ref: 9d09242bee8489b6cdee246489063488bb52b1fb
dir: /sys/src/ape/cmd/pdksh/c_ulimit.c/
/*
ulimit -- handle "ulimit" builtin
Reworked to use getrusage() and ulimit() at once (as needed on
some schizophenic systems, eg, HP-UX 9.01), made argument parsing
conform to at&t ksh, added autoconf support. Michael Rendell, May, '94
Eric Gisin, September 1988
Adapted to PD KornShell. Removed AT&T code.
last edit: 06-Jun-1987 D A Gwyn
This started out as the BRL UNIX System V system call emulation
for 4.nBSD, and was later extended by Doug Kingston to handle
the extended 4.nBSD resource limits. It now includes the code
that was originally under case SYSULIMIT in source file "xec.c".
*/
#include "sh.h"
#include "ksh_time.h"
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif /* HAVE_SYS_RESOURCE_H */
#ifdef HAVE_ULIMIT_H
# include <ulimit.h>
#else /* HAVE_ULIMIT_H */
# ifdef HAVE_ULIMIT
extern long ulimit();
# endif /* HAVE_ULIMIT */
#endif /* HAVE_ULIMIT_H */
#define SOFT 0x1
#define HARD 0x2
#ifdef RLIM_INFINITY
# define KSH_RLIM_INFINITY RLIM_INFINITY
#else
# define KSH_RLIM_INFINITY ((rlim_t) 1 << (sizeof(rlim_t) * 8 - 1) - 1)
#endif /* RLIM_INFINITY */
int
c_ulimit(char **wp)
{
static const struct limits {
const char *name;
enum { RLIMIT, ULIMIT } which;
int gcmd; /* get command */
int scmd; /* set command (or -1, if no set command) */
int factor; /* multiply by to get rlim_{cur,max} values */
char option;
} limits[] = {
/* Do not use options -H, -S or -a */
#ifdef RLIMIT_CPU
{ "time(cpu-seconds)", RLIMIT, RLIMIT_CPU, RLIMIT_CPU, 1, 't' },
#endif
#ifdef RLIMIT_FSIZE
{ "file(blocks)", RLIMIT, RLIMIT_FSIZE, RLIMIT_FSIZE, 512, 'f' },
#else /* RLIMIT_FSIZE */
# ifdef UL_GETFSIZE /* x/open */
{ "file(blocks)", ULIMIT, UL_GETFSIZE, UL_SETFSIZE, 1, 'f' },
# else /* UL_GETFSIZE */
# ifdef UL_GFILLIM /* svr4/xenix */
{ "file(blocks)", ULIMIT, UL_GFILLIM, UL_SFILLIM, 1, 'f' },
# else /* UL_GFILLIM */
{ "file(blocks)", ULIMIT, 1, 2, 1, 'f' },
# endif /* UL_GFILLIM */
# endif /* UL_GETFSIZE */
#endif /* RLIMIT_FSIZE */
#ifdef RLIMIT_CORE
{ "coredump(blocks)", RLIMIT, RLIMIT_CORE, RLIMIT_CORE, 512, 'c' },
#endif
#ifdef RLIMIT_DATA
{ "data(kbytes)", RLIMIT, RLIMIT_DATA, RLIMIT_DATA, 1024, 'd' },
#endif
#ifdef RLIMIT_STACK
{ "stack(kbytes)", RLIMIT, RLIMIT_STACK, RLIMIT_STACK, 1024, 's' },
#endif
#ifdef RLIMIT_MEMLOCK
{ "lockedmem(kbytes)", RLIMIT, RLIMIT_MEMLOCK, RLIMIT_MEMLOCK, 1024, 'l' },
#endif
#ifdef RLIMIT_RSS
{ "memory(kbytes)", RLIMIT, RLIMIT_RSS, RLIMIT_RSS, 1024, 'm' },
#endif
#ifdef RLIMIT_NOFILE
{ "nofiles(descriptors)", RLIMIT, RLIMIT_NOFILE, RLIMIT_NOFILE, 1, 'n' },
#else /* RLIMIT_NOFILE */
# ifdef UL_GDESLIM /* svr4/xenix */
{ "nofiles(descriptors)", ULIMIT, UL_GDESLIM, -1, 1, 'n' },
# endif /* UL_GDESLIM */
#endif /* RLIMIT_NOFILE */
#ifdef RLIMIT_NPROC
{ "processes", RLIMIT, RLIMIT_NPROC, RLIMIT_NPROC, 1, 'p' },
#endif
#ifdef RLIMIT_VMEM
{ "vmemory(kbytes)", RLIMIT, RLIMIT_VMEM, RLIMIT_VMEM, 1024, 'v' },
#else /* RLIMIT_VMEM */
/* These are not quite right - really should subtract etext or something */
# ifdef UL_GMEMLIM /* svr4/xenix */
{ "vmemory(maxaddr)", ULIMIT, UL_GMEMLIM, -1, 1, 'v' },
# else /* UL_GMEMLIM */
# ifdef UL_GETBREAK /* osf/1 */
{ "vmemory(maxaddr)", ULIMIT, UL_GETBREAK, -1, 1, 'v' },
# else /* UL_GETBREAK */
# ifdef UL_GETMAXBRK /* hpux */
{ "vmemory(maxaddr)", ULIMIT, UL_GETMAXBRK, -1, 1, 'v' },
# endif /* UL_GETMAXBRK */
# endif /* UL_GETBREAK */
# endif /* UL_GMEMLIM */
#endif /* RLIMIT_VMEM */
#ifdef RLIMIT_SWAP
{ "swap(kbytes)", RLIMIT_SWAP, RLIMIT_SWAP, 1024, 'w' },
#endif
{ (char *) 0 }
};
static char options[3 + NELEM(limits)];
rlim_t UNINITIALIZED(val);
int how = SOFT | HARD;
const struct limits *l;
int set, all = 0;
int optc, what;
#ifdef HAVE_SETRLIMIT
struct rlimit limit;
#endif /* HAVE_SETRLIMIT */
if (!options[0]) {
/* build options string on first call - yuck */
char *p = options;
*p++ = 'H'; *p++ = 'S'; *p++ = 'a';
for (l = limits; l->name; l++)
*p++ = l->option;
*p = '\0';
}
what = 'f';
while ((optc = ksh_getopt(wp, &builtin_opt, options)) != EOF)
switch (optc) {
case 'H':
how = HARD;
break;
case 'S':
how = SOFT;
break;
case 'a':
all = 1;
break;
case '?':
return 1;
default:
what = optc;
}
for (l = limits; l->name && l->option != what; l++)
;
if (!l->name) {
internal_errorf(0, "ulimit: %c", what);
return 1;
}
wp += builtin_opt.optind;
set = *wp ? 1 : 0;
if (set) {
if (all || wp[1]) {
bi_errorf("too many arguments");
return 1;
}
if (strcmp(wp[0], "unlimited") == 0)
val = KSH_RLIM_INFINITY;
else {
long rval;
if (!evaluate(wp[0], &rval, KSH_RETURN_ERROR))
return 1;
/* Avoid problems caused by typos that
* evaluate misses due to evaluating unset
* parameters to 0...
* If this causes problems, will have to
* add parameter to evaluate() to control
* if unset params are 0 or an error.
*/
if (!rval && !digit(wp[0][0])) {
bi_errorf("invalid limit: %s", wp[0]);
return 1;
}
val = rval * l->factor;
}
}
if (all) {
for (l = limits; l->name; l++) {
#ifdef HAVE_SETRLIMIT
if (l->which == RLIMIT) {
getrlimit(l->gcmd, &limit);
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
} else
#endif /* HAVE_SETRLIMIT */
#ifdef HAVE_ULIMIT
{
val = ulimit(l->gcmd, (rlim_t) 0);
}
#else /* HAVE_ULIMIT */
;
#endif /* HAVE_ULIMIT */
shprintf("%-20s ", l->name);
#ifdef RLIM_INFINITY
if (val == RLIM_INFINITY)
shprintf("unlimited\n");
else
#endif /* RLIM_INFINITY */
{
val /= l->factor;
shprintf("%ld\n", (long) val);
}
}
return 0;
}
#ifdef HAVE_SETRLIMIT
if (l->which == RLIMIT) {
getrlimit(l->gcmd, &limit);
if (set) {
if (how & SOFT)
limit.rlim_cur = val;
if (how & HARD)
limit.rlim_max = val;
if (setrlimit(l->scmd, &limit) < 0) {
if (errno == EPERM)
bi_errorf("exceeds allowable limit");
else
bi_errorf("bad limit: %s",
strerror(errno));
return 1;
}
} else {
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
}
} else
#endif /* HAVE_SETRLIMIT */
#ifdef HAVE_ULIMIT
{
if (set) {
if (l->scmd == -1) {
bi_errorf("can't change limit");
return 1;
} else if (ulimit(l->scmd, val) < 0) {
bi_errorf("bad limit: %s", strerror(errno));
return 1;
}
} else
val = ulimit(l->gcmd, (rlim_t) 0);
}
#else /* HAVE_ULIMIT */
;
#endif /* HAVE_ULIMIT */
if (!set) {
#ifdef RLIM_INFINITY
if (val == RLIM_INFINITY)
shprintf("unlimited\n");
else
#endif /* RLIM_INFINITY */
{
val /= l->factor;
shprintf("%ld\n", (long) val);
}
}
return 0;
}