diff options
Diffstat (limited to '')
| -rw-r--r-- | man/libsimple_vmemalloc.3 | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/man/libsimple_vmemalloc.3 b/man/libsimple_vmemalloc.3 new file mode 100644 index 0000000..46c8f88 --- /dev/null +++ b/man/libsimple_vmemalloc.3 @@ -0,0 +1,300 @@ +.TH LIBSIMPLE_VMEMALLOC 3 2018-11-03 libsimple +.SH NAME +libsimple_vmemalloc \- allocate memory with custom alignment +.SH SYNOPSIS +.nf +#include <libsimple.h> + +enum libsimple_memalloc_option { + /* constants omitted, see \fBDESCRIPTION\fP */ +}; + +void *libsimple_vmemalloc(size_t \fIn\fP, va_list \fIap\fP); +void *libsimple_envmemalloc(int \fIstatus\fP, size_t \fIn\fP, va_list \fIap\fP); +static inline void *libsimple_evmemalloc(size_t \fIn\fP, va_list \fIap\fP); +static inline void *libsimple_memalloc(size_t \fIn\fP, ..., /* LIBSIMPLE_MEMALLOC_END */); +static inline void *libsimple_enmemalloc(int \fIstatus\fP, size_t \fIn\fP, ..., /* LIBSIMPLE_MEMALLOC_END */); +static inline void *libsimple_ememalloc(size_t \fIn\fP, ..., /* LIBSIMPLE_MEMALLOC_END */); +.fi +.PP +Link with +.IR \-lsimple . +.SH DESCRIPTION +The +.BR libsimple_vmemalloc () +function is a flexible alternative to standard allocation +functions. +.PP +.I va +is a list of options that specify the behaviour, its +end is marked by +.BR LIBSIMPLE_MEMALLOC_END , +the following options (which is the type +.BR "enum libsimple_memalloc_option" ) +are recognised: +.TP +.B LIBSIMPLE_MEMALLOC_ZERO_INIT +The allocated memory shall be initialisd with NUL bytes. +.TP +.B LIBSIMPLE_MEMALLOC_CONDITIONAL_ZERO_INIT +The allocated memory shall be initialisd with NUL bytes +with the argument, which should be of the type +.BR int , +is nonzero. +.TP +.B LIBSIMPLE_MEMALLOC_UNIQUE_IF_ZERO +If attempting to allocate 0 bytes, +rather than failing with +.I errno +set to +.BR EINVAL , +a unique pointer (that can be deallocated) +should be returned. +.TP +.B LIBSIMPLE_MEMALLOC_NULL_IF_ZERO +If attempting to allocate 0 bytes, +rather than failing with +.I errno +set to +.BR EINVAL , +a +.B NULL +should be returned. +.TP +.B LIBSIMPLE_MEMALLOC_ALIGNMENT +The value of the next argument, which should be of the type +.BR size_t , +should be used as the alignment of the returned pointer. +By default the alignment is +.IR "alignof(max_align_t)" . +.TP +.B LIBSIMPLE_MEMALLOC_PAGE_ALIGNMENT +The alignment of the returned pointer should be the page size. +By default the alignment is +.IR "alignof(max_align_t)" . +.TP +.B LIBSIMPLE_MEMALLOC_ROUND_UP_SIZE_TO_ALIGNMENT +The number of bytes to allocated should be rounded up to +the next multiple of the alignment, unless it already is +a multiple of the alignment. +.TP +.B LIBSIMPLE_MEMALLOC_ELEMENT_SIZE +The next argument, which should be of the type +.BR size_t , +shall act as a multiplier for the number of bytes to allocate +(default multiplier is 1), effectively, making the specified +allocation size specified in elements rather than in bytes. +.TP +.B LIBSIMPLE_MEMALLOC_PRODUCT_SIZE +If +.I n +is zero, the product of the following arguments, +which should be of the type +.BR size_t , +up to the first 0, shall be used as the allocation size. +If +.I n +is not zero, the product of the following +.I n +arguments, also of type +.BR size_t , +shall be used as the allocation size. +By default +.I n +bytes are allocated. +.TP +.B LIBSIMPLE_MEMALLOC_VA_PRODUCT_SIZE +Like +.BR LIBSIMPLE_MEMALLOC_PRODUCT_SIZE , +the arguments are read from the next argument, +which should be of the type +.BR va_list . +.TP +.B LIBSIMPLE_MEMALLOC_1_VA_PRODUCT_SIZE +Like +.BR LIBSIMPLE_MEMALLOC_PRODUCT_SIZE , +except two arguments read from +.IR ap : +a +.BR size_t , +which act as the first factor, and a +.B va_list +with the rest of the factors. +.TP +.B LIBSIMPLE_MEMALLOC_VA_LIST +Arguments from the next argument, which should be of the type +.B va_list +and should end with +.BR LIBSIMPLE_MEMALLOC_END , +shall be parsed as options for the memory allocation. +.PP +Each +.B enum libsimple_memalloc_option +constant have a self-referencing macros defined +which can be used to test which constants are defined. +.PP +The +.BR libsimple_envmemalloc () +and +.BR libsimple_evmemalloc () +functions are versions of the +.BR libsimple_vmemalloc () +that terminate the process by calling the +.BR libsimple_enprintf (3) +(with +.I status +as the exit value) and +.BR libsimple_eprintf (3) +functions, respectively. +.PP +The +.BR libsimple_memalloc (), +.BR libsimple_enmemalloc (), +and +.BR libsimple_ememalloc () +functions are versions of the +.BR libsimple_vmemalloc (), +.BR libsimple_envmemalloc (), +and +.BR libsimple_evmemalloc () +functions, respectively, that use variadic arguments +instead of +.BR va_list . +.SH RETURN VALUE +The +.BR libsimple_vmemalloc (), +.BR libsimple_envmemalloc (), +.BR libsimple_ememalloc (), +.BR libsimple_memalloc (), +.BR libsimple_enmemalloc (), +and +.BR libsimple_ememalloc () +functions return the a pointer to the allocated +memory upon successful completion; otherwise the +.BR libsimple_vmemalloc () +and +.BR libsimple_memalloc () +functions return +.B NULL +and set +.I errno +to indicate the error, whereas the +.BR libsimple_envmemalloc (), +.BR libsimple_ememalloc (), +.BR libsimple_enmemalloc (), +and +.BR libsimple_ememalloc () +functions terminate the process. +.SH ERRORS +The +.BR libsimple_vmemalloc () +and +.BR libsimple_memalloc () +functions will fail if +.TP +.B EINVAL +An invalid argument is specified. +.TP +.B EINVAL +An option is specified twice or in +conjunction with a mutually exclusive option. +.TP +.B ENOMEM +Enough memory could not be allocated. +.PP +The +.BR libsimple_envmemalloc (), +.BR libsimple_ememalloc (), +.BR libsimple_enmemalloc (), +and +.BR libsimple_ememalloc () +functions terminate the process on failure. +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lb lb lb +l l l. +Interface Attribute Value +T{ +.BR libsimple_vmemalloc (), +.br +.BR libsimple_envmemalloc (), +.br +.BR libsimple_ememalloc (), +.br +.BR libsimple_memalloc (), +.br +.BR libsimple_enmemalloc (), +.br +.BR libsimple_ememalloc () +T} Thread safety MT-Safe +T{ +.BR libsimple_vmemalloc (), +.br +.BR libsimple_envmemalloc (), +.br +.BR libsimple_ememalloc (), +.br +.BR libsimple_memalloc (), +.br +.BR libsimple_enmemalloc (), +.br +.BR libsimple_ememalloc () +T} Async-signal safety AS-Safe +T{ +.BR libsimple_vmemalloc (), +.br +.BR libsimple_envmemalloc (), +.br +.BR libsimple_ememalloc (), +.br +.BR libsimple_memalloc (), +.br +.BR libsimple_enmemalloc (), +.br +.BR libsimple_ememalloc () +T} Async-cancel safety AC-Safe +.TE +.SH EXAMPLES +None. +.SH APPLICATION USAGE +None. +.SH RATIONALE +None. +.SH FUTURE DIRECTIONS +None. +.SH NOTES +None. +.SH BUGS +None. +.SH SEE ALSO +.BR libsimple_enmalloc (3), +.BR libsimple_mallocz (3), +.BR libsimple_vmallocn (3), +.BR libsimple_vmalloczn (3), +.BR libsimple_encalloc (3), +.BR libsimple_vcallocn (3), +.BR libsimple_enrealloc (3), +.BR libsimple_vreallocn (3), +.BR libsimple_memalign (3), +.BR libsimple_memalignz (3), +.BR libsimple_vmemalignn (3), +.BR libsimple_vmemalignzn (3), +.BR libsimple_enposix_memalign (3), +.BR libsimple_posix_memalignz (3), +.BR libsimple_vposix_memalignn (3), +.BR libsimple_vposix_memalignzn (3), +.BR libsimple_enaligned_alloc (3), +.BR libsimple_aligned_allocz (3), +.BR libsimple_valigned_allocn (3), +.BR libsimple_valigned_alloczn (3), +.BR libsimple_pvalloc (3), +.BR libsimple_pvallocz (3), +.BR libsimple_vpvallocn (3), +.BR libsimple_vpvalloczn (3), +.BR libsimple_valloc (3), +.BR libsimple_vallocz (3), +.BR libsimple_vvallocn (3), +.BR libsimple_vvalloczn (3) |