The Linux Development Platform Configuring, Using, and ... - Classes

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CH07.fm Page 222 Monday, October 7, 2002 9:12 PM 222 Chapter 7 • Miscellaneous Tools Figure 7-3 The cbrowser window. 7.5 Generating C Function Prototypes from C Source Code Using cproto The cproto utility is used to create function prototypes from C source code files. It can also convert function definition style. The latest version can be downloaded from http://sourceforge.net/ projects/cproto/. At the time of writing this book, version 4.6 is available in source code form. You can download the file, untar it and compile it using the following sequence of commands. tar zxvf cproto-4.6.tar.gz cd cproto-4.6 ./configure make make install
CH07.fm Page 223 Monday, October 7, 2002 9:12 PM Using ltrace and strace Utilities 223 It can read existing C files or take its input from standard input. This utility is not extensively used in C software development but may be useful in some cases. 7.6 Using ltrace and strace Utilities The ltrace program is a tracing utility for library function calls. It runs a program and logs all library function calls by that program. You can also use this utility to log system calls made by a program. The utility can also monitor child processes created by fork() or clone() system calls. This utility is very useful to quickly trace the failure point of an executable program. The utility may also print the time at which a particular function call or system call is executed with a resolution of microseconds. Consider the simple single-line program that prints the string “Hello world” and then exits. Using ltrace with the executable of this program produces the following result. [root@boota ltrace]# ltrace -S -tt ./a.out 22:21:48.325970 SYS_uname(0xbffff3b4) = 0 22:21:48.327037 SYS_brk(NULL) = 0x080495f8 22:21:48.327511 SYS_mmap(0xbffff104, 0xcccccccd, 0x400165f8, 4096, 640) = 0x40017000 22:21:48.328212 SYS_open("/etc/ld.so.preload", 0, 010) = -2 22:21:48.329000 SYS_open("/etc/ld.so.cache", 0, 00) = 3 22:21:48.329657 SYS_197(3, 0xbfffea64, 0, 0xbfffea64, 0) = 0 22:21:48.331719 SYS_mmap(0xbfffea34, 0, 0x400165f8, 1, 3) = 0x40018000 22:21:48.332460 SYS_close(3) = 0 22:21:48.332908 SYS_open("/lib/i686/libc.so.6", 0, 027777765514) = 3 22:21:48.333620 SYS_read(3, "\177ELF\001\001\001", 1024) = 1024 22:21:48.334256 SYS_197(3, 0xbfffeaa4, 3, 0xbfffeaa4, 0) = 0 22:21:48.334917 SYS_mmap(0xbfffe994, 0x0012f728, 0x400165f8, 0xbfffe9c0, 5) = 0x4002c000 22:21:48.335584 SYS_mprotect(0x40152000, 38696, 0, 0x4002c000, 0x00126000) = 0 22:21:48.336209 SYS_mmap(0xbfffe994, 24576, 0x400165f8, 0xbfffe9cc, 3) = 0x40152000 22:21:48.336953 SYS_mmap(0xbfffe994, 0xbfffe9cc, 0x400165f8, 0x40158000, 14120) = 0x40158000 22:21:48.337642 SYS_close(3) = 0 22:21:48.340431 SYS_munmap(0x40018000, 77871) = 0 22:21:48.341060 SYS_getpid() = 32540 22:21:48.341562 __libc_start_main(0x08048460, 1, 0xbffff88c, 0x080482e4, 0x080484c0 22:21:48.342232 __register_frame_info(0x08049508, 0x080495e0, 0xbffff828, 0x0804838e, 0x080482e4) = 0x401575e0 22:21:48.343064 printf("Hello world\n"
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