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linux-user: Add strace support for printing arguments of chown()/lchown()

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This patch implements strace argument printing functionality for syscalls:

    *chown, lchown - change ownership of a file

        int chown(const char *pathname, uid_t owner, gid_t group)
        int lchown(const char *pathname, uid_t owner, gid_t group)
        man page: https://www.man7.org/linux/man-pages/man2/lchown.2.html

Implementation notes:

    Both syscalls use strings as arguments and thus a separate
    printing function was stated in "strace.list" for them.
    Both syscalls share the same number and types of arguments
    and thus share a same definition in file "syscall.c".
    This defintion uses existing functions "print_string()" to
    print the string argument and "print_raw_param()" to print
    other two arguments that are of basic types.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200619123331.17387-6-filip.bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Filip Bozuta 2020-06-19 14:33:30 +02:00 • committed by Laurent Vivier
parent af861deaed
commit 5844f4bc41
2 changed files with 17 additions and 2 deletions
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15
linux-user/strace.c
View file

@ -1452,6 +1452,21 @@ print_chmod(const struct syscallname *name,
}
#endif
#if defined(TARGET_NR_chown) || defined(TARGET_NR_lchown)
static void
print_chown(const struct syscallname *name,
abi_long arg0, abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4, abi_long arg5)
{
print_syscall_prologue(name);
print_string(arg0, 0);
print_raw_param("%d", arg1, 0);
print_raw_param("%d", arg2, 1);
print_syscall_epilogue(name);
}
#define print_lchown print_chown
#endif
#ifdef TARGET_NR_clock_adjtime
static void
print_clock_adjtime(const struct syscallname *name,

4
linux-user/strace.list
View file

@ -71,7 +71,7 @@
{ TARGET_NR_chmod, "chmod" , NULL, print_chmod, NULL },
#endif
#ifdef TARGET_NR_chown
{ TARGET_NR_chown, "chown" , NULL, NULL, NULL },
{ TARGET_NR_chown, "chown" , NULL, print_chown, NULL },
#endif
#ifdef TARGET_NR_chown32
{ TARGET_NR_chown32, "chown32" , NULL, NULL, NULL },
@ -475,7 +475,7 @@
{ TARGET_NR_kill, "kill", NULL, print_kill, NULL },
#endif
#ifdef TARGET_NR_lchown
{ TARGET_NR_lchown, "lchown" , NULL, NULL, NULL },
{ TARGET_NR_lchown, "lchown" , NULL, print_lchown, NULL },
#endif
#ifdef TARGET_NR_lchown32
{ TARGET_NR_lchown32, "lchown32" , NULL, NULL, NULL },