怎样判断一个c函数是posix的？

2014-07-05 07:55:38 472 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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POSIX（包含程序的可移植性） -- 详解 POSIX 标准包含了进程管理、文件管理、网络通信、线程和同步、信号处理等方面的功能。这些接口定义了函数、数据类型和常量等，为开发者提供了一个可移植的方法来与操作系统进行交互。阅读详情

linux 下怎样判断一个c函数是posix的，通过man 查看conforming to？
如果自己写的程序要想有很好的移植性，是不是都得使用posix的？
以前写东西没考虑过移植性的问题，欢迎各种解答和喷。

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Intel0011 2014-07-06

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mktime()—Converts time formats 363 modf()—Breaks a value into integral and fractional parts 364 open()—Opens a file 365 opendir()—Opens a directory 367 pathconf()—Gets configuration variables for a path 368 pause()—Suspends process execution 370 perror()—Prints an error message 371 pipe()—Creates an interprocess channel 372 pow()—Computes x raised to the power y 373 printff()—Writes formatted text to the standard output stream 374 putc()—Writes a character to a stream 378 putchar()—Writes a character to standard output 379 puts( )—Writes a string to standard output 380 qsort()—Sorts an array 381 raise()—Sends a signal 383 rand()—Retums a random number 384 read()—Reads from a file 385 readdir()—Reads a directory 387 realloc()—Changes the size of a memory object 389 remove()—Removes a file from a directory 390 rename()—Renames a file 391 rewind()—Sets the file position to the beginning of the file 393 rewinddir()—Resets the readdir() pointer 394 rmdir()—Removes a directory 395 scanf()—Reads formatted text from standard input stream 396 setbuf()—Determines how a stream will be buffered 400 setgid()—Sets group ID 401 setjmp()—Saves the calling environment for use by longjmp() 403 setlocale()—Sets or queries a program's locale 405 setpgid()—Sets process group ID for job control 406 setsid()—Creates a session and sets the process group ID 407 setuid()—Sets the user ID 408 setvbuf()—Determines buffering for a stream 410 sigaction()—Examines and changes signal action 412 sigaddset()—Adds a signal to a signal set 414 sigdelset()—Removes a signal from a signal set 415 sigemptyset()—Creates an empty signal set 416 sigfillset()—Creates a full set of signals 417 sigismember()—Tests a signal set for a selected member 418 siglongjmp()—Goes to and restores signal mask 419 signal()—Specifies signal handling 420 sigpending()—Examines pending signals 422 sigprocmask()—Examines and changes blocked signals 423 sigsetjmp()—Saves state for siglongjmp() 425 sigsuspend()—Waits for a signal 427 sin()—Computes the sine function 428 sinh()—Computes the hyperbolic sine of x 429 sleep()—Delays process execution 430 sprintf()—Formats a string 431 sqrt()—Computes the square root function 435 srand()—Sets a seed for the rand() function 436 sscanf()—Parses a string 437 stat()—Gets information about a file 441 strcat()—Concatenates two strings 442 strchr()—Scans a string for a character 443 strcmp()—Compares two strings 444 strcoll()—Compares two strings using the current locale 445 strcpy()—Copies a string 446 strcspn()—Searches a string for characters which are not in the second string strerror()—Converts an error number to a string 448 strftime()—Formats date/time 449 strlen()—Computes the length of a string 451 strcat()—Concatenates two counted strings 452 strncmp()—Compares two counted strings 453 strncpy()—Copies a counted string 454 strpbrk()—Searches a string for any of a set of characters 455 strrchr()—Locates the last occurrence of a character in a string 456 strspn()—Searches a string for any of a set of characters 457 strstr()—Locates a substring 458 strtod()—Converts a string to double 459 strtok()—Breaks a string into tokens 461 strtol()—Converts a string to long int 462 strtoul()—Converts a string to unsigned long int 464 strxfrm()—Transforms strings using rules for locale 466 sysconf()—Gets system configuration information 468 system()—Executes a command 470 tan()—Computes the tangent of x 471 tanh()—Computes the hyperbolic tangent of x 472 tcdrain()—Waits for all output to be transmitted to the terminal 473 tcflow()—Suspends/restarts terminal output 474 tcflush()—Discards terminal data 476 tcgetattr()—Gets terminal attributes 477 tcgetpgrp()—Gets foreground process group ID 478 tcsendbreak()—Sends a break to a terminal 480 tcsetattr()—Sets terminal attributes 481 tcsetpgrp()—Sets foreground process group ID 483 time()—Determines the current calendar time 484 times()—Gets process times 485 tmpfile()—Creates a temporary file 486 tmpnam()—Generates a string that is a valid non-existing file name 487 tolower()—Converts uppercase to lowercase 488 toupper()—Converts lowercase to uppercase 489 ttyname()—Determines a terminal pathname 490 tzset()—Sets the timezone from environment variables 491 umask()—Sets a file creation mask 492 uname()—Gets system name 493 ungetc()—Pushes a character back onto a stream 495 unlink()—Removes a directory entry 496 utime()—Sets file access and modification times 497 va_arg()—Gets the next argument 499 va_end()—Ends variable argument list 501 va_start()—Starts a variable argument list 502 vfprintf()—Writes formatted text with a variable argument list 503 vprintf()—Write formatted text to standard output with a variable argument list vsprintf()—Write formatted text to a string with a variable argument list wait()—Waits for process termination 507 waitpid()—Waits for process termination 509 wcstombs()—Converts a wide character string to a multibyte character string wctomb()—Converts a wide character to a multibyte character 512 write()—Writes to a file

Intel0011 2014-07-06

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abort()— Causes abnormal process termination 211 abs()—Computes the absolute value of an integer 212 access()—Tests for file accessibility 213 acos()—Computes the principal value of arc cosine 215 alarm()—Schedules an alarm 216 asctime()—Converts a time structure to a string 217 asin()—Computes the principal value of the arc sine 218 assert()—Aborts the program if assertion is false 219 atan()—Computes the principal value of the arc tangent 221 atan2()—Computes the principal value of the arc tangent of y/x 222 atexit()—Registers a function to be called at normal program termination atof()—Converts a text string to double 224 atoi()—Converts a text string to integer 225 atol()—Converts a text string to long integer 226 bsearch()—Searches a sorted array 227 calloc()—Allocates and zeroes memory 229 ceil()—Computes the smallest integer greater than or equal to x 230 cfgetispeed()—Reads terminal input baud rate 231 cfgetospeed()—Reads terminal output baud rate 232 cfsetispeed()—Sets terminal input baud rate 233 cfsetospeed()—Sets terminal output baud rate 234 chdir()—Changes the current working directory 235 chmod()—Changes file mode 236 chown()—Changes the owner and/or group of a file 238 clearerr()—Clears end—of-file and error indicators for a stream 240 clock( )—Determines processor time used 241 close()—Closes a file 242 closedir()—Ends directory read operation 243 cos()—Computes the cosine function 244 cosh()—Computes the hyperbolic cosine function 245 creat()—Creates a new file or rewrites an existing one 246 ctermid()—Generates terminal pathname 247 ctime()—Formats a calendar time 248 cuserid()—Gets user name 249 difftime()—Computes the difference between two times 250 div()—Computes the quotient and remainder of an integer division 251 dup()—Duplicates an open file descriptor 252 dup2()——Duplicates an open file descriptor 253 execl()—Executes a file 254 execle()—Executes a file 256 execlp()—Executes a file 258 execv()—Executes a file 260 execve()—Executes a file 262 execvp()—Executes a file 264 exit()—Causes normal program termination 266 _exit()—Terminates a process 267 exp()—Computes the exponential function 268 fabs()—Computes the absolute-value function 269 fclose()—Closes an open stream 270 fcntl()—Manipulates an open file descriptor 271 fdopen()—Opens a stream on a file descriptor 274 feoff()—Tests the end-of-file indicator for a stream 275 ferror()—Tests the error indicator for a stream 276 fflush()—Updates stream 277 fgetc()—Reads a character from a stream 278 fgetpos()—Gets the current file position 279 fgets( )—Reads n characters from a stream 280 fileno()—Maps a stream pointer to a file descriptor 281 floor( )—Computes the largest integer not greater than x 282 fmod()—Computes the remainder of x/y 283 fopen()—Opens a stream 284 fork()—Creates a process 285 fpathconf()—Gets configuration variable for an open file 287 fprintf( )—Writes formatted text to a stream 289 fputc( )—Writes a character to a stream 293 fputs()—Writes a string to a stream 294 fread()—Reads an array from a stream 295 free()—Deallocates dynamic memory 296 freopen()—Closes and then opens a stream 297 frexp()—Breaks a floating-point number into a fraction and integer 298 fscanf( )—Reads formatted input from a stream 299 fseek()—Sets file position 302 fsetpos()—Sets the file position for a stream 303 fstat()—Gets file status 304 ftell()—Gets the position indicator for a stream 305 fwrite()—Writes an array to a stream 306 getc()—Reads a character from a stream 307 getchar()—Reads a character from standard input 308 getcwd()—Gets current working directory 309 getegid()—Gets effective group ID 310 getenv()—Gets the environment variable 311 geteuid()—Gets effective user ID 313 getgid()—Gets real group ID 314 getgrgid()—Reads groups database based on group ID 315 getgrnam)—Reads group database based on group name 316 getgroups()—Gets supplementary group IDs 317 getlogin()—Gets user name 319 getpgrp()—Gets process group ID 320 getpid()—Gets process ID 321 getppid()—Gets parent process ID 322 getpwnam()—Reads user database based on user name 323 getpwuid()—Reads user database based on user ID 324 gets()—Reads a string from standard input 325 getuid()—Gets real user ID 326 gmtime()—Breaks down a timer value into a time structure in Coordinated Universal Time (UTC) isalnum()—Tests for alphabetic or numeric character 328 isalpha()—Tests for alphabetic character 329 isatty( )—Determines if a file descriptor is associated with a terminal 330 iscntrl()—Tests for control character 331 isdigit()—Tests for decimal-digit character 332 isgraph()—Tests for printing character 333 islower()—Tests for lowercase character 334 isprint()—Tests for printing character 335 ispunct()—Tests for punctuation 336 isspace()—Tests for white-space character 337 isupper()—Tests for uppercase alphabetic character 338 isxdigit()—Tests for hexadecimal-digit character 339 kill()—Sends a signal to a process 340 labs()—Computes the absolute value of a long integer 341 ldexp()—Multiplies a floating-point number by a power of 2 342 ldiv()—Computes the quotient and remainder of integer division 343 link()—Creates a link to a file 344 localeconv()—Gets rules to format numeric quantities for the current locale localtime()—Breaks down a timer value into a time structure in local time log()—Computes the natural log function 347 loglO()—Computes the base-ten logarithm function 348 longjmp()—Restores the calling environment 349 lseek()—Repositions read/write file offset 350 malloc()—Allocates dynamic memory 352 mblen()—Determines the number of bytes in a character 353 mbstowcs()—Converts a multibyte string to a wide-character string 354 mbtowc()—Converts a multibyte character to a wide character 355 memchr()—Scans memory for a byte 356 memcmp()—Compares two memory objects 357 memcpy()—Copies non-overlapping memory objects 358 memmove()—Copies (possibly overlapping) memory objects 359 memset( )—Fills memory with a constant byte 360 mkdir()—Makes a directory 361 mkfifo()—Makes a FIFO special file 362

Intel0011 2014-07-06

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引用 4 楼 xhu_eternalcc 的回复:

[quote=引用 2 楼 Intel0011 的回复:] 查posix库信息

能详细点吗？[/quote] 《POSIX Programmer's Guide》这本书中Library Functions一章中有列举

下巴 2014-07-05

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man 2是c语言函数库 man 3是系统调用

Enockipp 2014-07-05

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引用 2 楼 Intel0011 的回复:

查posix库信息

能详细点吗？

Enockipp 2014-07-05

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引用 1 楼 taodm 的回复:

当然是都用C标准库的，posix的能不用就不用啊

嗯，但是有时得用非标准库的东西，比如isatty，那么怎么判断是posix呢？

Intel0011 2014-07-05

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查posix库信息

taodm 2014-07-05

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当然是都用C标准库的，posix的能不用就不用啊

怎样判断一个c函数是posix的？

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