues", RLIMIT_KQUEUES, 0, 'k', LIM_COUNT,
"locks", "number of file locks", RLIMIT_LOCKS, 0, 'x', LIM_COUNT,
"memlock", "locked address space", RLIMIT_MEMLOCK, 0, 'l', LIM_KBYTE,
"msgqueue", "message queue size", RLIMIT_MSGQUEUE,0, 'q', LIM_KBYTE,
"nice", "scheduling priority", RLIMIT_NICE, 0, 'e', LIM_COUNT,
"nofile", "number of open files", RLIMIT_NOFILE, "OPEN_MAX", 'n', LIM_COUNT,
"nproc", "number of processes", RLIMIT_NPROC, "CHILD_MAX", 'u', LIM_COUNT,
"npts", "number of pseudo-terminals", RLIMIT_NPTS, 0, 'P', LIM_COUNT,
"pipe", "pipe buffer size", RLIMIT_PIPE, "PIPE_BUF", 'p', LIM_BYTE,
"rss", "max memory size", RLIMIT_RSS, 0, 'm', LIM_KBYTE,
"rtprio", "max real-time priority",RLIMIT_RTPRIO, 0, 'r', LIM_COUNT,
"rttime", "max time before blocking", RLIMIT_RTTIME, 0, 'R', LIM_MICROSECOND,
"sbsize", "socket buffer size", RLIMIT_SBSIZE, "PIPE_BUF", 'b', LIM_BYTE,
"sigpend", "signal queue size", RLIMIT_SIGPENDING,"SIGQUEUE_MAX",'i', LIM_COUNT,
"stack", "stack size", RLIMIT_STACK, 0, 's', LIM_KBYTE,

10
src/cmd/ksh93/include/ulimit.h
View file

@ -103,6 +103,9 @@
#ifndef RLIMIT_FSIZE
#define RLIMIT_FSIZE RLIMIT_UNKNOWN
#endif
#ifndef RLIMIT_KQUEUES
#define RLIMIT_KQUEUES RLIMIT_UNKNOWN
#endif
#ifndef RLIMIT_LOCKS
#define RLIMIT_LOCKS RLIMIT_UNKNOWN
#endif
@ -121,6 +124,9 @@
#ifndef RLIMIT_NPROC
#define RLIMIT_NPROC RLIMIT_UNKNOWN
#endif
#ifndef RLIMIT_NPTS
#define RLIMIT_NPTS RLIMIT_UNKNOWN
#endif
#ifndef RLIMIT_PIPE
#define RLIMIT_PIPE RLIMIT_UNKNOWN
#endif
@ -133,6 +139,9 @@
#ifndef RLIMIT_RTPRIO
#define RLIMIT_RTPRIO RLIMIT_UNKNOWN
#endif
#ifndef RLIMIT_RTTIME
#define RLIMIT_RTTIME RLIMIT_UNKNOWN
#endif
#ifndef RLIMIT_SBSIZE
#define RLIMIT_SBSIZE RLIMIT_UNKNOWN
#endif
@ -154,6 +163,7 @@
#define LIM_BYTE 2
#define LIM_KBYTE 3
#define LIM_SECOND 4
#define LIM_MICROSECOND 5
typedef struct Limit_s
{

2
src/cmd/ksh93/include/version.h
View file

@ -21,7 +21,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2021-12-27" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-12-28" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */

14
src/cmd/ksh93/sh.1
View file

@ -8079,7 +8079,7 @@ that have attributes
are printed.
.RE
.TP
\f3ulimit\fP \*(OK \f3\-HSaMctdfxlqenupmrbiswTv\fP \*(CK \*(OK \f2limit\^\fP \*(CK
\f3ulimit\fP \*(OK \f3\-HSaMctdfkxlqenuPpmrRbiswTv\fP \*(CK \*(OK \f2limit\^\fP \*(CK
Set or display a resource limit.
The available resource limits are listed below.
Many systems do not support one or more of these limits.
@ -8137,6 +8137,9 @@ current process or by child processes (files of any size may be read).
.B \-i
The signal queue size.
.TP
.B \-k
The max number of kqueues created by the current user.
.TP
.B \-l
The locked address space in K-bytes.
.TP
@ -8149,12 +8152,21 @@ The number of K-bytes on the size of physical memory.
.B \-n
The number of file descriptors plus 1.
.TP
.B \-P
The max number of pseudo-terminals created by the current user.
.TP
.B \-p
The number of 512-byte blocks for pipe buffering.
.TP
.B \-q
The message queue size in K-bytes.
.TP
.B \-R
The max time a real-time process can run before blocking, in microseconds. If this limit is exceeded
the process is sent a
.B SIGXCPU
signal.
.TP
.B \-r
The max real-time priority.
.TP