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字符测试篇
isalnum
isalpha
isascii
iscntrl
isdigit
isgraphis
islower
isprint
isspace
ispunct
isupper
isxdigit

字符串转换篇
atof
atoi
atol
gcvt
strtod
strtol
strtoul
toascii
tolower
toupper

内存控制篇
calloc
free
getpagesize
malloc
mmap
munmap

日期时间篇
asctime
ctime
gettimeofday
gmtime
localtime
mktime
settimeofday
time

内存及字符串操作篇
bcmp
bcopy
bzero
index
memccpy
memchr
memcmp
memcpy
memmove
memset
rindex
strcasecmp
strcat
strchr
strcmp
strcoll
strcpy
strcspn
strdup
strlen
strncasecmp
strncat
strncpy
strpbrk
strrchr
strspn
strstr
strtok

常用数学函数篇
abs
acos
asin
atan
atan2
ceil
cos
cosh
exp
frexp
ldexp
log
log10
pow
sin
sinh
sqrt
tan
tanh

用户组篇
endgrent
endpwent
endutent
fgetgrent
fgetpwent
getegid
geteuid
getgid
getgrent
getgrgid
getgrnam
getgroups
getpw
getpwent
getpwnam
getpwuid
getuid
getutent
getutid
getutline
initgroups
pututline
seteuid
setfsgid
setfsuid
setgid
setgrent
setgroups
setpwent
setregid
setreuid
setuid
setutent
utmpname

数据结构及算法篇
crypt
bsearch
lfind
lsearch
qsort
rand
srand

文件操作篇
close
creat
dup
dup2
fcntl
flock
fsync
lseek
mkstemp
open
read
sync
write

文件内容操作篇
clearerr
fclose
fdopen
feof
fflush
fgetc
fgets
fileno
fopen
fputc
fputs
fread
freopen
fseek
ftell
fwrite
getc
getchar
gets
mktemp
putc
putchar
rewind
setbuf
setbuffer
setlinebuf
setvbuf
ungetc

进程操作篇
atexit
execl
execlp
execv
execve
execvp
exit
_exit
vfork
getpgid
getpgrp
getpid
getppid
getpriority
nice
on_exit
setpgid
setpgrp
setpriority
system
wait
waitpid
fprintf
fscanf
printf
sacnf
sprintf
sscanf
vfprintf
vfscanf
vprintf
vscanf
vsprintf
vsscanf

文件权限控制篇
access
alphasort
chdir
chmod
chown
chroot
closedir
fchdir
fchmod
fchown
fstat
ftruncate
getcwd
link
lstat
opendir
readdir
readlink
remove
rename
rewinddir
seekdir
stat
symlink
telldir
truncate
umask
unlink
utime
utimes

信号处理篇
alarm
kill
pause
sigaction
sigaddset
sigdelset
sigemptyset
sigfillset
sigismember
signal
sigpending
sigprocmask
sleep
ferror
perror
strerror
mkfifo
pclose
pipe
popen

接口处理篇
accept
bind
connect
endprotoent
endservent
getsockopt
htonl
htons
inet_addr
inet_aton
inet_ntoa
listen
ntohl
ntohs
recv
recvfrom
recvmsg
send
sendmsg
sendto
setprotoent
setservent
setsockopt
shutdown
socket

环境变量篇
getenv
putenv
setenv

终端控制篇
getopt
isatty
select
ttyname