explain man page

libexplain — Explain errno values returned by libc functions

Synopsis

cc ... -lexplain;

#include <libexplain/libexplain.h>

Description

The libexplain library exists to give explanations of error reported by system calls.  The error message returned by strerror(3) tend to be quite cryptic.  By providing a specific error report for each system call, a more detailed error message is possible, usually identifying and describing the specific cause from amongst the numerous meanings each errno value maps to.

Race Condition

The explanation of the cause of an error is dependent on the environment of the error to remain unchanged, so that when libexplain gets around to looking for the cause, the cause is still there.  On a running system, and particularly a multi‐user system, this is not always possible.

If an incorrect explanation is provided, it is possible that the cause is no longer present.

Compiling

Assuming the library header files has been installed into /usr/include, and the library files have been installed into /usr/lib, compiling against libexplain requires no special -I options.

When linking your pograms, add -lexplain to the list of libraries at the end of your link line.

cc ... -lexplain

When you configure your package with GNU Autoconf, you need the large file support macro

AC_SYS_LARGEFILE

If you aren't using GNU Autoconf, you will have to work out the needed large file support requirements yourdelf.

There is a pkg‐config(1) package for you to use, too:

CFLAGS="$CFLAGS `pkg-config libexplain --cflags`" LIBS="$LIBS `pkg-config libexplain --libs`"

This can make figuring out the command line requirements much easier.

Environment Variable

The EXPLAIN_OPTIONS environment variable may be used to control some of the content in the messages. Options are separated by comma (“,”) characters.

There are three ways to set an option:

1.

The form “name=value” may be used explicitly. The values “true” and “false” are used for boolean options.

2.

An option name alone is interpreted to mean “name=true”.

3.

The form “no‐name” is interpreted to mean “name=false”.

The following options are available:

debug

Additional debugging messages for libexplain developers. Not generally useful to clients of the library.
Default: false.

extra‐device‐info

Additional information for block and character special devices is printed when naming a file and its type.
Default: true

numeric‐errno

This option includes the numeric errno value in the message, e.g. “(2, ENOENT)” rather than “(ENOENT)”. Disabling this option is generally of use in automated testing, to prevent UNIX dialect differences from producing false negatives.
Default: true

dialect‐specific

This controls the presence of explanatory text specific to a particular UNIX dialect. It also suppresses printing system specific maximums. Disabling this option is generally of use in automated testing, to prevent UNIX dialect differences from producing false negatives.
Default: true.

hanging‐indent

This controls the hanging indent depth used for error message wrapping. By default no hanging indent is used, but this can sometimes obfuscate the end of one error message and the beginning of another.  A hanging indent results in continuation lines starting with white spoace, similar to RFC822 headers.  A value of 0 means no hanging indent (all lines flush with left margin).  A common value to use is 4: it doesn't consume to much of each line, and it is a clear indent. The program may choose to override the environment variable using the explain_option_hanging_indent_set(3) function. The hanging indent is limited to 10% of the terminal width.
Default: 0

internal‐strerror

This option controls the source of system eror message texts. If false, it uses strerorP(3) for the text. If true, it uses internal string for the text. This is mostly of use for automated testing, to avoid false negatives induced by inconsistencies across Unix implementations.
Default: false.

program‐name

This option controls the inclusion of the program name at the start of error messages, by the explain_*_or_die and explain_*_on_error functions. This helps users understand which command is throwing the error. Disabling this option may be of some interest to script writers. Program developers can use the explain_program_name_set(3) function to set the name of the command, if they wish to override the name that libexplain would otherwise obtain from the operating system. Program developers can use the explain_program_name_assemble(3) function to trump this option.
Default: true.

symbolic‐mode‐bits

This option controls how permission mode bits are represented in error messages. Setting this option to true will cause symbolic names to be printed (e.g. S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH). Setting this option to false will cause octal values to be printed (e.g. 0644).
Default: false.

Supported System Calls

Each supported system call has its own man page.

explain_accept(3)

Explain accept(2) errors

explain_accept_or_die(3)

accept a connection on a socket and report errors

explain_accept4(3)

Explain accept4(2) errors

explain_accept4_or_die(3)

accept a connection on a socket and report errors

explain_access(3)

Explain access(2) errors

explain_access_or_die(3)

check permissions for a file and report errors

explain_acct(3)

Explain acct(2) errors

explain_acct_or_die(3)

process accounting control and report errors

explain_acl_from_text(3)

Explain acl_from_text(3) errors

explain_acl_from_text_or_die(3)

create an ACL from text and report errors

explain_acl_get_fd(3)

Explain acl_get_fd(3) errors

explain_acl_get_fd_or_die(3)

Execute acl_get_fd(3) and report errors

explain_acl_get_file(3)

Explain acl_get_file(3) errors

explain_acl_get_file_or_die(3)

Execute acl_get_file(3) and report errors

explain_acl_set_fd(3)

Explain acl_set_fd(3) errors

explain_acl_set_fd_or_die(3)

set an ACL by file descriptor and report errors

explain_acl_set_file(3)

Explain acl_set_file(3) errors

explain_acl_set_file_or_die(3)

set an ACL by filename and report errors

explain_acl_to_text(3)

Explain acl_to_text(3) errors

explain_acl_to_text_or_die(3)

convert an ACL to text and report errors

explain_adjtime(3)

Explain adjtime(2) errors

explain_adjtime_or_die(3)

smoothly tune kernel clock and report errors

explain_adjtimex(3)

Explain adjtimex(2) errors

explain_adjtimex_or_die(3)

tune kernel clock and report errors

explain_asprintf(3)

Explain asprintf(3) errors

explain_asprintf_or_die(3)

print to allocated string and report errors

explain_bind(3)

Explain bind(2) errors

explain_bind_or_die(3)

bind a name to a socket and report errors

explain_calloc(3)

Explain calloc(3) errors

explain_calloc_or_die(3)

Allocate and clear memory and report errors

explain_chdir(3)

Explain chdir(2) errors

explain_chdir_or_die(3)

change working directory and report errors

explain_chmod(3)

Explain chmod(2) errors

explain_chmod_or_die(3)

change permissions of a file and report errors

explain_chown(3)

Explain chown errors

explain_chown_or_die(3)

change ownership of a file and report errors

explain_chroot(3)

Explain chroot(2) errors

explain_chroot_or_die(3)

change root directory and report errors

explain_close(3)

Explain close(2) errors

explain_close_or_die(3)

close a file descriptor and report errors

explain_closedir(3)

Explain closedir(3) errors

explain_closedir_or_die(3)

close a directory and report errors

explain_connect(3)

Explain connect(2) errors

explain_connect_or_die(3)

initiate a connection on a socket and report errors

explain_creat(3)

Explain creat(2) errors

explain_creat_or_die(3)

create and open a file and report errors

explain_dirfd(3)

Explain dirfd(3) errors

explain_dirfd_or_die(3)

get directory stream file descriptor and report errors

explain_dup(3)

Explain dup(2) errors

explain_dup_or_die(3)

duplicate a file descriptor and report errors

explain_dup2(3)

Explain dup2(2) errors

explain_dup2_or_die(3)

duplicate a file descriptor and report errors

explain_endgrent(3)

Explain endgrent(3) errors

explain_endgrent_or_die(3)

finish group file accesses and report errors

explain_eventfd(3)

Explain eventfd(2) errors

explain_eventfd_or_die(3)

create a file descriptor for event notification and report errors

explain_execlp(3)

Explain execlp(3) errors

explain_execlp_or_die(3)

execute a file and report errors

explain_execv(3)

Explain execv(3) errors

explain_execv_or_die(3)

execute a file and report errors

explain_execve(3)

Explain execve(2) errors

explain_execve_or_die(3)

execute program and report errors

explain_execvp(3)

Explain execvp(3) errors

explain_execvp_or_die(3)

execute program and report errors

explain_exit(3)

print an explanation of exit status before exiting

explain_fchdir(3)

Explain fchdir(2) errors

explain_fchmod(3)

Explain fchmod(2) errors

explain_fchmod_or_die(3)

change permissions of an open file and report errors

explain_fchown(3)

Explain fchown(2) errors

explain_fchown_or_die(3)

change ownership of a file and report errors

explain_fchownat(3)

Explain fchownat(2) errors

explain_fchownat_or_die(3)

change ownership of a file relative to a directory and report errors

explain_fclose(3)

Explain fclose(2) errors

explain_fclose_or_die(3)

close a stream and report errors

explain_fcntl(3)

Explain fcntl(2) errors

explain_fcntl_or_die(3)

Manipulate a file descriptor and report errors

explain_fdopen(3)

Explain fdopen(3) errors

explain_fdopen_or_die(3)

stream open function and report errors

explain_fdopendir(3)

Explain fdopendir(3) errors

explain_fdopendir_or_die(3)

open a directory and report errors

explain_feof(3)

Explain feof(3) errors

explain_feof_or_die(3)

check and reset stream status and report errors

explain_ferror(3)

Explain ferror(3) errors

explain_ferror_or_die(3)

check stream status and report errors

explain_fflush(3)

Explain fflush(3) errors

explain_fflush_or_die(3)

flush a stream and report errors

explain_fgetc(3)

Explain fgetc(3) errors

explain_fgetc_or_die(3)

input of characters and report errors

explain_fgetpos(3)

Explain fgetpos(3) errors

explain_fgetpos_or_die(3)

reposition a stream and report errors

explain_fgets(3)

Explain fgets(3) errors

explain_fgets_or_die(3)

input of strings and report errors

explain_fileno(3)

Explain fileno(3) errors

explain_fileno_or_die(3)

check and reset stream status and report errors

explain_flock(3)

Explain flock(2) errors

explain_flock_or_die(3)

apply or remove an advisory lock on an open file and report errors

explain_fopen(3)

Explain fopen(3) errors

explain_fopen_or_die(2)

open files and report errors

explain_fork(3)

Explain fork(2) errors

explain_fork_or_die(3)

create a child process and report errors

explain_fpathconf(3)

Explain fpathconf(3) errors

explain_fpathconf_or_die(3)

get configuration values for files and report errors

explain_fprintf(3)

Explain fprintf(3) errors

explain_fprintf_or_die(3)

formatted output conversion and report errors

explain_fpurge(3)

Explain fpurge(3) errors

explain_fpurge_or_die(3)

purge a stream and report errors

explain_fputc(3)

Explain fputc(3) errors

explain_fputc_or_die(3)

output of characters and report errors

explain_fputs(3)

Explain fputs(3) errors

explain_fputs_or_die(3)

write a string to a stream and report errors

explain_fread(3)

Explain fread(3) errors

explain_fread_or_die(3)

binary stream input and report errors

explain_freopen(3)

Explain freopen(3) errors

explain_freopen_or_die(3)

open files and report errors

explain_fseek(3)

Explain fseek(3) errors

explain_fseek_or_die(3)

reposition a stream and report errors

explain_fseeko(3)

Explain fseeko(3) errors

explain_fseeko_or_die(3)

seek to or report file position and report errors

explain_fsetpos(3)

Explain fsetpos(3) errors

explain_fsetpos_or_die(3)

reposition a stream and report errors

explain_fstat(3)

Explain fstat(3) errors

explain_fstat_or_die(3)

get file status and report errors

explain_fstatat(3)

Explain fstatat(2) errors

explain_fstatat_or_die(3)

get file status relative to a directory file descriptor and report errors

explain_fstatfs(3)

Explain fstatfs(2) errors

explain_fstatfs_or_die(3)

get file system statistics and report errors

explain_fstatvfs(3)

Explain fstatvfs(2) errors

explain_fstatvfs_or_die(3)

get file system statistics and report errors

explain_fsync(3)

Explain fsync(2) errors

explain_fsync_or_die(3)

synchronize a file's in‐core state with storage device and report errors

explain_ftell(3)

Explain ftell(3) errors

explain_ftell_or_die(3)

get stream position and report errors

explain_ftello(3)

Explain ftello(3) errors

explain_ftello_or_die(3)

get stream position and report errors

explain_ftime(3)

Explain ftime(3) errors

explain_ftime_or_die(3)

return date and time and report errors

explain_ftruncate(3)

Explain ftruncate(2) errors

explain_ftruncate_or_die(3)

truncate a file to a specified length and report errors

explain_futimens(3)

Explain futimens(3) errors

explain_futimens_or_die(3)

change file timestamps with nanosecond precision and report errors

explain_futimes(3)

Explain futimes(3) errors

explain_futimes_or_die(3)

Execute futimes(3) and report errors

explain_futimesat(3)

Explain futimesat(2) errors

explain_futimesat_or_die(3)

change timestamps of a file relative to a directory  and report errors

explain_fwrite(3)

Explain fwrite(3) errors

explain_fwrite_or_die(3)

binary stream output and report errors

explain_futimesat(3)

Explain futimesat(2) errors

explain_futimesat_or_die(3)

change timestamps of a file relative to a directory  and report errors

explain_getaddrinfo(3)

Explain getaddrinfo(3) errors

explain_getaddrinfo_or_die(3)

network address and and report errors

explain_getc(3)

Explain getc(3) errors

explain_getc_or_die(3)

input of characters and report errors

explain_getchar(3)

Explain getchar(3) errors

explain_getchar_or_die(3)

input of characters and report errors

explain_getcwd(3)

Explain getcwd(2) errors

explain_getdomainname(3)

Explain getdomainname(2) errors

explain_getdomainname_or_die(3)

get domain name and report errors

explain_getgrent(3)

Explain getgrent(3) errors

explain_getgrent_or_die(3)

get group file entry and report errors

explain_getgrouplist(3)

Explain getgrouplist(3) errors

explain_getgrouplist_or_die(3)

get list of groups to which a user belongs and report errors

explain_getgroups(3)

Explain getgroups(2) errors

explain_getgroups_or_die(3)

get list of supplementary group IDs and report errors

explain_getcwd_or_die(3)

Get current working directory and report errors

explain_gethostbyname(3)

Explain gethostbyname(3) errors

explain_gethostbyname_or_die(3)

get host address given host name and report errors

explain_gethostid(3)

Explain gethostid(3) errors

explain_gethostid_or_die(3)

get the unique identifier of the current host and report errors

explain_gethostname(3)

Explain gethostname(2) errors

explain_gethostname_or_die(3)

get hostname and report errors

explain_getpeername(3)

Explain getpeername(2) errors

explain_getpeername_or_die(3)

Executegetpeername(2) and report errors

explain_getpgid(3)

Explain getpgid(2) errors

explain_getpgid_or_die(3)

get process group and report errors

explain_getpgrp(3)

Explain getpgrp(2) errors

explain_getpgrp_or_die(3)

get process group and report errors

explain_getpriority(3)

Explain getpriority(2) errors

explain_getpriority_or_die(3)

get program scheduling priority and report errors

explain_getresgid(3)

Explain getresgid(2) errors

explain_getresgid_or_die(3)

get real, effective and saved group IDs and report errors

explain_getresuid(3)

Explain getresuid(2) errors

explain_getresuid_or_die(3)

get real, effective and saved user IDs and report errors

explain_getrlimit(3)

Explain getrlimit(2) errors

explain_getrlimit_or_die(3)

get resource limits and report errors

explain_getrusage(3)

Explain getrusage(2) errors

explain_getrusage_or_die(3)

get resource usage and report errors

explain_getsockname(3)

Explain getsockname(2) errors

explain_getsockname_or_die(3)

Execute getsockname(2) and report errors

explain_getsockopt(3)

Explain getsockopt(2) errors

explain_getsockopt_or_die(3)

Execute getsockopt(2) and report errors

explain_gettimeofday(3)

Explain gettimeofday(2) errors

explain_gettimeofday_or_die(3)

get time and report errors

explain_getw(3)

Explain getw(3) errors

explain_getw_or_die(3)

input a word (int) and report errors

explain_iconv(3)

Explain iconv(3) errors

explain_iconv_or_die(3)

perform character set conversion and report errors

explain_iconv_close(3)

Explain iconv_close(3) errors

explain_iconv_close_or_die(3)

deallocate descriptor for character set conversion and report errors

explain_iconv_open(3)

Explain iconv_open(3) errors

explain_iconv_open_or_die(3)

allocate descriptor for character set conversion and report errors

explain_ioctl(3)

Explain ioctl(2) errors

explain_ioctl_or_die(3)

Execute ioctl(2) and report errors

explain_kill(3)

Explain kill(2) errors

explain_kill_or_die(3)

send signal to a process and report errors

explain_lchmod(3)

Explain lchmod(2) errors

explain_lchmod_or_die(3)

change permissions of a file and report errors

explain_lchown(3)

Explain lchown(2) errors

explain_lchown_or_die(3)

change ownership of a file and report errors

explain_lchownat(3)

Explain lchownat(2) errors

explain_lchownat_or_die(3)

Execute lchownat(2) and report errors

explain_link(3)

Explain link(2) errors

explain_link_or_die(3)

make a new name for a file and report errors

explain_linkat(3)

Explain linkat(2) errors

explain_linkat_or_die(3)

create a file link relative to directory file descriptors and report errors

explain_listen(3)

Explain listen(2) errors

explain_listen_or_die(3)

listen for connections on a socket and report errors

explain_lseek(3)

Explain lseek(2) errors

explain_lseek_or_die(3)

reposition file offset and report errors

explain_lstat(3)

Explain lstat(2) errors

explain_lstat_or_die(3)

get file status and report errors

explain_lutimes(3)

Explain lutimes(3) errors

explain_lutimes_or_die(3)

modify file timestamps and report errors

explain_malloc(3)

Explain malloc(3) errors

explain_malloc_or_die(3)

Execute malloc(3) and report errors

explain_mkdir(3)

Explain mkdir(2) errors

explain_mkdir_or_die(3)

create directory and report errors

explain_mkdtemp(3)

Explain mkdtemp(3) errors

explain_mkdtemp_or_die(3)

create a unique temporary directory and report errors

explain_mknod(3)

Explain mknod(2) errors

explain_mknod_or_die(3)

create a special or ordinary file and report errors

explain_mkostemp(3)

Explain mkostemp(3) errors

explain_mkostemp_or_die(3)

create a unique temporary file and report errors

explain_mkstemp(3)

Explain mkstemp(3) errors

explain_mkstemp_or_die(3)

create a unique temporary file and report errors

explain_mktemp(3)

Explain mktemp(3) errors

explain_mktemp_or_die(3)

make a unique temporary filename and report errors

explain_mmap(3)

Explain mmap(2) errors

explain_mmap_or_die(3)

map file or device into memory and report errors

explain_mount(3)

Explain mount(2) errors

explain_mount_or_die(3)

mount file system and report errors

explain_munmap(3)

Explain munmap(2) errors

explain_munmap_or_die(3)

unmap a file or device from memory and report errors

explain_nanosleep(3)

Explain nanosleep(2) errors

explain_nanosleep_or_die(3)

   high‐resolution sleep and report errors

explain_nice(3)

Explain nice(2) errors

explain_nice_or_die(3)

change process priority and report errors

explain_open(3)

Explain open(2) errors

explain_open_or_die(3)

open files and report errors

explain_openat(3)

Explain openat(2) errors

explain_openat_or_die(3)

open a file relative to a directory file descriptor and report errors

explain_opendir(3)

Explain opendir(3) errors

explain_opendir_or_die(3)

open a directory and report errors

explain_pathconf(3)

Explain pathconf(3) errors

explain_pathconf_or_die(3)

get configuration values for files and report errors

explain_pclose(3)

Explain pclose(3) errors

explain_pclose_or_die(3)

Execute pclose(3) and report errors

explain_pipe(3)

Explain pipe(2) errors

explain_pipe_or_die(3)

Execute pipe(2) and report errors

explain_pipe2(3)

Explain pipe2(2) errors

explain_pipe2_or_die(3)

create pipe and report errors

explain_poll(3)

Explain poll(2) errors

explain_poll_or_die(3)

wait for some event on a file descriptor and report errors

explain_popen(3)

Explain popen(3) errors

explain_popen_or_die(3)

Execute popen(3) and report errors

explain_pread(3)

Explain pread(2) errors

explain_pread_or_die(3)

read from a file descriptor at a given offset and report errors

explain_printf(3)

Explain printf(3) errors

explain_printf_or_die(3)

formatted output conversion and report errors

explain_ptrace(3)

Explain ptrace(2) errors

explain_ptrace_or_die(3)

process trace and report errors

explain_putc(3)

Explain putc(3) errors

explain_putc_or_die(3)

output of characters and report errors

explain_putchar(3)

Explain putchar(3) errors

explain_putchar_or_die(3)

output of characters and report errors

explain_putenv(3)

Explain putenv(3) errors

explain_putenv_or_die(3)

change or add an environment variable and report errors

explain_puts(3)

Explain puts(3) errors

explain_puts_or_die(3)

write a string and a trailing newline to stdout and report errors

explain_putw(3)

Explain putw(3) errors

explain_putw_or_die(3)

output a word (int) and report errors

explain_pwrite(3)

Explain pwrite(2) errors

explain_pwrite_or_die(3)

write to a file descriptor at a given offset and report errors

explain_raise(3)

Explain raise(3) errors

explain_raise_or_die(3)

send a signal to the caller and report errors

explain_read(3)

Explain read(2) errors

explain_read_or_die(3)

read from a file descriptor and report errors

explain_readdir(3)

Explain readdir(3) errors

explain_readdir_or_die(3)

read a directory and report errors

explain_readlink(3)

Explain readlink(2) errors

explain_readlink_or_die(3)

read value of a symbolic link and report errors

explain_readv(3)

Explain readv(2) errors

explain_readv_or_die(3)

read data into multiple buffers and report errors

explain_realloc(3)

Explain realloc(3) errors

explain_realloc_or_die(3)

Execute realloc(3) and report errors

explain_realpath(3)

Explain realpath(3) errors

explain_realpath_or_die(3)

return the canonicalized absolute pathname and report errors

explain_rename(3)

Explain rename(2) errors

explain_rename_or_die(3)

change the name or location of a file and report errors

explain_rmdir(3)

Explain rmdir(2) errors

explain_rmdir_or_die(3)

delete a directory and report errors

explain_select(3)

Explain select(2) errors

explain_select_or_die(3)

execute select(2) and report errors

explain_setbuf(3)

Explain setbuf(3) errors

explain_setbuffer(3)

Explain setbuffer(3) errors

explain_setbuffer_or_die(3)

stream buffering operations and report errors

explain_setbuf_or_die(3)

set stream buffer and report errors

explain_setdomainname(3)

Explain setdomainname(2) errors

explain_setdomainname_or_die(3)

set domain name and report errors

explain_setenv(3)

Explain setenv(3) errors

explain_setenv_or_die(3)

change or add an environment variable and report errors

explain_setgid(3)

Explain setgid(2) errors

explain_setgid_or_die(3)

set group identity and report errors

explain_setgrent(3)

Explain setgrent(3) errors

explain_setgrent_or_die(3)

rewind to the start of the group database and report errors

explain_setgroups(3)

Explain setgroups(2) errors

explain_setgroups_or_die(3)

get list of supplementary group IDs and report errors

explain_sethostname(3)

Explain sethostname(2) errors

explain_sethostname_or_die(3)

set hostname and report errors

explain_setlinebuf(3)

Explain setlinebuf(3) errors

explain_setlinebuf_or_die(3)

stream buffering operations and report errors

explain_setpgid(3)

Explain setpgid(2) errors

explain_setpgid_or_die(3)

set process group and report errors

explain_setpgrp(3)

Explain setpgrp(2) errors

explain_setpgrp_or_die(3)

set process group and report errors

explain_setpriority(3)

Explain setpriority(2) errors

explain_setpriority_or_die(3)

set program scheduling priority and report errors

explain_setregid(3)

Explain setregid(2) errors

explain_setregid_or_die(3)

set real and/or effective group ID and report errors

explain_setreuid(3)

Explain setreuid(2) errors

explain_setreuid_or_die(3)

set the real and effective user ID and report errors

explain_setresgid(3)

Explain setresgid(2) errors

explain_setresgid_or_die(3)

set real, effective and saved group ID and report errors

explain_setresuid(3)

Explain setresuid(2) errors

explain_setresuid_or_die(3)

set real, effective and saved user ID and report errors

explain_setreuid(3)

Explain setreuid(2) errors

explain_setreuid_or_die(3)

set real and/or effective user ID and report errors

explain_setsid(3)

Explain setsid(2) errors

explain_setsid_or_die(3)

creates a session and sets the process group ID and report errors

explain_setsockopt(3)

Explain setsockopt(2) errors

explain_setsockopt_or_die(3)

execute setsockopt(2) and report errors

explain_settimeofday(3)

Explain settimeofday(2) errors

explain_settimeofday_or_die(3)

sets system time and report errors

explain_setuid(3)

Explain setuid(2) errors

explain_setuid_or_die(3)

set user identity and report errors

explain_setvbuf(3)

Explain setvbuf(3) errors

explain_setvbuf_or_die(3)

stream buffering operations and report errors

explain_shmat(3)

Explain shmat(2) errors

explain_shmat_or_die(3)

shared memory attach and report errors

explain_shmctl(3)

Explain shmctl(2) errors

explain_shmctl_or_die(3)

shared memory control and report errors

explain_signalfd(3)

Explain signalfd(2) errors

explain_signalfd_or_die(3)

create a file descriptor for accepting signals and report errors

explain_sleep(3)

Explain sleep(3) errors

explain_sleep_or_die(3)

Sleep for the specified number of seconds and report errors

explain_socket(3)

Explain socket(2) errors

explain_socket_or_die(3)

create an endpoint for communication and report errors

explain_socketpair(3)

Explain socketpair(2) errors

explain_socketpair_or_die(3)

create a pair of connected sockets and report errors

explain_sprintf(3)

Explain sprintf(3) errors

explain_sprintf_or_die(3)

formatted output conversion and report errors

explain_stat(3)

Explain stat(2) errors

explain_statfs(3)

Explain statfs(2) errors

explain_statfs_or_die(3)

get file system statistics and report errors

explain_statvfs(3)

Explain statvfs(2) errors

explain_statvfs_or_die(3)

get file system statistics and report errors

explain_stime(3)

Explain stime(2) errors

explain_stime_or_die(3)

set system time and report errors

explain_strcoll(3)

Explain strcoll(3) errors

explain_strcoll_or_die(3)

compare two strings using the current locale and report errors

explain_strdup(3)

Explain strdup(3) errors

explain_strdup_or_die(3)

duplicate a string and report errors

explain_strndup(3)

Explain strndup(3) errors

explain_strndup_or_die(3)

duplicate a string and report errors

explain_strtod(3)

Explain strtod(3) errors

explain_strtod_or_die(3)

convert string to floating‐point number and report errors

explain_strtof(3)

Explain strtof(3) errors

explain_strtof_or_die(3)

convert string to floating‐point number and report errors

explain_strtol(3)

Explain strtol(3) errors

explain_strtol_or_die(3)

convert a string to a long integer and report errors

explain_strtold(3)

Explain strtold(3) errors

explain_strtold_or_die(3)

convert string to floating‐point number and report errors

explain_strtoll(3)

Explain strtoll(3) errors

explain_strtoll_or_die(3)

convert a string to a long long integer and report errors

explain_strtoul(3)

Explain strtoul(3) errors

explain_strtoul_or_die(3)

convert a string to a long long integer and report errors

explain_strtoull(3)

Explain strtoull(3) errors

explain_strtoull_or_die(3)

convert a string to an unsigned long long integer and report errors

explain_symlink(3)

Explain symlink(2) errors

explain_symlink_or_die(3)

make a new name for a file and report errors

explain_system(3)

Explain system(3) errors

explain_system_or_die(3)

execute a shell command and report errors

explain_tcdrain(3)

Explain tcdrain(3) errors

explain_tcdrain_or_die(3)

Execute tcdrain(3) and report errors

explain_tcflow(3)

Explain tcflow(3) errors

explain_tcflow_or_die(3)

Execute tcflow(3) and report errors

explain_tcflush(3)

Explain tcflush(3) errors

explain_tcflush_or_die(3)

discard terminal data and report errors

explain_tcgetattr(3)

Explain tcgetattr(3) errors

explain_tcgetattr_or_die(3)

get terminal parameters and report errors

explain_tcsendbreak(3)

Explain tcsendbreak(3) errors

explain_tcsendbreak_or_die(3)

send terminal line break and report errors

explain_tcsetattr(3)

Explain tcsetattr(3) errors

explain_tcsetattr_or_die(3)

set terminal attributes and report errors

explain_telldir(3)

Explain telldir(3) errors

explain_telldir_or_die(3)

return current location in directory stream and report errors

explain_tempnam(3)

Explain tempnam(3) errors

explain_tempnam_or_die(3)

create a name for a temporary file and report errors

explain_time(3)

Explain time(2) errors

explain_time_or_die(3)

get time in seconds and report errors

explain_timerfd_create(3)

Explain timerfd_create(2) errors

explain_timerfd_create_or_die(3)

timers that notify via file descriptors and report errors

explain_tmpfile(3)

Explain tmpfile(3) errors

explain_tmpfile_or_die(3)

create a temporary file and report errors

explain_tmpnam(3)

Explain tmpnam(3) errors

explain_tmpnam_or_die(3)

create a name for a temporary file and report errors

explain_truncate(3)

Explain truncate(2) errors

explain_truncate_or_die(3)

truncate a file to a specified length and report errors

explain_usleep(3)

Explain usleep(3) errors

explain_usleep_or_die(3)

suspend execution for microsecond intervals and report errors

explain_uname(3)

Explain uname(2) errors

explain_uname_or_die(3)

get name and information about current kernel and report errors

explain_ungetc(3)

Explain ungetc(3) errors

explain_ungetc_or_die(3)

push a character back to a stream and report errors

explain_unlink(3)

Explain unlink(2) errors

explain_unlink_or_die(3)

delete a file and report errors

explain_unsetenv(3)

Explain unsetenv(3) errors

explain_unsetenv_or_die(3)

remove an environment variable and report errors

explain_ustat(3)

Explain ustat(2) errors

explain_ustat_or_die(3)

get file system statistics and report errors

explain_utime(3)

Explain utime(2) errors

explain_utime_or_die(3)

change file last access and modification times and report errors

explain_utimens(3)

Explain utimens(2) errors

explain_utimens_or_die(3)

change file last access and modification times and report errors

explain_utimensat(3)

Explain utimensat(2) errors

explain_utimensat_or_die(3)

change file timestamps with nanosecond precision and report errors

explain_utimes(3)

Explain utimes(2) errors

explain_utimes_or_die(3)

change file last access and modification times and report errors

explain_vasprintf(3)

Explain vasprintf(3) errors

explain_vasprintf_or_die(3)

print to allocated string and report errors

explain_vfork(3)

Explain vfork(2) errors

explain_vfork_or_die(3)

create a child process and block parent and report errors

explain_vfprintf(3)

Explain vfprintf(3) errors

explain_vfprintf_or_die(3)

formatted output conversion and report errors

explain_vprintf(3)

Explain vprintf(3) errors

explain_vprintf_or_die(3)

formatted output conversion and report errors

explain_vsnprintf(3)

Explain vsnprintf(3) errors

explain_vsnprintf_or_die(3)

formatted output conversion and report errors

explain_snprintf(3)

Explain snprintf(3) errors

explain_snprintf_or_die(3)

formatted output conversion and report errors

explain_vsprintf(3)

Explain vsprintf(3) errors

explain_vsprintf_or_die(3)

formatted output conversion and report errors

explain_wait(3)

Explain wait(2) errors

explain_wait_or_die(3)

wait for process to change state and report errors

explain_wait3(3)

Explain wait3(2) errors

explain_wait3_or_die(3)

wait for process to change state and report errors

explain_wait4(3)

Explain wait4(2) errors

explain_wait4_or_die(3)

wait for process to change state and report errors

explain_waitpid(3)

Explain waitpid(2) errors

explain_waitpid_or_die(3)

wait for process to change state and report errors

explain_write(3)

Explain write(2) errors

explain_write_or_die(3)

write to a file descriptor and report errors

explain_writev(3)

Explain writev(2) errors

explain_writev_or_die(3)

write data from multiple buffers and report errors

There are plans for additional coverage. This list is expected to expand in later releases of this library.

See Also

errno(3)

number of last error

perror(3)

print a system error message

strerror(3)

return string describing error number

Author

Written by Peter Miller <pmiller@opensource.org.au>

Referenced By

explain_output(3).