svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
alloca(3c)
Standard C Library Functions alloca(3C)
NAME
alloca - temporary memory allocator
SYNOPSIS
#include <alloca.h>
void *alloca(size_t size);
DESCRIPTION
The alloca() function allocates size bytes of space in the stack frame
of the caller, and returns a pointer to the allocated block. This tem‐
porary space is automatically freed when the caller returns or calls a
stack frame altering function such as longjmp(3C). If the allocated
block extends beyond the current stack limit, the resulting behavior is
undefined.
RETURN VALUES
Upon successful completion, alloca() returns a pointer to space suit‐
ably aligned (after possible pointer coercion) for storage of any type
of object.
alloca() may return a pointer to memory which causes a stack overflow
if the full block is accessed.
USAGE
Memory allocated by this function may be on pages with the PROT_EXEC
access protections disabled to block execution of machine instructions,
depending on the system settings for NXSTACK in sxadm(8) and any -z
sx=nxstack options that were passed to ld(1) when linking the applica‐
tion. These settings may be overridden for individual pages by calling
mprotect(2).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe
SEE ALSO
brk(2), getrlimit(2), mprotect(2), malloc(3C), pthread_attr_getstack‐
size(2), strdupa(3C), attributes(7)
WARNINGS
The implementation of alloca() is both machine and compiler dependent;
its use is discouraged.
Undefined results will occur if the size requested from a process's
main thread for a block of memory exceeds the maximum size of a
process's stack, which can be obtained with getrlimit(2); or if the
size requested from another thread exceeds the maximum size of the
thread stack, which can be obtained with pthread_attr_getstacksize(2).
Oracle Solaris 11.4 23 Jan 2019 alloca(3C)