diff options
Diffstat (limited to 'src/nice.c')
-rw-r--r-- | src/nice.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/nice.c b/src/nice.c new file mode 100644 index 000000000..4911fcc70 --- /dev/null +++ b/src/nice.c @@ -0,0 +1,150 @@ +/* nice -- run a program with modified scheduling priority + Copyright (C) 1990, 1991 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* David MacKenzie <djm@ai.mit.edu> */ + +#include <stdio.h> +#include <getopt.h> +#include <sys/types.h> +#ifndef NICE_PRIORITY +#include <sys/time.h> +#include <sys/resource.h> +#endif +#include "system.h" + +int isinteger (); +void error (); +void usage (); + +/* The name this program was run with. */ +char *program_name; + +struct option longopts[] = +{ + {"adjustment", 1, NULL, 'n'}, + {NULL, 0, NULL, 0} +}; + +void +main (argc, argv) + int argc; + char **argv; +{ + int current_priority; + int adjustment = 0; + int minusflag = 0; + int adjustment_given = 0; + int optc; + + program_name = argv[0]; + + while ((optc = getopt_long (argc, argv, "+0123456789-n:", longopts, + (int *) 0)) != EOF) + { + switch (optc) + { + case '?': + usage (); + + case 'n': + if (!isinteger (optarg)) + error (1, 0, "invalid priority `%s'", optarg); + adjustment = atoi (optarg); + adjustment_given = 1; + break; + + case '-': + minusflag = 1; + break; + + default: + adjustment = adjustment * 10 + optc - '0'; + adjustment_given = 1; + } + } + + if (minusflag) + adjustment = -adjustment; + if (!adjustment_given) + adjustment = 10; + + if (optind == argc) + { + if (adjustment_given) + usage (); + /* No command given; print the priority. */ + errno = 0; +#ifndef NICE_PRIORITY + current_priority = getpriority (PRIO_PROCESS, 0); +#else + current_priority = nice (0); +#endif + if (current_priority == -1 && errno != 0) + error (1, errno, "cannot get priority"); + printf ("%d\n", current_priority); + exit (0); + } + + errno = 0; +#ifndef NICE_PRIORITY + current_priority = getpriority (PRIO_PROCESS, 0); +#else + current_priority = nice (0); +#endif + if (current_priority == -1 && errno != 0) + error (1, errno, "cannot get priority"); + +#ifndef NICE_PRIORITY + if (setpriority (PRIO_PROCESS, 0, current_priority + adjustment)) +#else + if (nice (adjustment) == -1) +#endif + error (1, errno, "cannot set priority"); + + execvp (argv[optind], &argv[optind]); + error (errno == ENOENT ? 127 : 126, errno, "%s", argv[optind]); +} + +/* Return nonzero if S represents a (possibly signed) decimal integer, + zero if not. */ + +int +isinteger (s) + char *s; +{ + if (*s == '-') + ++s; + if (*s == 0) + return 0; + while (*s) + { + if (*s < '0' || *s > '9') + return 0; + ++s; + } + return 1; +} + +void +usage () +{ + fprintf (stderr, "\ +Usage: %s [-n adjustment] [-adjustment] [--adjustment=adjustment]\n\ + [command [arg...]]\n", + program_name); + exit (1); +} |