1 /* Copyright (C) 1989, 2000 Aladdin Enterprises. All rights reserved. 2 3 This file is part of AFPL Ghostscript. 4 5 AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or 6 distributor accepts any responsibility for the consequences of using it, or 7 for whether it serves any particular purpose or works at all, unless he or 8 she says so in writing. Refer to the Aladdin Free Public License (the 9 "License") for full details. 10 11 Every copy of AFPL Ghostscript must include a copy of the License, normally 12 in a plain ASCII text file named PUBLIC. The License grants you the right 13 to copy, modify and redistribute AFPL Ghostscript, but only under certain 14 conditions described in the License. Among other things, the License 15 requires that the copyright notice and this notice be preserved on all 16 copies. 17 */ 18 19 /*$Id: gp_unix.c,v 1.3 2000/09/19 19:00:25 lpd Exp $ */ 20 /* Unix-specific routines for Ghostscript */ 21 #include "pipe_.h" 22 #include "string_.h" 23 #include "time_.h" 24 #include "gx.h" 25 #include "gsexit.h" 26 #include "gp.h" 27 28 /* 29 * This is the only place in Ghostscript that calls 'exit'. Including 30 * <stdlib.h> is overkill, but that's where it's declared on ANSI systems. 31 * We don't have any way of detecting whether we have a standard library 32 * (some GNU compilers perversely define __STDC__ but don't provide 33 * an ANSI-compliant library), so we check __PROTOTYPES__ and 34 * hope for the best. We pick up getenv at the same time. 35 */ 36 #ifdef __PROTOTYPES__ 37 # include <stdlib.h> /* for exit and getenv */ 38 #else 39 extern void exit(P1(int)); 40 extern char *getenv(P1(const char *)); 41 42 #endif 43 44 /* Do platform-dependent initialization. */ 45 void 46 gp_init(void) 47 { 48 } 49 50 /* Do platform-dependent cleanup. */ 51 void 52 gp_exit(int exit_status, int code) 53 { 54 } 55 56 /* Exit the program. */ 57 void 58 gp_do_exit(int exit_status) 59 { 60 exit(exit_status); 61 } 62 63 /* ------ Miscellaneous ------ */ 64 65 /* Get the string corresponding to an OS error number. */ 66 /* Unix systems support this so inconsistently that we don't attempt */ 67 /* to figure out whether it's available. */ 68 const char * 69 gp_strerror(int errnum) 70 { 71 return NULL; 72 } 73 74 /* ------ Date and time ------ */ 75 76 /* Read the current time (in seconds since Jan. 1, 1970) */ 77 /* and fraction (in nanoseconds). */ 78 void 79 gp_get_realtime(long *pdt) 80 { 81 struct timeval tp; 82 83 #if gettimeofday_no_timezone /* older versions of SVR4 */ 84 { 85 if (gettimeofday(&tp) == -1) { 86 lprintf("Ghostscript: gettimeofday failed!\n"); 87 gs_exit(1); 88 } 89 } 90 #else /* All other systems */ 91 { 92 struct timezone tzp; 93 94 if (gettimeofday(&tp, &tzp) == -1) { 95 lprintf("Ghostscript: gettimeofday failed!\n"); 96 gs_exit(1); 97 } 98 } 99 #endif 100 101 /* tp.tv_sec is #secs since Jan 1, 1970 */ 102 pdt[0] = tp.tv_sec; 103 104 /* Some Unix systems (e.g., Interactive 3.2 r3.0) return garbage */ 105 /* in tp.tv_usec. Try to filter out the worst of it here. */ 106 pdt[1] = tp.tv_usec >= 0 && tp.tv_usec < 1000000 ? tp.tv_usec * 1000 : 0; 107 108 #ifdef DEBUG_CLOCK 109 printf("tp.tv_sec = %d tp.tv_usec = %d pdt[0] = %ld pdt[1] = %ld\n", 110 tp.tv_sec, tp.tv_usec, pdt[0], pdt[1]); 111 #endif 112 } 113 114 /* Read the current user CPU time (in seconds) */ 115 /* and fraction (in nanoseconds). */ 116 void 117 gp_get_usertime(long *pdt) 118 { 119 #if use_times_for_usertime 120 struct tms tms; 121 long ticks; 122 const long ticks_per_sec = CLK_TCK; 123 124 times(&tms); 125 ticks = tms.tms_utime + tms.tms_stime + tms.tms_cutime + tms.tms_cstime; 126 pdt[0] = ticks / ticks_per_sec; 127 pdt[1] = (ticks % ticks_per_sec) * (1000000000 / ticks_per_sec); 128 #else 129 gp_get_realtime(pdt); /* Use an approximation on other hosts. */ 130 #endif 131 } 132 133 /* ------ Screen management ------ */ 134 135 /* Get the environment variable that specifies the display to use. */ 136 const char * 137 gp_getenv_display(void) 138 { 139 return getenv("DISPLAY"); 140 } 141 142 /* ------ Printer accessing ------ */ 143 144 /* Open a connection to a printer. See gp.h for details. */ 145 FILE * 146 gp_open_printer(char fname[gp_file_name_sizeof], int binary_mode) 147 { 148 const char *fmode = (binary_mode ? "wb" : "w"); 149 150 return (strlen(fname) == 0 ? 0 : fopen(fname, fmode)); 151 } 152 153 /* Close the connection to the printer. */ 154 void 155 gp_close_printer(FILE * pfile, const char *fname) 156 { 157 if (fname[0] == '|') 158 pclose(pfile); 159 else 160 fclose(pfile); 161 } 162