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1581. Makefile
. Next: static.c Up: Modular Example Previous: header.h . # # Makefile # SOURCES.c= main.c WriteMyString.c INCLUDES= CFLAGS= SLIBS= PROGRAM= main OBJECTS= $(SOURCES.c:.c=.o) .KEEP_STATE: debug := CFLAGS= -g all debug: $(PROGRAM) $(PROGRAM): $(INCLUDES) $(OBJECTS) $(LINK.c) -o $@ $(OBJECTS) $(SLIBS) clean: rm -f $(PROGRAM) $(OBJECTS) . Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_22_11_4.html -- 2.1 Кб -- 02.10.2012
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1582. header.h
. Next: Makefile Up: Modular Example Previous: WriteMyString.c . /* * header.h */ #define MY_STRING "Hello World" void WriteMyString(); . Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_22_11_3.html -- 2.0 Кб -- 02.10.2012
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1583. WriteMyString.c
. Next: header.h Up: Modular Example Previous: main.c . /* * WriteMyString.c */ extern char *AnotherString; void WriteMyString(ThisString) char *ThisString; { printf("%s\n", ThisString); printf("Global Variable = %s\n", AnotherString); } . Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_22_11_2.html -- 2.1 Кб -- 02.10.2012
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1584. main.c
. Next: WriteMyString.c Up: Modular Example Previous: Modular Example . /* * main.c */ #include "header.h" #include <stdio.h> char *AnotherString = "Hello Everyone"; main() { printf("Running...\n"); /* * Call WriteMyString() - defined in another file */ WriteMyString(MY_STRING); printf("Finished.\n"); } . Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_22_11_1.html -- 2.2 Кб -- 02.10.2012
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1585. Linux I/O port programming mini-HOWTO
Next Previous Contents . v3.0, 2000-12-13 . This HOWTO document describes programming hardware I/O ports and waiting for small periods of time in user-mode Linux programs running on the Intel x86 architecture. 2.1 The normal method . 2.2 An alternate method: /dev/port . 4.1 Delays . 4.2 Measuring time . 6.1 The parallel port . 6.2 The game (joystick) port . 6.3 The serial port . Next Previous Contents
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Ссылки http://jet.sao.ru/hq/sts/linux/doc/io-portprog/IO-Port-Programming.html -- 3.2 Кб -- 02.10.2012
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1586. Low level I/O
... include stdio.h and may also need some of # include stdarg.h , # include sys/types.h , # include sys/stat.h , # include fcntl.h . int close ( int handle ) - Close a file opened for unbuffered I/O. int creat( char *filename, int pmode ) - Create a new file with specified permission setting. int eof ( int handle ) - Check for end of file . long lseek( ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_21_6_2.html -- 2.6 Кб -- 02.10.2012
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1587. Stream 1/0
... int feof(FlLE *file_pointer) - Check if end of file occurred on a stream. int ferror(FlLE *file_pointer) - Check if any error occurred during file I/0. int fflush(FlLE *file_pointer) - Write out (flush) buffer to file. int fgetc(FlLE *file_pointer) - Get a character from a stream. int fgetpos(FlLE *file_pointer, fpos_t current_pos) - Get the current position in a stream. char *fgets(char *string, int maxchar, FILE *file_pointer) - Read a string from a file. ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_21_6_1.html -- 4.9 Кб -- 02.10.2012
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1588. Interrupts and Signals
Next: Sending Signals - kill() Up: Process Control and Management Previous: pipe() - Low level Piping . ... When a process terminates abnormally it usually tries to send a signal indicating what went wrong. ... The process uses signals which can be numbered 0 to 31. Macros are defined in signal.h header file for common signals. ... Sending Signals - kill() . Receiving signals - signal() . ... Wed Sep 14 10:06:31 BST 1994 ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_18_4_3.html -- 2.7 Кб -- 02.10.2012
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1589. Piping in a C program
Next: popen() - Formatted Piping Up: Process Control and Management Previous: exit() . Piping is a process where the input of one process is made the input of another. We have seen examples of this from the UNIX command line using . We will now see how we do this from C programs. We will have two (or more) forked processes and will communicate between them. ... UNIX allows two ways of opening a pipe. popen() - Formatted Piping . ... Wed Sep 14 10:06:31 BST 1994 ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_18_4_2.html -- 2.6 Кб -- 02.10.2012
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1590. Running UNIX Commands from C
Next: execl() Up: Process Control and Management Previous: Process Control and Management . We can run commands from a C program just as if they were from the UNIX command line by using the system() function. ... System returns the exit status of the shell. Example: Call ls from a program . system is a call that is made up of 3 other commands: execl(), wait() and fork() . execl() . fork() . ... exit() . ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_18_4_1.html -- 3.0 Кб -- 02.10.2012
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1591. errno
Next: Process Control and Management Up: File and Directory Manipulation Previous: File Manipulation Routines . ... extern int errno; . It can be manually reset within a C program other wise it simply retains its last value. int chmod(char *path, int mode) change the mode of access of a file. specified by path to the given mode . ... Leftmost bit = read access (on/off) middle is write, right is executable. ... int stat(char *path, struct stat *buf), int fstat(int fd, struct stat *buf) . ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_18_3_3.html -- 5.1 Кб -- 02.10.2012
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1592. File Manipulation Routines
Next: errno Up: File and Directory Manipulation Previous: Directory handling functions . int access(char *path, int mode) - determine accessibility of file. path points to a path name naming a file. access() checks the named file for accessibility according to mode , defined in #include <unistd.h> : . ... test whether the directories leading to the file can be searched and the file exists. access() returns: 0 on success, -1 on failure and sets errno to indicate the error. ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_18_3_2.html -- 2.6 Кб -- 02.10.2012
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1593. Directory handling functions
Next: File Manipulation Routines Up: File and Directory Manipulation Previous: File and Directory Manipulation . This basically involves calling appropriate functions. int chdir(char path) - changes directory to specified path string. ... NOTE: rindex() is a string handling function that returns a pointer to the last occurrence of character c in string s , or a NULL pointer if c does not occur in the string. ( index() is similar function but assigns a pointer to 1st occurrence.) ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_18_3_1.html -- 5.6 Кб -- 02.10.2012
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1594. comedi_trigger
. Comedi Documentation . Prev . Next . comedi_trigger -- perform streaming input/output (deprecated) . #include <comedilib.h> . int comedi_trigger (comedi_t * device, comedi_trig * trig); . deprecated . The function comedi_trigger() instructs Comedi to perform the command specified by the trigger structure trig. The return value depends on the particular trig being issued. If there is an error, -1 is returned. Prev . Home . Next . comedi_set_buffer_size . Up . comedi_do_insnlist
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Ссылки http://jet.sao.ru/hq/sts/linux/comedi/doc/func-ref-comedi-trigger.html -- 3.9 Кб -- 02.10.2012
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1595. comedi_to_phys
... double comedi_to_phys (lsampl_t data, comedi_range * range, lsampl_t maxdata); . Converts data given in sample values (lsampl_t, between 0 and maxdata) into physical units (double). The parameter range represents the conversion information to use, and the parameter maxdata represents the maximum possible data value for the channel that the data was read. Conversion of endpoint sample values, that is, sample values equal to 0 or maxdata, is affected by the Comedilib out-of-range behavior. ...
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Ссылки http://jet.sao.ru/hq/sts/linux/comedi/doc/func-ref-comedi-to-phys.html -- 4.2 Кб -- 02.10.2012
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1596. comedi_sv_init
Comedi Documentation . ... Next . comedi_sv_init -- slowly-varying inputs . ... int comedi_sv_init (comedi_sv_t * sv, comedi_t * device, unsigned int subdevice, unsigned int channel); . The function comedi_sv_init() initializes the slow varying Comedi structure sv to use the device device, the analog input subdevice subdevice, and the channel channel. The slow varying Comedi structure is used by comedi_sv_measure() to accurately measure an analog input by averaging over many samples. ...
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Ссылки http://jet.sao.ru/hq/sts/linux/comedi/doc/func-ref-comedi-sv-init.html -- 3.9 Кб -- 02.10.2012
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1597. comedi_do_insn
Comedi Documentation . Prev . Next . comedi_do_insn -- perform instruction . ... int comedi_do_insn (comedi_t * device, comedi_insn * instruction); . The function comedi_do_insn() performs a single instruction. If sucessful, comedi_do_insn() returns the number of samples measured, which may be less than the number of requested samples. Comedi limits the number of requested samples in order to enforce fairness among processes. ... comedi_do_insnlist . ... comedi_lock ...
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Ссылки http://jet.sao.ru/hq/sts/linux/comedi/doc/func-ref-comedi-do-insn.html -- 3.8 Кб -- 02.10.2012
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1598. comedi_command
... Prev . Next . comedi_command -- start streaming input/output . ... int comedi_command (comedi_t * device, comedi_cmd * command); . The function comedi_command() starts streaming input or output. The command structure pointed to by the parameter command specifies the acquisition. For input subdevices, sample values are read using the function read(). For output subdevices, sample vlaues are written using the function write(). ... comedi_command_test ...
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Ссылки http://jet.sao.ru/hq/sts/linux/comedi/doc/func-ref-comedi-command.html -- 3.8 Кб -- 02.10.2012
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1599. General points
. Next: Conclusions Up: The command line interface (TEXT CEILIDH ONLY) Previous: Advantages of the command line interface . At certain times, the teacher may close a complete course, or a unit, or an exercise. These perhaps represent parts of the course which are under development, or which must be kept unmodified for administrative reasons. Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_19_4_2.html -- 2.1 Кб -- 02.10.2012
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1600. Advantages of the command line interface
Next: General points Up: The command line interface (TEXT CEILIDH ONLY) Previous: The command line interface (TEXT CEILIDH ONLY) . With this interface, you can execute other non-Ceilidh commands or even log out at any point. When you resume, the course, unit and exercise will remain set just as when you last issued a Ceilidh command (although you may choose to execute "status" to check the settings). ... commands . to remind yourself of the commands currently available. The command . ...
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Ссылки http://jet.sao.ru/hq/sts/linux/book/c_marshall/subsection2_19_4_1.html -- 3.0 Кб -- 02.10.2012
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