/* $OpenBSD: c_ulimit.c,v 1.29 2019/06/28 13:34:59 deraadt Exp $ */ /* ulimit -- handle "ulimit" builtin Reworked to use getrusage() and ulimit() at once (as needed on some schizophrenic 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 #include #include #include #include #include "sh.h" #define SOFT 0x1 #define HARD 0x2 struct limits { const char *name; int resource; /* resource to get/set */ int factor; /* multiply by to get rlim_{cur,max} values */ char option; /* option character (-d, -f, ...) */ }; static void print_ulimit(const struct limits *, int); static int set_ulimit(const struct limits *, const char *, int); int c_ulimit(char **wp) { static const struct limits limits[] = { /* Do not use options -H, -S or -a or change the order. */ { "time(cpu-seconds)", RLIMIT_CPU, 1, 't' }, { "file(blocks)", RLIMIT_FSIZE, 512, 'f' }, { "coredump(blocks)", RLIMIT_CORE, 512, 'c' }, { "data(kbytes)", RLIMIT_DATA, 1024, 'd' }, { "stack(kbytes)", RLIMIT_STACK, 1024, 's' }, { "lockedmem(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' }, { "memory(kbytes)", RLIMIT_RSS, 1024, 'm' }, { "nofiles(descriptors)", RLIMIT_NOFILE, 1, 'n' }, { "processes", RLIMIT_NPROC, 1, 'p' }, { NULL } }; const char *options = "HSat#f#c#d#s#l#m#n#p#"; int how = SOFT | HARD; const struct limits *l; int optc, all = 0; /* First check for -a, -H and -S. */ while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1) switch (optc) { case 'H': how = HARD; break; case 'S': how = SOFT; break; case 'a': all = 1; break; case '?': return 1; default: break; } if (wp[builtin_opt.optind] != NULL) { bi_errorf("usage: ulimit [-acdfHlmnpSst] [value]"); return 1; } /* Then parse and act on the actual limits, one at a time */ ksh_getopt_reset(&builtin_opt, GF_ERROR); while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1) switch (optc) { case 'a': case 'H': case 'S': break; case '?': return 1; default: for (l = limits; l->name && l->option != optc; l++) ; if (!l->name) { internal_warningf("%s: %c", __func__, optc); return 1; } if (builtin_opt.optarg) { if (set_ulimit(l, builtin_opt.optarg, how)) return 1; } else print_ulimit(l, how); break; } wp += builtin_opt.optind; if (all) { for (l = limits; l->name; l++) { shprintf("%-20s ", l->name); print_ulimit(l, how); } } else if (builtin_opt.optind == 1) { /* No limit specified, use file size */ l = &limits[1]; if (wp[0] != NULL) { if (set_ulimit(l, wp[0], how)) return 1; wp++; } else { print_ulimit(l, how); } } return 0; } static int set_ulimit(const struct limits *l, const char *v, int how) { rlim_t val = 0; struct rlimit limit; if (strcmp(v, "unlimited") == 0) val = RLIM_INFINITY; else { int64_t rval; if (!evaluate(v, &rval, KSH_RETURN_ERROR, false)) 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(v[0])) { bi_errorf("invalid limit: %s", v); return 1; } val = (rlim_t)rval * l->factor; } getrlimit(l->resource, &limit); if (how & SOFT) limit.rlim_cur = val; if (how & HARD) limit.rlim_max = val; if (setrlimit(l->resource, &limit) == -1) { if (errno == EPERM) bi_errorf("-%c exceeds allowable limit", l->option); else bi_errorf("bad -%c limit: %s", l->option, strerror(errno)); return 1; } return 0; } static void print_ulimit(const struct limits *l, int how) { rlim_t val = 0; struct rlimit limit; getrlimit(l->resource, &limit); if (how & SOFT) val = limit.rlim_cur; else if (how & HARD) val = limit.rlim_max; if (val == RLIM_INFINITY) shprintf("unlimited\n"); else { val /= l->factor; shprintf("%" PRIi64 "\n", (int64_t) val); } }