home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1989, 1995, 1996, 1997 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* gp_unix.c */
- /* Unix-specific routines for Ghostscript */
- #include "string_.h"
- #include "time_.h"
- #include "gx.h"
- #include "gsexit.h"
- #include "gp.h"
-
- /*
- * Because of inconsistent (and sometimes incorrect) header files,
- * we must omit the argument list for popen.
- */
- extern FILE *popen( /* P2(const char *, const char *) */ );
- extern int pclose(P1(FILE *));
- /*
- * This is the only place in Ghostscript that calls 'exit'. Including
- * <stdlib.h> is overkill, but that's where it's declared on ANSI systems.
- * We don't have any way of detecting whether we have a standard library
- * (some GNU compilers perversely define __STDC__ but don't provide
- * an ANSI-compliant library), so we check __PROTOTYPES__ and
- * hope for the best. We pick up getenv at the same time.
- */
- #ifdef __PROTOTYPES__
- # include <stdlib.h> /* for exit and getenv */
- #else
- extern void exit(P1(int));
- extern char *getenv(P1(const char *));
- #endif
-
- /* Do platform-dependent initialization. */
- void
- gp_init(void)
- {
- }
-
- /* Do platform-dependent cleanup. */
- void
- gp_exit(int exit_status, int code)
- {
- }
-
- /* Exit the program. */
- void
- gp_do_exit(int exit_status)
- { exit(exit_status);
- }
-
- /* ------ Miscellaneous ------ */
-
- /* Get the string corresponding to an OS error number. */
- /* Unix systems support this so inconsistently that we don't attempt */
- /* to figure out whether it's available. */
- const char *
- gp_strerror(int errnum)
- { return NULL;
- }
-
- /* ------ Date and time ------ */
-
- /* Read the current time (in seconds since Jan. 1, 1970) */
- /* and fraction (in nanoseconds). */
- void
- gp_get_realtime(long *pdt)
- { struct timeval tp;
-
- #if gettimeofday_no_timezone /* older versions of SVR4 */
- { if ( gettimeofday(&tp) == -1 )
- { lprintf("Ghostscript: gettimeofday failed!\n");
- gs_exit(1);
- }
- }
- #else /* All other systems */
- { struct timezone tzp;
- if ( gettimeofday(&tp, &tzp) == -1 )
- { lprintf("Ghostscript: gettimeofday failed!\n");
- gs_exit(1);
- }
- }
- #endif
-
- /* tp.tv_sec is #secs since Jan 1, 1970 */
- pdt[0] = tp.tv_sec;
-
- /* Some Unix systems (e.g., Interactive 3.2 r3.0) return garbage */
- /* in tp.tv_usec. Try to filter out the worst of it here. */
- pdt[1] = tp.tv_usec >= 0 && tp.tv_usec < 1000000 ? tp.tv_usec*1000 : 0;
-
- #ifdef DEBUG_CLOCK
- printf("tp.tv_sec = %d tp.tv_usec = %d pdt[0] = %ld pdt[1] = %ld\n",
- tp.tv_sec, tp.tv_usec, pdt[0], pdt[1]);
- #endif
- }
-
- /* Read the current user CPU time (in seconds) */
- /* and fraction (in nanoseconds). */
- void
- gp_get_usertime(long *pdt)
- {
- #if use_times_for_usertime
- struct tms tms;
- long ticks;
-
- static long ticks_per_sec = 0;
- if ( !ticks_per_sec ) /* not initialized yet */
- ticks_per_sec = CLK_TCK;
-
- times(&tms);
- ticks = tms.tms_utime + tms.tms_stime + tms.tms_cutime + tms.tms_cstime;
- pdt[0] = ticks / ticks_per_sec;
- pdt[1] = (ticks % ticks_per_sec) * (1000000000 / ticks_per_sec);
- #else
- gp_get_realtime(pdt); /* Use an approximation on other hosts. */
- #endif
- }
-
- /* ------ Screen management ------ */
-
- /* Get the environment variable that specifies the display to use. */
- const char *
- gp_getenv_display(void)
- { return getenv("DISPLAY");
- }
-
- /* ------ Printer accessing ------ */
-
- /* Open a connection to a printer. A null file name means use the */
- /* standard printer connected to the machine, if any. */
- /* "|command" opens an output pipe. */
- /* Return NULL if the connection could not be opened. */
- FILE *
- gp_open_printer(char *fname, int binary_mode)
- { return
- (strlen(fname) == 0 ?
- gp_open_scratch_file(gp_scratch_file_name_prefix, fname, "w") :
- fname[0] == '|' ?
- popen(fname + 1, "w") :
- fopen(fname, "w"));
- }
-
- /* Close the connection to the printer. */
- void
- gp_close_printer(FILE *pfile, const char *fname)
- { if ( fname[0] == '|' )
- pclose(pfile);
- else
- fclose(pfile);
- }
-