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getsegbyname(3) [osx man page]

GETSEGBYNAME(3) 					     Library Functions Manual						   GETSEGBYNAME(3)

NAME
getsegbyname - get the segment command for the named segment SYNOPSIS
#include <mach-o/getsect.h> const struct segment_command *getsegbyname(const char *segname); DESCRIPTION
This routine returns the segment_command structure for the named segment if it exists in the Mach-O (Mach object) executable getsegby- name(3) is linked into. Otherwise getsegbyname(3) returns NULL. It uses the link editor defined symbol _mh_execute_header and just looks through the load commands. Since these are mapped into the __TEXT segment they are read-only and thus const by default. If this is to be used in executables linked with -pie then the value return by the call to _dyld_get_image_vmaddr_slide(0) will need to be added to the vmaddr field of the segment_command struct. SEE ALSO
end(3), getsectbyname(3) Apple, Inc. October 3, 2008 GETSEGBYNAME(3)

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GETSECTBYNAME(3)					     Library Functions Manual						  GETSECTBYNAME(3)

NAME
getsectbyname, getsectdata - get the section information for the named section SYNOPSIS
#include <mach-o/getsect.h> const struct section *getsectbynamefromheader( const struct mach_header *mhp, const char *segname, const char *sectname) const struct section *getsectbyname( const char *segname, const char *sectname) char *getsectdatafromheader( const struct mach_header *mhp, const char *segname, const char *sectname, unsigned long *size) char *getsectdata( const char *segname, const char *sectname, unsigned long *size) char *getsectdatafromFramework( const char *FrameworkName, const char *segname, const char *sectname, unsigned long *size) DESCRIPTION
Getsectbynamefromheader returns the section structure for the named section in the named segment if it exists in the specified Mach header otherwise it returns NULL. If the specified Mach header comes from a dynamic library as returned by _dyld_get_image_header(3) the addr field in the section structure will have to have _dyld_get_image_vmaddr_slide(3) added to it to make it a valid pointer. Getsectbyname is the same as getsectbynamefromheader with its first argument being the link editor defined symbol _mh_execute_header. Getsectdatafromheader returns the address to the data for the named section in the named segment if it exists in the specified Mach header. Also it returns the size of the section data indirectly through the pointer size. Otherwise it returns NULL for the pointer and zero for the size. If the specified Mach header comes from a dynamic library as returned by _dyld_get_image_header(3) the address to the data returned will have to have _dyld_get_image_vmaddr_slide(3) added to it to make it a valid pointer. Getsectdata is the same as getsectdatafromheader with its first argument being the link editor defined symbol _mh_execute_header. getsectdatafromFramework is used to get the named section data from the named Framework. For example, the framework name ``Appkit'' would be used for /System/Library/Frameworks/Appkit.framework/Versions/C/Appkit. If that Framework isn't being used by the program then it returns NULL for the pointer and zero for the size. SEE ALSO
dyld(3), getsegbyname(3) Apple Computer, Inc. April 10, 1998 GETSECTBYNAME(3)
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