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Programming
Data segment or Text segment
Post 302518877 by gaurav1086 on Monday 2nd of May 2011 10:02:03 AM
05-02-2011
Quote:
that's why the confusion isThe declaration 'char *a = "hello"' is actually allocated in the .rodata (read-only data) and not in the .text section (in an ELF binary). I wrote a small code to verify
this.
Code:
char *var = "A"; /* small value makes verification easier */
[gaurav@adserver1 ~]$ objdump -s -j .rodata temp.o
temp.o: file format elf32-i386
Contents of section .rodata:
0000 4100 A.
So you see that the value "A" with ascii value '41' is present in there.
Thanks and Regards,
Gaurav.
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LEARN ABOUT ULTRIX
shmat
shmop(2) System Calls Manual shmop(2) Name shmop, shmat, shmdt - shared memory operations Syntax #include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> char *shmat (shmid, shmaddr, shmflg) int shmid; char *shmaddr; int shmflg; int shmdt (shmaddr) char *shmaddr; Description The system call attaches the shared memory segment associated with the shared memory identifier specified by shmid to the data segment of the calling process. The segment is attached at the address specified by one of the following criteria: If shmaddr is equal to zero, the segment is attached at the first available address as selected by the system. If shmaddr is not equal to zero and (shmflg & SHM_RND ) is true, the segment is attached at the address given by (shmaddr- (shmaddr modulus SHMLBA )). If shmaddr is not equal to zero and (shmflg & SHM_RND ) is false, the segment is attached at the address given by shmaddr. The segment is attached for reading if (shmflg & SHM_RDONLY ) is true. Otherwise, it is attached for reading and writing. The system call detaches from the calling process's data segment the shared memory segment located at the address specified by shmaddr. Return Values Upon successful completion, the return values are as follows: o The system call returns the data segment start address of the attached shared memory segment. o The system call returns a value of zero (0). Otherwise, a value of -1 is returned, and errno is set to indicate the error. Diagnostics The system call fails and not attach the shared memory segment, if any of the following is true: [EINVAL] The shmid is not a valid shared memory identifier. [EACCES] Operation permission is denied to the calling process. For further information, see [ENOMEM] The available data space is not large enough to accommodate the shared memory segment. [EINVAL] The shmaddr is not equal to zero, and the value of (shmaddr- (shmaddr modulus SHMLBA )) is an illegal address. [EINVAL] The shmaddr is not equal to zero, (shmflg & SHM_RND ) is false, and the value of shmaddr is an illegal address. [EMFILE] The number of shared memory segments attached to the calling process would exceed the system imposed limit. The fails and does not detach the shared memory segment if: [EINVAL] The shmaddr is not the data segment start address of a shared memory segment. See Also execve(2), exit(2), fork(2), shmctl(2), shmget(2) shmop(2)