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utils-std

Collection of commonly available Unix tools git clone https://anongit.hacktivis.me/git/utils-std.git/

time.c (3589B)

    

  1. // utils-std: Collection of commonly available Unix tools
  2. // SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
  3. // SPDX-License-Identifier: MPL-2.0
  5. #define _POSIX_C_SOURCE 200809L
  6. #include "../libutils/getopt_nolong.h"
  8. #include <errno.h>
  9. #include <spawn.h>
  10. #include <stdio.h>        // perror, fprintf
  11. #include <stdlib.h>       // abort
  12. #include <string.h>       // strerror
  13. #include <sys/resource.h> // getrusage
  14. #include <sys/times.h>
  15. #include <sys/wait.h> // waitpid
  16. #include <unistd.h>   // sysconf, getopt
  18. extern char **environ;
  20. const char *argv0 = "time";
  22. enum cmd_time_mode
  23. {
  24. 	CMD_TIME_POSIX = 0,
  25. 	CMD_TIME_VERBOSE = 1,
  26. };
  28. static void
  29. usage(void)
  30. {
  31. 	fprintf(stderr, "Usage: time [-p|-v] command [argument ...]\n");
  32. }
  34. int
  35. main(int argc, char *argv[])
  36. {
  37. 	struct tms tms;
  38. 	int ret = 0;
  39. 	enum cmd_time_mode mode = CMD_TIME_POSIX;
  41. 	if(argc <= 1)
  42. 	{
  43. 		usage();
  44. 		return 0;
  45. 	}
  47. 	for(int c = -1; (c = getopt_nolong(argc, argv, ":pv")) != -1;)
  48. 	{
  49. 		switch(c)
  50. 		{
  51. 		case 'p': // POSIX format (default)
  52. 			mode = CMD_TIME_POSIX;
  53. 			break;
  54. 		case 'v':
  55. 			mode = CMD_TIME_VERBOSE;
  56. 			break;
  57. 		case ':':
  58. 			fprintf(stderr, "time: error: Missing operand for option: '-%c'\n", optopt);
  59. 			usage();
  60. 			return 1;
  61. 		case '?':
  62. 			GETOPT_UNKNOWN_OPT
  63. 			usage();
  64. 			return 1;
  65. 		}
  66. 	}
  68. 	argc -= optind;
  69. 	argv += optind;
  70. 	(void)argc;
  72. 	long ticks = sysconf(_SC_CLK_TCK);
  73. 	if(ticks <= 0)
  74. 	{
  75. 		perror("time: error: sysconf(_SC_CLK_TCK)");
  76. 		return 1;
  77. 	}
  79. 	clock_t t0 = times(&tms);
  80. 	if(t0 == (clock_t)-1)
  81. 	{
  82. 		perror("time: error: times");
  83. 		return 1;
  84. 	}
  86. 	pid_t child = -1;
  87. 	if(posix_spawnp(&child, argv[0], NULL, NULL, argv, environ) != 0)
  88. 	{
  89. 		ret = 126 + (errno == ENOENT);
  90. 		fprintf(stderr, "time: error: Failed executing '%s': %s\n", argv[0], strerror(errno));
  91. 		return ret;
  92. 	}
  94. 	int status = 0;
  95. 	waitpid(child, &status, 0);
  97. 	int t1 = times(&tms);
  98. 	if(t1 == (clock_t)-1)
  99. 	{
  100. 		perror("time: error: times");
  101. 		return 1;
  102. 	}
  104. 	if(WIFSIGNALED(status))
  105. 	{
  106. 		fprintf(stderr, "time: error: Command terminated by signal %d\n", WTERMSIG(status));
  107. 		ret = 128 + WTERMSIG(status);
  108. 	}
  110. 	struct rusage usage;
  111. 	if(getrusage(RUSAGE_CHILDREN, &usage) != 0)
  112. 	{
  113. 		fprintf(
  114. 		    stderr, "time: error: Failed getting resource usage of children: %s\n", strerror(errno));
  115. 		return 1;
  116. 	}
  118. 	double utime_s = usage.ru_utime.tv_sec + (usage.ru_utime.tv_usec * 0.000001);
  119. 	double stime_s = usage.ru_stime.tv_sec + (usage.ru_stime.tv_usec * 0.000001);
  121. 	switch(mode)
  122. 	{
  123. 	case CMD_TIME_POSIX:
  124. 		fprintf(stderr, "real %f\nuser %f\nsys %f\n", (t1 - t0) / (double)ticks, utime_s, stime_s);
  125. 		break;
  126. 	case CMD_TIME_VERBOSE:
  127. 		fprintf(stderr, "\tExecutable: %s\n", argv[0]);
  128. 		fprintf(stderr, "\tReal time  : %06f\n", (t1 - t0) / (double)ticks);
  129. 		fprintf(stderr, "\tUser time  : %06f\n", utime_s);
  130. 		fprintf(stderr, "\tSystem time: %06f\n", stime_s);
  131. #ifdef __linux__
  132. 		fprintf(stderr, "\tMaximum resident set size (maxrss): %ld kB\n", usage.ru_maxrss);
  133. 		fprintf(stderr, "\tMinor (no I/O required) page faults (minflt): %ld\n", usage.ru_minflt);
  134. 		fprintf(stderr, "\tMajor (I/O required) page faults (majflt): %ld\n", usage.ru_majflt);
  135. 		fprintf(stderr, "\tMajor (I/O required) page faults (majflt): %ld\n", usage.ru_majflt);
  136. 		fprintf(stderr, "\tVoluntary context switch (nvcsw): %ld\n", usage.ru_nvcsw);
  137. 		fprintf(stderr, "\tInvoluntary context switch (nivcsw): %ld\n", usage.ru_nivcsw);
  138. #endif
  140. 		if(WIFEXITED(status)) fprintf(stderr, "\tExit status: %d\n", WEXITSTATUS(status));
  142. 		break;
  143. 	default:
  144. 		abort();
  145. 	}
  147. 	if(WIFEXITED(status))
  148. 	{
  149. 		ret = WEXITSTATUS(status);
  150. 	}
  152. 	return ret;
  153. }