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 1.5 2001/04/08 08:43:24 ghostgum 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 } 61 62 /* ------ Miscellaneous ------ */ 63 64 /* Get the string corresponding to an OS error number. */ 65 /* Unix systems support this so inconsistently that we don't attempt */ 66 /* to figure out whether it's available. */ 67 const char * 68 gp_strerror(int errnum) 69 { 70 return NULL; 71 } 72 73 /* ------ Date and time ------ */ 74 75 /* Read the current time (in seconds since Jan. 1, 1970) */ 76 /* and fraction (in nanoseconds). */ 77 void 78 gp_get_realtime(long *pdt) 79 { 80 struct timeval tp; 81 82 #if gettimeofday_no_timezone /* older versions of SVR4 */ 83 { 84 if (gettimeofday(&tp) == -1) { 85 lprintf("Ghostscript: gettimeofday failed!\n"); 86 tp.tv_sec = tp.tv_usec = 0; 87 } 88 } 89 #else /* All other systems */ 90 { 91 struct timezone tzp; 92 93 if (gettimeofday(&tp, &tzp) == -1) { 94 lprintf("Ghostscript: gettimeofday failed!\n"); 95 tp.tv_sec = tp.tv_usec = 0; 96 } 97 } 98 #endif 99 100 /* tp.tv_sec is #secs since Jan 1, 1970 */ 101 pdt[0] = tp.tv_sec; 102 103 /* Some Unix systems (e.g., Interactive 3.2 r3.0) return garbage */ 104 /* in tp.tv_usec. Try to filter out the worst of it here. */ 105 pdt[1] = tp.tv_usec >= 0 && tp.tv_usec < 1000000 ? tp.tv_usec * 1000 : 0; 106 107 #ifdef DEBUG_CLOCK 108 printf("tp.tv_sec = %d tp.tv_usec = %d pdt[0] = %ld pdt[1] = %ld\n", 109 tp.tv_sec, tp.tv_usec, pdt[0], pdt[1]); 110 #endif 111 } 112 113 /* Read the current user CPU time (in seconds) */ 114 /* and fraction (in nanoseconds). */ 115 void 116 gp_get_usertime(long *pdt) 117 { 118 #if use_times_for_usertime 119 struct tms tms; 120 long ticks; 121 const long ticks_per_sec = CLK_TCK; 122 123 times(&tms); 124 ticks = tms.tms_utime + tms.tms_stime + tms.tms_cutime + tms.tms_cstime; 125 pdt[0] = ticks / ticks_per_sec; 126 pdt[1] = (ticks % ticks_per_sec) * (1000000000 / ticks_per_sec); 127 #else 128 gp_get_realtime(pdt); /* Use an approximation on other hosts. */ 129 #endif 130 } 131 132 /* ------ Screen management ------ */ 133 134 /* Get the environment variable that specifies the display to use. */ 135 const char * 136 gp_getenv_display(void) 137 { 138 return getenv("DISPLAY"); 139 } 140 141 /* ------ Printer accessing ------ */ 142 143 /* Open a connection to a printer. See gp.h for details. */ 144 FILE * 145 gp_open_printer(char fname[gp_file_name_sizeof], int binary_mode) 146 { 147 const char *fmode = (binary_mode ? "wb" : "w"); 148 149 return (strlen(fname) == 0 ? 0 : fopen(fname, fmode)); 150 } 151 152 /* Close the connection to the printer. */ 153 void 154 gp_close_printer(FILE * pfile, const char *fname) 155 { 156 if (fname[0] == '|') 157 pclose(pfile); 158 else 159 fclose(pfile); 160 } 161