1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
21  * Returns 0 on success; -1 on failure.  On sucess, returns via `path` the full
22  * path to the program for pid.
24 int get_pid_binary_path(pid_t pid, char *path, size_t path_sz)  in get_pid_binary_path()  argument
32 		return -1;  in get_pid_binary_path()
34 	ret = readlink(proc_pid_exe, path, path_sz);  in get_pid_binary_path()
37 		return -1;  in get_pid_binary_path()
41 		return -1;  in get_pid_binary_path()
43 	path[ret] = '\0';  in get_pid_binary_path()
49  * Returns 0 on success; -1 on failure.  On success, returns via `path` the full
50  * path to a library matching the name `lib` that is loaded into pid's address
53 int get_pid_lib_path(pid_t pid, const char *lib, char *path, size_t path_sz)  in get_pid_lib_path()  argument
64 		return -1;  in get_pid_lib_path()
69 		return -1;  in get_pid_lib_path()
72 		if (sscanf(line_buf, "%*x-%*x %*s %*x %*s %*u %s", path_buf) != 1)  in get_pid_lib_path()
74 		/* e.g. /usr/lib/x86_64-linux-gnu/libc-2.31.so */  in get_pid_lib_path()
84 		/* libraries can have - or . after the name */  in get_pid_lib_path()
85 		if (*p != '.' && *p != '-')  in get_pid_lib_path()
88 			warn("path size too small\n");  in get_pid_lib_path()
89 			return -1;  in get_pid_lib_path()
91 		strcpy(path, path_buf);  in get_pid_lib_path()
98 	return -1;  in get_pid_lib_path()
102  * Returns 0 on success; -1 on failure.  On success, returns via `path` the full
103  * path to the program.
105 static int which_program(const char *prog, char *path, size_t path_sz)  in which_program()  argument
112 		return -1;  in which_program()
117 		return -1;  in which_program()
119 	if (!fgets(path, path_sz, which)) {  in which_program()
122 		return -1;  in which_program()
125 	path[strlen(path) - 1] = '\0';  in which_program()
131  * Returns 0 on success; -1 on failure.  On success, returns via `path` the full
132  * path to the binary for the given pid.
133  * 1) pid == x, binary == ""    : returns the path to x's program
134  * 2) pid == x, binary == "foo" : returns the path to libfoo linked in x
135  * 3) pid == 0, binary == ""    : failure: need a pid or a binary
136  * 4) pid == 0, binary == "bar" : returns the path to `which bar`
141 int resolve_binary_path(const char *binary, pid_t pid, char *path, size_t path_sz)  in resolve_binary_path()  argument
143 	if (!strcmp(binary, "")) {  in resolve_binary_path()
145 			warn("Uprobes need a pid or a binary\n");  in resolve_binary_path()
146 			return -1;  in resolve_binary_path()
148 		return get_pid_binary_path(pid, path, path_sz);  in resolve_binary_path()
151 		return get_pid_lib_path(pid, binary, path, path_sz);  in resolve_binary_path()
153 	if (which_program(binary, path, path_sz)) {  in resolve_binary_path()
155 		 * If the user is tracing a program by name, we can find it.  in resolve_binary_path()
159 		warn("Can't find %s (Need a PID if this is a library)\n", binary);  in resolve_binary_path()
160 		return -1;  in resolve_binary_path()
166  * Opens an elf at `path` of kind ELF_K_ELF.  Returns NULL on failure.  On
169 Elf *open_elf(const char *path, int *fd_close)  in open_elf()  argument
178 	fd = open(path, O_RDONLY);  in open_elf()
180 		warn("Could not open %s\n", path);  in open_elf()
185 		warn("elf_begin failed: %s\n", elf_errmsg(-1));  in open_elf()
190 		warn("elf kind %d is not ELF_K_ELF\n", elf_kind(e));  in open_elf()
209 		warn("elf_begin failed: %s\n", elf_errmsg(-1));  in open_elf_by_fd()
214 		warn("elf kind %d is not ELF_K_ELF\n", elf_kind(e));  in open_elf_by_fd()
228 /* Returns the offset of a function in the elf file `path`, or -1 on failure. */
229 off_t get_elf_func_offset(const char *path, const char *func)  in get_elf_func_offset()  argument
231 	off_t ret = -1;  in get_elf_func_offset()
232 	int i, fd = -1;  in get_elf_func_offset()
243 	e = open_elf(path, &fd);  in get_elf_func_offset()
255 		if (!(shdr->sh_type == SHT_SYMTAB || shdr->sh_type == SHT_DYNSYM))  in get_elf_func_offset()
260 				n = elf_strptr(e, shdr->sh_link, sym->st_name);  in get_elf_func_offset()
263 				if (GELF_ST_TYPE(sym->st_info) != STT_FUNC)  in get_elf_func_offset()
266 					ret = sym->st_value;  in get_elf_func_offset()
276 			ret = -1;  in get_elf_func_offset()
285 				ret = ret - phdr.p_vaddr + phdr.p_offset;  in get_elf_func_offset()
289 		ret = -1;  in get_elf_func_offset()